Saturday, December 24, 2011

12 Μύθοι για την Αγορά

του Αριστείδη Χατζή

Παραπολιτική
24 Δεκεμβρίου 2011

Στο δημόσιο διάλογο ακούει και διαβάζει κανείς πολλές ανοησίες. Μερικές από τις χειρότερες όμως αφορούν τις διαβόητες «Αγορές». Στο συλλογικό φαντασιακό έχουν αναλάβει τον ρόλο του μπαμπούλα που τρομοκρατεί τους πολίτες, τις κυβερνήσεις ακόμα και τους διεθνείς οργανισμούς. Η εικόνα που κυριαρχεί είναι ότι οι Αγορές είναι σαν τα Τρολς, τα μυθικά τέρατα της σκανδιναβικής μυθολογίας: πανίσχυρες, ανορθολογικές, ασύδοτες, κινούνται ανεξέλεγκτα και απρόβλεπτα με ένα μόνο σκοπό, να καταστρέψουν τα πάντα στο πέρασμά τους. Για τους λίγο πιο εύπιστους είναι απαραίτητο και ένα ανθρωπομορφικό στοιχείο - πίσω από τις Αγορές υπάρχουν συγκεκριμένοι άνθρωποι και οργανώσεις που κινούν τα νήματα: η λέσχη Bilderberg, η Τριμερής, οι τραπεζίτες, οι Εβραίοι, οι Αμερικάνοι - τώρα και οι Γερμανοί.

Πάντα οι άνθρωποι προσπαθούσαν να εξηγήσουν φαινόμενα που αδυνατούσαν να κατανοήσουν καταφεύγοντας στη μεταφυσική. Η πολυπλοκότητα ενός κοινωνικού φαινομένου όπως η Αγορά, η άγνοια βασικών οικονομικών εννοιών, η δυσκολία αποδοχής του τυχαίου και η ευκολία αποδοχής απλοϊκών μύθων, η τάση για συνωμοσιολογία και, γιατί να το κρύψουμε άλλωστε, η ευήθεια, οδηγούν αναπόφευκτα σε μεταφυσικού τύπου κατασκευές με κυρίαρχο το ανθρωπομορφικό στοιχείο. Όσο δύσκολο είναι να κατανοήσει ο απλός άνθρωπος το μηχανισμό της Εξέλιξης άλλο τόσο είναι δύσκολο να κατανοήσει τους μηχανισμούς της Αγοράς.

Στο υπόλοιπο αυτού του κειμένου θα προσπαθήσουμε να καταρρίψουμε εν συντομία 12 μύθους για την Αγορά και να απαξιώσουμε τις αντίστοιχες λανθασμένες κυρίαρχες αντιλήψεις.

Μύθος 1: Η Αγορά είναι ένα μυθικό τέρας που μπορεί και να σας φάει ζωντανούς.

Ναι, μη σας φαίνεται υπερβολικό. Για πολλούς ανθρώπους η Αγορά είναι ένα από τα πολλά τέρατα που δεν τους αφήνουν να κοιμηθούν. Φαντάζομαι ότι αν ποτέ κατανοήσουν τι πραγματικά είναι η Αγορά, θα σοκαριστούν: η Αγορά είμαστε εμείς. Εσείς, εγώ, οι φίλοι σας, οι γονείς σας, τα αδέλφια σας, οι συνάδελφοί σας, το αφεντικό σας, ακόμα και οι εχθροί σας. Άτομα, νοικοκυριά, επιχειρήσεις μικρές, μεσαίες και μεγάλες. Οι τράπεζες, οι πολυεθνικές επιχειρήσεις, ο Bill Gates, ο George Soros, ο Νίκος Αλέφαντος, ο Αρχιεπίσκοπος Ιερώνυμος, η Έλενα Παπαρίζου, η κομμώτριά σας, ο μανάβης σας αλλά και ο μπατζανάκης σας. Oι αγορές και οι πωλήσεις, η παραγωγή προϊόντων, η παροχή υπηρεσιών, η κατανάλωση, η ζήτηση και η προσφορά, οι επιθυμίες και οι προτιμήσεις, οι προσδοκίες μας, το ρίσκο, η αβεβαιότητα, οι ζημιές, τα κέρδη, οι ευκαιρίες, οι ιδέες, τα λάθη. Όλες οι αποφάσεις μας, όλες μας οι συνήθειες, το σύνολο σχεδόν της δραστηριότητάς μας αποτελεί μέρος αυτής της Αγοράς.

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Friday, December 23, 2011

The Darwin economy

Robert H. Frank interviewed by Romesh Vaitilingam

Vox
December 23, 2011

Robert Frank of Cornell University talks to Romesh Vaitilingam about his book, "The Darwin Economy: Liberty, Competition and the Common Good." He argues that Charles Darwin's understanding of competition – in which individual and group interests often diverge sharply – describes economic reality far more accurately than Adam Smith's. They discuss the implications of this view for current debates about inequality, taxation, and policies to get out of economic stagnation. The interview was recorded in London in November 2011.


Listen to the Interview

Artistic labour and occupational choice in Baroque painting

by Federico Etro

Vox

December 23, 2011

To some, the world of art and world of economics are diametrically opposed. To others, such as the author of this column, they are part of the same. This column looks at the wages of painters during the 17th century Baroque art movement and asks what insights it can provide for art lovers, economists, and those who consider themselves both.


Exhibit 1. Caravaggio, The Fortune Teller, Paris, Louvre Museum ©

Economists are always on the lookout for new data to test their theories. But rather than sit around itching for the latest surveys or commissioning new randomised trials, researchers might want to dig up what we already have. With a bit of luck, the pages of history can be a rewarding friend. Take for instance the well-documented details of painters in 17th century Italy, at the height of the Baroque age. This is an example of a high-skilled labour market and can provide a fruitful area for study.

One of the most impressive and rapid features of the Baroque art movement was the innovation that led mass productions of new genres of painting – to the economists among us, this is a form of horizontal product differentiation.

Beyond old genres such as figurative paintings (including religious, mythological, and historical subjects) and portraits, the new genres of the Baroque art market included still lifes (reproducing animals, fruits, flowers, and lifeless objects), landscapes (reproducing the countryside or the urban environment), so-called genre paintings (reproducing daily life scenes, as in Exhibit 1 by Caravaggio) and battles (reproducing fights without necessarily a specific historical content). Each genre represented a specific sector of production, and painters either specialised in one or few genres or they could switch between them according to the market opportunities driven by price differentials (think of Caravaggio, who introduced still lifes and genre paintings and yet was often engaged in figurative paintings and portraits).

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United States Ranks 20th in Holiday Spending

National Science Foundation
Press Release 11-269
December 22, 2011


Americans typically spend $70 billion more in December than in the average of November and January (the months around December). In a recent National Science Foundation-sponsored interview, Joel Waldfogel, the Carlson School's Frederick R. Kappel Professor of Applied Economics at the University of Minnesota uses that increase to measure the amount of holiday gift-giving. This level of spending is lower than in other countries. "We're about the 20th largest in terms of countries in the world," said Waldfogel, referencing how much U.S. December spending increases.

Waldfogel is the author of Scroogenomics: Why You Shouldn't Buy Presents for the Holidays. He notes that even though the U.S. economy has grown since the turn of the last century, the amount of U.S. spending in December (relative to November and January) has not kept pace with that growth. The extra spending in December is less as a percentage of Gross Domestic Product than it has been at any time over the last 75 years.

He makes an additional point that the impact of this spending is even smaller if measured by the satisfaction it produces. The reason, he said, is simple: "The problem with gift giving is that somebody is going out and spending $100 on someone else and if the giver does not know exactly what the recipient wants, it is possible for the giver to spend $100 and buy something the recipient would only be willing to pay $50 or perhaps nothing for."

This type of gift giving, said Waldfogel, undermines economically efficient choices. "Whatever amount of spending occurs, it results in less satisfaction than could have occurred if people bought stuff for themselves," which, he claims, results in the loss of billions of dollars in economic value to the overall economy.

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Sunday, December 18, 2011

Reframing the Debate Over Using Phones Behind the Wheel

New York Times
December 17, 2011

For years, policy makers trying to curb distracted driving have compared the problem to drunken driving. The analogy seemed fitting, with drivers weaving down roads and rationalizing behavior that they knew could be deadly.

But on Tuesday, in an emotional call for states to ban all phone use by drivers, the head of a federal agency introduced a new comparison: distracted driving is like smoking.

The shift in language, in comments by Deborah Hersman, the chairwoman of the National Transportation Safety Board, opened a new front in a continuing national conversation about a deadly habit that safety advocates are trying desperately, and with a growing sense of futility, to stop.

Her new tack also echoes a growing consensus among scientists that using phones and computers can be compulsive, both emotionally and physically, which helps explain why drivers may have trouble turning off their devices even if they want to. In effect, they are saying that the running joke about BlackBerrys as “CrackBerrys” is more serious than people think.

“Addiction to these devices is a very good way to think about it,” Ms. Hersman said in an interview. “It’s not unlike smoking. We have to get to a place where it’s not in vogue anymore, where people recognize it’s harmful and there’s a risk and it’s not worth it.”

She added: “If you can’t control your impulses, you need to lock your phone in the trunk.”

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Thursday, December 8, 2011

Jailbreak Rat: Selfless Rodents Spring Their Pals and Share Their Sweets

Scientific American
December 8, 2011

The English language is not especially kind to rats. We say we "smell a rat" when something doesn't feel right, refer to stressful competition as the "rat race," and scorn traitors who "rat on" friends. But rats don't deserve their bad rap. According to a new study in the December 9 issue of Science, rats are surprisingly selfless, consistently breaking friends out of cages—even if freeing their buddies means having to share coveted chocolate. It seems that empathy and self-sacrifice have a greater evolutionary legacy than anyone expected.

In 2007 neuroscientist Peggy Mason of the University of Chicago wrote about the neurobiology of empathy for Scientific American. Inbal Ben-Ami Bartal, a new PhD student in integrative neuroscience who worked across the street from Mason in a different lab, saw the article and proposed a collaboration. "Scientific American really brought us together," Mason says.

In the new study, Mason, Bartal and University of Chicago colleague Jean Decety placed pairs of rats in Plexiglass pens. One rat was trapped in a cage in the middle of the pen, whereas the other rat was free to run around. Most free rats circled their imprisoned peer, gnawing at the cage and sticking their paws, noses and whiskers through any openings. After a week of trial and error, 23 of the 30 rats in the experiment learned to open the cage and free their peers by head-butting the cage door or leaning their full weight against the door until it tipped over. (The door could only be opened from the outside.) At first the rats were startled by the noise of the toppling door. Eventually, however, they stopped showing surprise, which suggests that they fully intended to push the door aside. Further, the rodents showed no interest in opening empty cages or in those containing toy rats, indicating that a break out was their genuine goal.

In this first set of experiments, most rats seemed quite willing to help their peers, but Mason wanted to give them a tougher test. She placed rats in a Plexiglass pen with two cages: in one was another rat, in the other was a pile of five milk chocolate chips—a favorite snack of these particular rodents. The unrestricted rats could easily have eaten the chocolate themselves before freeing their peers or been so distracted by the sweets that they would neglect their imprisoned friends. Instead, most of the rats opened both cages and shared in the chocolate chip feast.

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Tuesday, November 29, 2011

A wise man knows one thing – the limits of his knowledge

by John Kay

Financial Times

November 29, 2011

John Maynard Keynes, who never tried to conceal that he knew more than most people, also knew the limits to his knowledge. He wrote “about these matters – the prospect of a European war, the price of copper 20 years hence – there is no scientific basis on which to form any calculable probability whatever. We simply do not know.”

And Keynes was right. He published these observations in 1921, and 20 years later Britain was engaged in a desperate, and unpredictable, struggle with Germany.

But lesser men find prognostication easier. I have been looking at some of the models people use, in both the public and private sectors to predict events.

The models share a common approach. They pose the question: “How would we make our decision if we had complete knowledge of the world?” With such information you might make a detailed assessment drawing together many different pieces of relevant information on matters such as costs, benefits, and consequences.

But little of this knowledge exists. So you make the missing data up. You assume the future will be like the past, or you extrapolate a trend. Whatever you do, no cell on the spreadsheet may be left unfilled. If necessary, you put a finger in the air.

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Monday, November 21, 2011

The Neuroeconomics Revolution

by Robert J. Shiller

Project Syndicate

November 21, 2011

Economics is at the start of a revolution that is traceable to an unexpected source: medical schools and their research facilities. Neuroscience – the science of how the brain, that physical organ inside one’s head, really works – is beginning to change the way we think about how people make decisions. These findings will inevitably change the way we think about how economies function. In short, we are at the dawn of “neuroeconomics.”

Efforts to link neuroscience to economics have occurred mostly in just the last few years, and the growth of neuroeconomics is still in its early stages. But its nascence follows a pattern: revolutions in science tend to come from completely unexpected places. A field of science can turn barren if no fundamentally new approaches to research are on the horizon. Scholars can become so trapped in their methods – in the language and assumptions of the accepted approach to their discipline – that their research becomes repetitive or trivial.

Then something exciting comes along from someone who was never involved with these methods – some new idea that attracts young scholars and a few iconoclastic old scholars, who are willing to learn a different science and its different research methods. At a certain moment in this process, a scientific revolution is born.

The neuroeconomic revolution has passed some key milestones quite recently, notably the publication last year of neuroscientist Paul Glimcher’s book Foundations of Neuroeconomic Analysis – a pointed variation on the title of Paul Samuelson’s 1947 classic work, Foundations of Economic Analysis, which helped to launch an earlier revolution in economic theory. And Glimcher himself now holds an appointment at New York University’s economics department (he also works at NYU’s Center for Neural Science).

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Monday, November 14, 2011

Ugly People Prejudice

The Daily Show with Jon Stewart
November 14, 2011

Jason Jones reports on the injustices uglo-Americans suffer due to their below-average looks.


Tuesday, November 8, 2011

The Reach of 'Prospect Theory'

The Chronicle of Higher Education
November 8, 2011

Based on thousands of citation records from Thomson Reuters, this chart shows the scholarly influence of "Prospect Theory: An Analysis of Decision Under Risk," written by Daniel Kahneman and Amos Tversky, and published in Econometrica in 1979. The theory has turned up as a reference for an increasing number of journal articles and book chapters (nearly 8,000 items in all), and it has spread into a diverse range of disciplines. Thomson Reuters makes an effort to classify the major scholarship within journals and books into 280 categories; this representation of the paper’s influence condenses these classifications even further.


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Read the Paper

Sunday, November 6, 2011

Thinking, Fast and Slow: Why even experts must rely on intuition and often get it wrong

by William Easterly

Financial Times

November 5, 2011

There have been many good books on human rationality and irrationality, but only one masterpiece. That masterpiece is Daniel Kahneman’s Thinking, Fast and Slow.

Kahneman, a winner of the Nobel Prize for economics, distils a lifetime of research into an encyclopedic coverage of both the surprising miracles and the equally surprising mistakes of our conscious and unconscious thinking. He achieves an even greater miracle by weaving his insights into an engaging narrative that is compulsively readable from beginning to end. My main problem in doing this review was preventing family members and friends from stealing my copy of the book to read it for themselves.

Kahneman presents our thinking process as consisting of two systems. System 1 (Thinking Fast) is unconscious, intuitive and effort-free. System 2 (Thinking Slow) is conscious, uses deductive reasoning and is an awful lot of work. System 2 likes to think it is in charge but it’s really the irrepressible System 1 that runs the show. There is simply too much going on in our lives for System 2 to analyse everything. System 2 has to pick its moments with care; it is “lazy” out of necessity.

Books on this subject tend to emphasise the failings of System 1 intuition, creating an impression of vast human irrationality. Kahneman dislikes the word “irrationality” and one of the signal strengths of Thinking, Fast and Slow is to combine the positive and negative views of intuition into one coherent story. In Kahneman’s words, System 1 is “indeed the origin of much that we do wrong” but it is critical to understand that “it is also the origin of most of what we do right – which is most of what we do”.

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Friday, October 21, 2011

Who You Are

by David Brooks

New York Times

October 20, 2011

Daniel Kahneman spent part of his childhood in Nazi-occupied Paris. Like the other Jews, he had to wear a Star of David on the outside of his clothing. One evening, when he was about 7 years old, he stayed late at a friend’s house, past the 6 p.m. curfew.

He turned his sweater inside out to hide the star and tried to sneak home. A German SS trooper approached him on the street, picked him up and gave him a long, emotional hug. The soldier displayed a photo of his own son, spoke passionately about how much he missed him and gave Kahneman some money as a sentimental present. The whole time Kahneman was terrified that the SS trooper might notice the yellow star peeking out from inside his sweater.

Kahneman finally made it home, convinced that people are complicated and bizarre. He went on to become one of the world’s most influential psychologists and to win the Nobel in economic science.

Kahneman doesn’t actually tell that childhood story in his forthcoming book. Thinking, Fast and Slow is an intellectual memoir, not a personal one. The book is, nonetheless, sure to be a major intellectual event (look for an excerpt in The Times Magazine this Sunday) because it superbly encapsulates Kahneman’s research, and the vast tide of work that has been sparked by it.

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Tuesday, October 11, 2011

Are Children Selfish?

Wall Street Journal
October 11, 2011

To determine the altruistic tendencies of 3-year-olds, scientists gave each of 150 of them six packets of stickers and said they could give some of their stickers to a kid in a room next door. Kevin Helliker has details on Lunch Break.


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'It's Mine!' The Selfish Gene

Wall Street Journal
October 11, 2011

A 3-year-old is handed six sets of colorful stickers.

"You can keep all of them," he is told. "Or you can give some to a child you don't know. He doesn't have any stickers. Do you want to keep all of your stickers? Or do you want to give some to a child you don't know?"

That was the basic script for a study that took place recently in an Israeli playroom which doubled as a social-science laboratory. A child-care-professional-turned-researcher asked 136 children, aged 3 and 4 years old, to step one at a time into the playroom to shed light unwittingly on a hot topic in behavioral science: Are children altruistic?

It seems they are, and part of the explanation may be genetic, according to the study, published last month in the online scientific journal PLoS One. About two-thirds of the children chose to give one or more sets of stickers to an unknown recipient, described to them only as a child who had no stickers. There were no significant differences in generosity between boys and girls.

Among those who declined to share, many had something in common: a variation in a gene, known as AVPR1A, that regulates a hormone in the brain associated with social behaviors. Researchers found that this genetic variant was associated with a significant decrease in willingness to share.

Until recently, only limited research existed on altruism in children, and what it showed was younger children acting less generously. "Younger children appear to weigh costs to the self more than do older children when deciding whether to assist others and are less attuned to the benefits," says a professional guide called the Handbook of Child Psychology.

But young children all along have displayed greater levels of altruism than what most adults might expect. "If parents think that generosity isn't possible at age 2, they won't try to encourage it," says Nancy Eisenberg, an editor of the handbook and an Arizona State University psychology professor.

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Friday, October 7, 2011

How the Dismal Science Stopped Being Dismal

by Justin Fox

New York Times

October 7, 2011

Listen to the economic debates of the past couple of years, and it’s tempting to conclude that no progress has been made in the field in over half a century. There’s John Maynard Keynes on the one side, arguing for deficit spending to offset the aftereffects of a once-in-a-lifetime financial crisis. On the other side there’s Ludwig von Mises (his fellow Austrians Joseph Schumpeter and Friedrich von Hayek seem too moderate for the role), thundering that all govern­ment intervention in the economy is doomed to failure.

Keynes and Mises are of course both long dead. But it is the resilience of their ideas that makes studying the history of economics so rewarding for non­economists. As a rule, economists don’t know much about history. So at times like these, anyone with a bit of familiarity with the giants of the past can weigh in on big economic issues with about as much authority and credibility as the credentialed experts.
Alfred Marshall, in 1892

This is one explanation for the continuing popularity of Robert L. Heilbroner’s book The Worldly Philosophers: The Lives, Times and Ideas of the Great Economic Thinkers. Another is that once a book makes its way onto undergraduate required-­reading lists, as Heilbroner’s did, it doesn’t easily fall off. Heilbroner wrote his irreverent group portrait of Keynes, Schumpeter, Karl Marx, Adam Smith and others in the early 1950s while studying for a doctorate at the New School for Social Research in Manhattan. (Mises was so marginalized at the time he didn’t rate a mention.) He died in 2005, but his book lives on, with more than four million copies sold.

That kind of success makes a tempting target for imitators, and over the past decade, word spread among economics writers that Sylvia Nasar was at work on a new Worldly Philosophers — something to update and possibly supplant Heil­broner. Nasar is no knockoff artist; a professor at Columbia Journalism School and a former economics correspondent for The New York Times, she wrote what is perhaps the best economics-­related book of the past quarter-­century, A Beautiful Mind, a near-perfect biography of the game theorist John Nash.

Now Nasar’s new book, Grand Pursuit: The Story of Economic Genius, is here. As it turns out, it isn’t really a Heilbroner update. For one, it doesn’t make much chronological headway: the postwar giants Paul Samuelson and Milton Friedman get a few pages, as does the philosopher and development economist Amartya Sen, who is still alive and writing books. But the major developments of post-1950 economics are for the most part ignored. So, for that matter, are the major developments of pre-1850 economics. Heilbroner was out to provide an easy-to-digest survey of economic thought through the ages. Nasar has set herself a task at once narrower and more ambitious. She has a story to tell, a story of tragedy, triumph and, as the subtitle says, economic genius.

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Sunday, September 18, 2011

Η τυραννία της ακρασίας

του Χαρίδημου Κ. Τσούκα

Καθημερινή

18 Σεπτεμβρίου 2011

–Μπαμπά, θα χρεοκοπήσουμε;

– Κανείς δεν μπορεί να ξέρει, αλλά θεωρώ ότι είναι μια πολύ πιθανή εξέλιξη.

– Τι σε κάνει να το πιστεύεις αυτό;

– Οι πιο έγκυροι οικονομολόγοι προβλέπουν κάποιας μορφής χρεοκοπία. Χωρίς δραστική αναδιάρθρωση του χρέους, η χώρα δεν σώζεται. Δεν είναι αυτό όμως που με κάνει τόσο απαισιόδοξο όσο η δική μας ακρασία.

– Τι εννοείς;

– «Ακρασία» είναι ένας όρος του Αριστοτέλη για να περιγράψει το φαινόμενο όπου ξέρω τι είναι ορθό να πράξω αλλά δεν το πράττω. «Ο ακρατής πράττει εν γνώσει του άσχημες πράξεις υπό το κράτος του πάθους του» (Ηθικά Νικομάχεια, 1145β 12-13). Ο ακρατής είναι ανίκανος να ζήσει όπως θεωρεί ότι θα έπρεπε.

– Περίεργο δεν είναι αυτό;

– Ναι, το ίδιο έλεγε και ο Σωκράτης. Η υποβέλτιστη πράξη οφείλεται στην άγνοια, όχι στην ακρασία. Για τον Αριστοτέλη, όμως, η ακρασία είναι όχι μόνο υπαρκτή αλλά και επικίνδυνη. Η ακρασία προκύπτει στο μέτρο που το άτομο κυριαρχείται από τα πάθη του, έτσι ώστε να αποκτά ψευδή εικόνα των πεποιθήσεών του. Νομίζει ότι θέλει κάτι (π. χ. να κόψει το τσιγάρο), αλλά δεν το εννοεί.

– Και τι σχέση έχει αυτό με την κρίση που περνάμε;

– Μεγάλη. Η κυβέρνηση δεσμεύεται έναντι των δανειστών της να υλοποιήσει ρηξικέλευθες πολιτικές για τη μείωση του χρέους, αλλά διστάζει να τις υλοποιήσει. Καταφάσκει μεν, συμπεριφέρεται αντιφατικά δε. Τα παραδείγματα, πολλά. Τα προστατευμένα επαγγέλματα δήθεν άνοιξαν. Οι ιδιωτικοποιήσεις συμφωνήθηκαν, αλλά ακόμη περιμένουν. Η εργασιακή εφεδρεία αναβάλλεται διαρκώς. Δεσμευτήκαμε για συγκεκριμένα αποτελέσματα αλλά δεν πασχίζουμε να τα παραγάγουμε. Ο καθηγητής Σταύρος Θωμαδάκης, διακεκριμένος οικονομολόγος, μας έλεγε πρόσφατα στο Πανεπιστήμιο Κύπρου ότι φοβάται default by default! Κινδυνεύουμε να χρεοκοπήσουμε λόγω αδράνειας - γιατί αδυνατούμε να δράσουμε διαφορετικά.

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Friday, September 9, 2011

Rationality, games and conflict

Robert Aumann interviewed by Romesh Vaitilingam

Vox

September 9, 2011

Nobel laureate Robert Aumann of the Hebrew University of Jerusalem talks to Romesh Vaitilingam about his work on ‘rule rationality’, the development of game theory and its potential for understanding conflict – from the Pax Romana to the modern day Middle East. The interview was recorded in August 2011 at the Fourth Lindau Meeting on Economic Sciences, which brought together 17 of the 38 living economics laureates with nearly 400 top young economists from around the world.

Listen to the interview here

Sunday, September 4, 2011

Fourteen magic words that can increase voter turnout by over 10 percentage points??

by Andrew Gelman

The Monkey Cage

September 4, 2011

Christopher Bryan, Gregory Walton, Todd Rogers, and Carol Dweck did two experiments in which they increased people’s voter turnout in real electionsby over 10 percentage points by simply asking them the following survey question on election day:

  • How important is it to you to be a voter in the upcoming election?

In the comparison condition, potential voters were asked:

  • How important is it to you to vote in the upcoming election?

Unfortunately, there doesn’t seem to have been a control condition in the experiments, so all they could really do was compare these two treatments to each other.

The gimmick of the experiment is that it harnesses humans’ natural belief in essentialism (see, for example, reference 14 in the link above), the idea that being “a voter” is more essential than being a person who happened to vote.

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Read the Paper

Saturday, September 3, 2011

Joe Heller (The Green Bay Press-Gazette)

The Sugary Secret of Self-Control

by Steven Pinker

New York Times

September 2, 2011

Ever since Adam and Eve ate the apple, Ulysses had himself tied to the mast, the grasshopper sang while the ant stored food and St. Augustine prayed “Lord make me chaste — but not yet,” individuals have struggled with self-control. In today’s world this virtue is all the more vital, because now that we have largely tamed the scourges of nature, most of our troubles are self-inflicted. We eat, drink, smoke and gamble too much, max out our credit cards, fall into dangerous liaisons and become addicted to heroin, cocaine and e-mail.

Nonetheless, the very idea of self-­control has acquired a musty Victorian odor. The Google Books Ngram Viewer shows that the phrase rose in popularity through the 19th century but began to free fall around 1920 and cratered in the 1960s, the era of doing your own thing, letting it all hang out and taking a walk on the wild side. Your problem was no longer that you were profligate or dissolute, but that you were uptight, repressed, neurotic, obsessive-compulsive or fixated at the anal stage of psychosexual development.

Then a remarkable finding came to light. In experiments beginning in the late 1960s, the psychologist Walter Mischel tormented preschoolers with the agonizing choice of one marshmallow now or two marshmallows 15 minutes from now. When he followed up decades later, he found that the 4-year-olds who waited for two marshmallows turned into adults who were better adjusted, were less likely to abuse drugs, had higher self-esteem, had better relationships, were better at handling stress, obtained higher degrees and earned more money.

What is this mysterious thing called self-control? When we fight an urge, it feels like a strenuous effort, as if there were a homunculus in the head that physically impinged on a persistent antagonist. We speak of exerting will power, of forcing ourselves to go to work, of restraining ourselves and of controlling our temper, as if it were an unruly dog. In recent years the psychologist Roy F. Baumeister has shown that the force metaphor has a kernel of neurobiological reality. In Willpower, he has teamed up with the irreverent New York Times science columnist John Tierney to explain this ingenious research and show how it can enhance our lives.

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Monday, August 22, 2011

Demographic-economic paradox

From Wikipedia

The demographic-economic paradox is the inverse correlation found between wealth and fertility within and between nations. The higher the degree of education and GDP per capita of a human population, subpopulation or social stratum, the fewer children are born in any industrialized country. In a 1974 UN population conference in Bucharest, Karan Singh, a former minister of population in India, illustrated this trend by stating "Development is the best contraceptive."

The term "paradox" comes from the notion that greater means would necessitate the production of more offspring as suggested by the influential Thomas Malthus. Roughly speaking, nations or subpopulations with higher GDP per capita are observed to have fewer children, even though a richer population can support more children. Malthus held that in order to prevent widespread suffering, from famine for example, what he called "moral restraint" (which included abstinence) was required. The demographic-economic paradox suggests that reproductive restraint arises naturally as a consequence of economic progress.

It is hypothesized that the observed trend has come about as a response to increased life expectancy, reduced childhood mortality, improved female literacy and independence, and urbanization that all result from increased GDP per capita, consistent with the demographic transition model.

Current information suggests that the demographic-economic paradox only holds up to a point though. Recent data suggests that once a country reaches a certain level of human development and economic prosperity the fertility rate stabilizes and then recovers slightly to replacement rates.

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Friday, July 1, 2011

The Measure of Human Happiness

by Clive Crook

The Atlantic

July 1, 2011

A theme at many sessions at this year's AIF has been happiness--what it is, how you advance it, how you measure it. Fascinating. Justin Wolfers and Robert Frank had an interesting exchange on this earlier in the week, and I'm continuing to turn their arguments over in my mind.

Wolfers tore into the "Easterlin Paradox", which is the claim that happiness does not rise with income beyond a certain point. That finding (see Richard Easterlin: Does Economic Growth Improve the Human Lot?) gave rise to the popular view that, for rich countries at least, economic growth is a treadmill. People are struggling to improve their status, and feel happier if they succeed, but the race for status goods is zero-sum. Growth in absolute income cannot raise everybody's relative position. It allows higher consumption but expands desires at about the same rate. The gain in happiness, if any, is small. For a rich country, the obsession with growth in GDP is an error.

Wolfers walked through his impressive array of data--derived from a remarkable project of international comparisons undertaken by Gallup--and argued that the Easterlin claim is simply and unambiguously false. Higher incomes make people happier. It takes ever larger increases in absolute income to yield a given improvement in happiness (happiness rises with the log of income), but there is no point of saturation. Within countries, richer people are happier than poor people. Globally, rich countries are happier than poor countries. He examined some of the statistical evidence which is said to point the other way, and showed it was wrong. Economic growth does what it is supposed to.

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Friday, June 24, 2011

The Fear of Reason: In defense of rational argument

by Leon Wieseltier

New Republic
June 23, 2011

“I just want to point out,” declared the student at the far end of the seminar table, “that when Maimonides offers a proof of God’s existence, he is not saying that he has really proved it. What he’s saying is: This works for me, and if it works for you, great.” I was teaching a graduate seminar on The Guide of the Perplexed at a fine American university, and I was pleased to see my students warming to my insistence that the old masterpiece is still alive, and one of the most formidable obstacles ever erected against a thoughtless existence. We returned repeatedly to the question of what medievals can teach moderns about the indispensability of a worldview, and about the proper methods for justifying one. But the young man’s comment about the subjectivism of Maimonides’s proof—anyway the least interesting part of the book--startled me. It was so American and so wrong. After explaining why it was not just historically correct, but also philosophically respectable, to conclude from the text that its author really could have believed that a proof was possible, I proposed that we quit the twelfth century and put a little pressure on the talismanic words “and if it works for you, great.” I began a discussion of the shortcomings of pragmatism, which allowed me to launch into a withering—and of course intellectually devastating—analysis of the ideas of Richard Rorty and their poisonous impact upon thinking in America. My students offered surprisingly little resistance; but then they had signed up for a winter of rationalism and religion--this countercultural band was not ashamed of its interest in the idea of truth. Yet the Rortyan shrug was still there in the young man’s comment, and so I asked him for his opinion about reason. He said that it frightened him and discouraged him. The problem with reason, he explained, was that it claimed to settle matters once and for all, and that this was arrogant, and that it left him with nothing more to say. Rationalism made him feel excluded and late. I replied that he had it backward. It is not reason, but unreason, that shuts things down. You cannot argue against an emotion, but you can argue against an argument. That is why we were still contending with Maimonides, and why he was still contending with Aristotle. A reasoned discussion is always open and a reasoned intervention is always timely. Unreason is more arrogant, more impatient, more cruel, than reason. Since reason is general, it is inclusive. Reason, I said, is strict but fragile, forever hounded, forever distracted, the minority cause, provisional, fair, curious, fallible, public—not tyrannical but heroic, in its lonely insurrection against the happy and popular hegemony of passions and interests. I told my students about Maimonides’s life, the persecution, the tragedy, the depression, the paranoia, so that they would see the creatureliness of the rationalist, and honor his confidence in the mind as a human triumph. Reason is even poignant.

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Thursday, June 9, 2011

Extraverts More Likely to Believe in Free Will

Miller-McCune
June 8, 2011

Philosophers’ views on freedom and moral responsibility are influenced by inherited personality traits. If they can’t be objective, can anyone?

Philosophers are trained to think things through logically and reach conclusions based solely on reason. But as science provides increasing evidence for the interconnectivity of mind, body and emotions, is that sort of intellectual objectivity truly possible?

A newly published study suggests the answer is no — at least when it comes to addressing one fundamental issue. It finds deep thinkers with a specific type of personality — warm and extraverted — are more likely to believe that free will remains a viable concept, even in the light of research suggesting our behavior is largely determined by unconscious impulses.

While this may sound like a theoretical argument, the researchers, led by Eric Schulz of the Max Planck Institute for Human Development in Berlin, argue it has potentially profound implications. If expert opinion is partly a matter of personality, it negates the notion that trained specialists can and do provide cool, clear-minded assessments of the facts — a concept that is at the foundation of our legal system.

“Even highly skilled professionals such as lawyers, judges, ethicists and philosophers may not be immune to the influence of their different personalities,” they write in the journal Consciousness and Cognition. One could easily add other experts to that list, including economists, sociologists — and journalists.

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Friday, June 3, 2011

Rational After All: Toward an Improved Theory of Rationality in Economics

by Yulie Foka-Kavalieraki and Aristides N. Hatzis

Revue de Philosophie Economique
Vol. 12, No. 1, June 2011

In this paper we critically review the literature on rational choice theory (RCT) and the critical approaches to it. We will present a concise description of the theory as defended by Gary Becker, Richard Posner and James Coleman (as well as others) at the University of Chicago from the mid-1970s to the early 1990s, we will discuss its epistemological assumptions and predictions and we will also examine the most important arguments against it. We will give our main emphasis on the critique coming from behavioral economics and we will try to see if humans’ supposed cognitive constraints lead to a failure of rationality or if they constitute rational responses to the scarcity of information, time and energy. In our discussion we will use findings from experimental economics and the sciences of the brain, especially evolutionary psychology and neuroeconomics. Our intention is to present an improved theory of rational choice that, informed from the above discussion, will be descriptively more accurate but without losing its predicting power. Moreover, we will conclude by trying to answer the most important related policy question: when rationality seems to fail, does this necessarily imply that agents should be paternalistically protected against themselves? We will briefly defend the thesis that, in the long-run, it is much better for them and the society at large for the individual decision makers to be let alone to develop rational responses to their cognitive constraints.

Keywords: Rational Choice Theory, Behavioral Economics, Evolutionary Psychology, Rationality, Cognition, Paternalism

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On ‘Jeopardy!’ Women Take Fewer Risks vs. Men

Miller-McCune
June 2, 2011

A study of contestant behavior on the popular game show “Jeopardy!” suggests women tend to hedge their bets when facing male opponents.

The answer is: It’s a game show that provides surprising clues about sex, social rules and risk-taking.

And the question is: What is Jeopardy!?

Two Swedish researchers, writing in the journal Economics Letters, report an intriguing pattern of behavior by contestants on the popular quiz program. Women, it seems, take fewer risks when their Jeopardy! opponents are men.

Gabriella Sjogren Lindquist and Jenny Save-Soderbergh of the Swedish Institute for Social Research looked at 206 episodes of Jeopardy!, focusing on those moments when one of the three contestants must decide how much to wage on a Daily Double.

For those unfamiliar with the Jeopardy!, Daily Doubles pop up at random during the course of play. Rather than wagering a set amount on whether they will know the answer to a question (the show’s usual format), contestants are given the opportunity to bet as much or as little as they like, up to the amount of money they have accumulated to that point.

The researchers tallied the results of 615 Daily Doubles, featuring 251 male and 65 female contestants. (The same contestant can play several Daily Doubles during the course of the show, and still more if he or she wins and returns the next day.)

The researchers found “no systemic gender differences in performance,” either on the Daily Double questions or the final scores. But they also determined that “male players are more likely to give the correct answer when competing against males only.” Perhaps man-to-man competition, which played a vital role in our evolutionary past, sharpens the male mind.

Most intriguingly, the researchers found females “apply a more conservative wagering strategy” when their two opponents are both male. Compared to instances when they’re up against two women, or a man and a woman, “Women wager 25 percent less of their accumulated score on average” when they’re competing against two men.

“Men do not display this behavior,” they add.

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Thursday, June 2, 2011

"Athene's theory of everything"....


Αν και αμφίβολης αποδοχής του συγκεκριμένου "ερευνητή" από την επιστημονική κοινότητα, το βιντεάκι αυτό έχει προκαλέσει αρκετό ντόρο στο διαδίκτυο. Πρόκειται για τον Chiren Boumaaza γνωστό και ως Athena (έμαθα ότι έχει υπάρξει δεινός και "ανίκητος" παίχτης του world of warcraft προτού εξαφανιστεί από την ιντερνετική αυτή κοινότητα για να αφοσιωθεί πλήρως στη συγκεκριμένη έρευνα). Υπάρχει και σχετικό blog: athenism.net το οποίο συστήνεται ως "scientific research & self-development activism".

Αναφέρεται σε Einstein's theory of relativity, quantum mechanics & consciousness, neurons, Joseph E. LeDoux, De Broglie equasion κ.α.... και υποστηρίζει ότι "δεν μπορεί να υπάρξει "ελεύθερη επιλογή" ενόσω είμαστε συναισθηματικά συνδεδεμένοι σε ένα σύστημα ιδεών (belief system). Το ερώτημα δεν είναι αν τα πιστεύω μας είναι σωστά ή λάθος αλλά αν το να είμαστε συναισθηματικά δεμένοι με αυτά μπορεί ή όχι να μας ωφελήσει....."

Ο λόγος που το αναρτώ είναι κάποια επιχειρήματά του που αν και δεν έχουν επαληθευτεί, ίσως να γίνουν τροφή για σκέψη για κάποιους από εμάς. Κυρίως όμως με προβλημάτισε το εξής σχετικά με την ίδια την ύπαρξη αυτού του video: Ένας επιστήμονας ερευνητής με αντικείμενο που από τη φύση του προκαλεί πολύ ενδιαφέρον και αντιπαραθέσεις, δημοσιεύει στο ευρύ κοινό (δηλ. όχι ακαδημαϊκή/επιστημονική κοινότητα) τις υποθέσεις ή τα μη επαληθεύσιμα (ακόμα ίσως) επιχειρήματα και συμπεράσματά του (έστω και αν η δημοσίευση γίνει μέσω τρίτου, όπως εν προκειμένω); και αν το κάνει, αυτό γίνεται για να προκληθεί ντόρος ή μήπως πλέον σήμερα η επιστήμη και η διαδικασία της έρευνας (υπόθεση, πείραμα, επιχείρημα, επαλήθευση κλπ) γίνονται "ανοιχτές" και στο μη ακαδημαϊκό κοινό (κυρίως με τη βοήθεια του internet); Τί κινδύνους ή ωφέλειες μπορεί αυτό να σημαίνει;;

Για όσους δεν διαθέτουν πολύ χρόνο να το δουν, προτείνω τα 7:30'...12'...21'...25'...42:40'...44'...47'....

Monday, May 30, 2011

DSK and Conspiracy Theory

by Roger Cohen

New York Times

May 30, 2011

After Osama bin Laden was killed, a prominent French radio station called me for an interview. It turned into a mildly hallucinogenic experience. Everybody from the president of the United States to Al Qaeda itself was saying Bin Laden was dead, but my interviewer kept pressing me for “the proof.”

I talked about DNA samples, the word of the American president, the accumulated intelligence, but it was clear that a Gallic conspiracy reflex — especially active with regard to France’s sometime American savior — had kicked in. The view that this might all be some U.S. plot or hoax had taken mysterious hold.

I was put in mind of an unpleasant Paris dinner when a France Télécom manager with international experience began to expound on the theory — more than plausible to his mind — that Jews had not turned up to work at the twin towers on 9/11 because Israel and the Mossad were behind the planes-turned-missiles that turned lower Manhattan into an inferno.

And now we have the Dominique Strauss-Kahn sexual assault case, viewed, it seems, by close to 60 percent of French society as a conspiracy against the putative Socialist presidential candidate — a sting operation that somehow placed a West African immigrant maid in a $3,000 a night Sofitel suite whose number, 2806, corresponds to the date of the opening of the Socialist party primaries in France (06-28).

Oh, s’il vous please!

A rough rule goes like this: The freer a society the less inclined it is to conspiracy theories, while the greater its culture of dependency the more it will tend to see hidden hands at work everywhere.

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Sunday, May 29, 2011

The Ellsberg Paradox

Ο νευροοικονομολόγος Colin Camerer εξηγεί το το Παράδοξο του Ellsberg και τους λόγους για τους οποίους τα άτομα επιλέγουν το βέβαιο αν και ασυνεπές.


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Saturday, May 28, 2011

Dan Dennett: Cute, sexy, sweet, funny

TED
February 2009

Why are babies cute? Why is cake sweet? Philosopher Dan Dennett has answers you wouldn't expect, as he shares evolution's counterintuitive reasoning on cute, sweet and sexy things (plus a new theory from Matthew Hurley on why jokes are funny).

Philosopher and scientist Dan Dennett argues that human consciousness and free will are the result of physical processes and are not what we traditionally think they are. His 2003 book Freedom Evolves explores the way our brains have evolved to give us -- and only us -- the kind of freedom that matters, while 2006's Breaking the Spell examines religious belief through the lens of biology.

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The Optimism Bias

by Tali Sharot

Time

May 28, 2011

We like to think of ourselves as rational creatures. We watch our backs, weigh the odds, pack an umbrella. But both neuroscience and social science suggest that we are more optimistic than realistic. On average, we expect things to turn out better than they wind up being. People hugely underestimate their chances of getting divorced, losing their job or being diagnosed with cancer; expect their children to be extraordinarily gifted; envision themselves achieving more than their peers; and overestimate their likely life span (sometimes by 20 years or more).

The belief that the future will be much better than the past and present is known as the optimism bias. It abides in every race, region and socioeconomic bracket. Schoolchildren playing when-I-grow-up are rampant optimists, but so are grownups: a 2005 study found that adults over 60 are just as likely to see the glass half full as young adults.

You might expect optimism to erode under the tide of news about violent conflicts, high unemployment, tornadoes and floods and all the threats and failures that shape human life. Collectively we can grow pessimistic — about the direction of our country or the ability of our leaders to improve education and reduce crime. But private optimism, about our personal future, remains incredibly resilient. A survey conducted in 2007 found that while 70% thought families in general were less successful than in their parents' day, 76% of respondents were optimistic about the future of their own family.

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Thursday, May 26, 2011

Sex, Lies, Arrogance: What Makes Powerful Men Act Like Pigs*

Time
May 19, 2011

When her husband Dominique Strauss-Kahn was preparing to run for President of France five years ago, Anne Sinclair told a Paris newspaper that she was "rather proud" of his reputation as a ladies' man, a chaud lapin (hot rabbit) nicknamed the Great Seducer.

"It's important," she said, "for a man in politics to be able to seduce."

Maybe it was pride that inspired French politicians and International Monetary Fund officials to look the other way as the rumors about "DSK" piled up, from the young journalist who says Strauss-Kahn tried to rip off her clothes when she went to interview him, to the female lawmaker who describes being groped and pawed and vowed never to be in a room alone with him again, to the economist who argued in a letter to IMF investigators that "I fear that this man has a problem that, perhaps, made him unfit to lead an institution where women work under his command." Maybe it was the moral laziness and social coziness that impel elites to protect their own. Maybe it was a belief that he alone could save the global economy. Maybe nothing short of jail is disqualifying for certain men in certain circles.

But in any event, the arrest of Strauss-Kahn in New York City for allegedly trying to rape a hotel maid has ignited a fierce debate over sex, law, power and privilege. And it is only just beginning. The night of Strauss-Kahn's arraignment, former California governor Arnold Schwarzenegger admitted that the reason his wife Maria Shriver walked out earlier this year was the discovery that he had fathered a child more than a decade ago with a former member of the household staff. The two cases are far apart: only one man was hauled off to jail. But both suggest an abuse of power and a betrayal of trust. And both involve men whose long-standing reputations for behaving badly toward women did not derail their rise to power. Which raises the question: How can it be, in this ostensibly enlightened age, when men and women live and work as peers and are schooled regularly in what conduct is acceptable and what is actionable, that anyone with so little judgment, so little honor, could rise to such heights?

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Friday, May 20, 2011

Olle Johansson (Sweden)

Make My Bed? But You Say the World’s Ending

New York Times
May 19, 2011

The Haddad children of Middletown, Md., have a lot on their minds: school projects, SATs, weekend parties. And parents who believe the earth will begin to self-destruct on Saturday.

The three teenagers have been struggling to make sense of their shifting world, which started changing nearly two years ago when their mother, Abby Haddad Carson, left her job as a nurse to “sound the trumpet” on mission trips with her husband, Robert, handing out tracts. They stopped working on their house and saving for college.

Last weekend, the family traveled to New York, the parents dragging their reluctant children through a Manhattan street fair in a final effort to spread the word.

“My mom has told me directly that I’m not going to get into heaven,” Grace Haddad, 16, said. “At first it was really upsetting, but it’s what she honestly believes.”

Thousands of people around the country have spent the last few days taking to the streets and saying final goodbyes before Saturday, Judgment Day, when they expect to be absorbed into heaven in a process known as the rapture. Nonbelievers, they hold, will be left behind to perish along with the world over the next five months.

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Tuesday, May 17, 2011

A New Gauge to See What’s Beyond Happiness

by John Tierney

New York Times

May 16, 2011

Is happiness overrated?

Martin Seligman now thinks so, which may seem like an odd position for the founder of the positive psychology movement. As president of the American Pyschological Association in the late 1990s, he criticized his colleagues for focusing relentlessly on mental illness and other problems. He prodded them to study life’s joys, and wrote a best seller in 2002 titled Authentic Happiness.

But now he regrets that title. As the investigation of happiness proceeded, Dr. Seligman began seeing certain limitations of the concept. Why did couples go on having children even though the data clearly showed that parents are less happy than childless couples? Why did billionaires desperately seek more money even when there was nothing they wanted to do with it?

And why did some people keep joylessly playing bridge? Dr. Seligman, an avid player himself, kept noticing them at tournaments. They never smiled, not even when they won. They didn’t play to make money or make friends.

They didn’t savor that feeling of total engagement in a task that psychologists call flow. They didn’t take aesthetic satisfaction in playing a hand cleverly and “winning pretty.” They were quite willing to win ugly, sometimes even when that meant cheating.

“They wanted to win for its own sake, even if it brought no positive emotion,” says Dr. Seligman, a professor of psychology at the University of Pennsylvania. “They were like hedge fund managers who just want to accumulate money and toys for their own sake. Watching them play, seeing them cheat, it kept hitting me that accomplishment is a human desiderata in itself.”

This feeling of accomplishment contributes to what the ancient Greeks called eudaimonia, which roughly translates to “well-being” or “flourishing,” a concept that Dr. Seligman has borrowed for the title of his new book, Flourish. He has also created his own acronym, Perma, for what he defines as the five crucial elements of well-being, each pursued for its own sake: positive emotion, engagement (the feeling of being lost in a task), relationships, meaning and accomplishment.

“Well-being cannot exist just in your own head,” he writes. “Well-being is a combination of feeling good as well as actually having meaning, good relationships and accomplishment.”

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Monday, May 16, 2011

Attractive People Mate More Often

Το άρθρο που ακολουθεί έχει δημοσιευθεί στο επιστημονικό περιοδικό Journal of Ethology.

"Physical attractiveness influences reproductive success of modern men"
by P. Prokop and Peter Fedor

Abstract

Theory suggests that reproductive success is positively associated with an individual’s genetic quality. However, the association between physical attractiveness and reproductive success (i.e., number of offspring) in modern humans remains less clear. Here we examined associations between men’s reproductive success and physical attractiveness from retrospective data obtained from married, divorced, and single samples of Slovakian men. As predicted, facially more attractive and taller men were more likely to engage in marriage. In turn, married men had higher reproductive success than single men. Even when men’s marital status was considered, facially more attractive men had higher reproductive success than their less attractive counterparts. This supports the importance of physical attractiveness in sexual selection in modern humans.

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Tuesday, May 10, 2011

The Tricky Chemistry of Attraction

by Shirley S. Wang

Wall Street Journal

May 9, 2011

Much of the attraction between the sexes is chemistry. New studies suggest that when women use hormonal contraceptives, such as birth-control pills, it disrupts some of these chemical signals, affecting their attractiveness to men and women's own preferences for romantic partners.

The type of man a woman is drawn to is known to change during her monthly cycle—when a woman is fertile, for instance, she might look for a man with more masculine features. Taking the pill or another type of hormonal contraceptive upends this natural dynamic, making less-masculine men seem more attractive, according to a small but growing body of evidence. The findings have led researchers to wonder about the implications for partner choice, relationship quality and even the health of the children produced by these partnerships.

Evolutionary psychologists and biologists have long been interested in factors that lead to people's choice of mates. One influential study in the 1990s, dubbed the T-shirt study, asked women about their attraction to members of the opposite sex by smelling the men's T-shirts. The findings showed that humans, like many other animals, transmit and recognize information pertinent to sexual attraction through chemical odors known as pheromones.

The study also showed that women seemed to prefer the scents of men whose immune systems were most different from the women's own immune-system genes known as MHC. The family of genes permit a person's body to recognize which bacteria are foreign invaders and to provide protection from those bugs. Evolutionarily, scientists believe, children should be healthier if their parents' MHC genes vary, because the offspring will be protected from more pathogens.

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