Real Economics

There is a good article on the financial crisis and economics in Scientific American. Here are some key tidbits:

The Science of Economic Bubbles and Busts

By Gary Stix

The worst economic crisis since the Great Depression has prompted a reassessment of how financial markets work and how people make decisions about money

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Economists have fought for decades about whether money illusion and, more generally, the influence of irrationality on economic transactions are themselves illusory. Milton Friedman, the renowned monetary theorist, postulated that consumers and employers remain undeluded and, as rational beings, take inflation into account when making purchases or paying wages. In other words, they are good judges of the real value of a good.

But the ideas of behavioral economists, who study the role of psychology in making economic decisions, are gaining increasing attention today, as scientists of many stripes struggle to understand why the world economy fell so hard and fast. And their ideas are bolstered by the brain scientists who make inside-the-skull snapshots of the VMPFC and other brain areas.

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The behavioral ideas now garnering increased attention take exception to some central ideas of modern economic theory, including the view that each buyer and seller constitute an exemplar of Homo economicus, a purely rational being motivated by self-interest. “Under all conditions, man in classical economics is an automaton capable of objective reasoning,” writes financial historian Peter Bernstein.

Another central tenet of the rationalist credo is the efficient-market hypothesis, which holds that all past and current information about a good is reflected in its price—the market reaches an equilibrium point between buyers and sellers at just the “right” price. The only thing that can upset this balance between supply and demand is an outside shock, such as unanticipated price setting by an oil cartel. In this way, the dynamics of the financial system remain in balance. Classical theory dictates that the internal dynamics of the market cannot lead to a feedback cycle in which one price increase begets another, creating a bubble and a later reversal of the cycle that fosters a crippling destabilization of the economy.

A strict interpretation of the efficient-market hypothesis would imply that the risks of a bubble bursting would be reflected in existing market prices—the price of homes and of the risky (subprime) mortgages that were packaged into what are now dubbed “toxic securities.” But if that were so and markets were so efficient, how could prices fall so precipitously? Astonishment about the failure of conventional theory was even expressed by former chair of the Federal Reserve Board Alan Greenspan. A persistent cheerleader for the notion of efficient markets, he told a congressional committee in October 2008: “Those of us who looked to the self-interest of lending institutions to protect shareholder’s equity, myself especially, are in a state of shocked disbelief.”

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A unifying theme of behavioral economics is the often irrational psychological impulses that underlie financial bubbles and the severe downturns that follow. Shiller, a leader in the field, cites “animal spirits”—a phrase originally used by economist John Maynard Keynes—as an explanation. The business cycle, the normal ebbs and peaks of economic activity, depends on a basic sense of trust for both business and consumers to engage one another every day in routine economic dealings. The basis for trust, however, is not always built on rational assessments. Animal spirits—the gut feeling that, yes, this is the time to buy a house or that sleeper stock—drive people to overconfidence and rash decision making during a boom. These feelings can quickly transmute into panic as anxiety rises and the market heads in the other direction. Emotion-driven decision making complements cognitive biases—money illusion’s failure to account for inflation, for instance—that lead to poor investment logic.

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Behavioral economists have identified a number of biases, some with direct relevance to bubble economics. In confirmation bias, people overweight information that confirms their viewpoint. Witness the massive run-up in housing prices as people assumed that rising home prices would be a sure bet. The herding behavior that resulted caused massive numbers of people to share this belief. Availability bias, which can prompt decisions based on the most recent information, is one reason that some newspaper editors shunned using the word “crash” in the fall of 2008 in an unsuccessful attempt to avoid a flat panic. Hindsight bias, the feeling that something was known all along, can be witnessed postcrash: investors, homeowners and economists acknowledged that the signs of a bubble were obvious, despite having actively contributed to the rise in home prices.

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As brain science unravels the roots of investors’ underlying behaviors, it may well find new evidence that the conception of Homo economicus is fundamentally flawed. The rational investor should not care whether she has $10 million and then loses $8 million or, alternatively, whether she has nothing and ends up with $2 million. In either case, the end result is the same.

But behavioral economics experiments routinely show that despite similar outcomes, people (and other primates) hate a loss more than they desire a gain, an evolutionary hand-me-down that encourages organisms to preserve food supplies or to weigh a situation carefully before risking encounters with predators.

One group that does not value perceived losses differently than gains are individuals with autism, a disorder characterized by problems with social interaction. When tested, autistics often demonstrate strict logic when balancing gains and losses, but this seeming rationality may itself denote abnormal behavior.