Heterodoxy and Conventional Wisdom in Economics

A fascinating article in The Nation by Christopher Hayes examines how "mainstream" (or "neoclassical") economics marginalizes challenges to our conventional wisdom:

Mafia is probably a tad hyperbolic, but there is undoubtedly something of a code of omertà within the discipline. Just ask Alan Blinder and David Card. Blinder, a renowned Princeton economist and former Clinton economic adviser, has long been a zealous advocate of trade liberalization. But this past March, the Wall Street Journal ran a front-page article on Blinder's concerns about the massive dislocations that the current trade regime and outsourcing trends might bring for American workers. He suddenly found himself under fire from fellow economists for stepping out of line. Card, a highly esteemed economist at the University of California, Berkeley, caught flak for his heresy not on trade but on the minimum wage. In 1994 he conducted a study to see whether an increase in the minimum wage in New Jersey had the negative effect on employment that basic neoclassical theory would predict. He found it didn't. In fact, his regression analysis showed that, controlling for other factors, New Jersey gained fast-food jobs after increasing its minimum wage, compared with Pennsylvania, which hadn't raised wages. The paper attracted a tremendous amount of attention and criticism, and Card himself largely abandoned working on the minimum wage. In a 2006 interview, he explained his decision to leave the topic behind this way: "I've subsequently stayed away from the minimum wage literature for a number of reasons. First, it cost me a lot of friends. People that I had known for many years, for instance, some of the ones I met at my first job at the University of Chicago, became very angry or disappointed. They thought that in publishing our work we were being traitors to the cause of economics as a whole."

As Card's and Blinder's experiences show, the "mafia" still flexes its muscles, but there are also signs that its hold on power is slipping. While the discipline remains dominated by a "neoclassical" consensus that is generally pro-market and suspicious of government intervention, an explosion of new research programs and methods have provided strong evidence that many of the pillars of that consensus rest on a foundation of sand. In fact, just before the reception, AEA president George Akerlof, a Nobel laureate as respected in the profession as they come, gave what was in many senses a radical address, attacking some of the discipline's most basic assumptions about what drives human economic behavior. (Three men standing near me in the Friedman reception had referred to it as "crap.")

Much of the article is devoted to the state of non-mainstream schools of economic thought. At a place like Miami, you may not learn much about these marginalized heterodox economists. Who are they?

...Heterodox economists... are economists who don't "think like economists." Many point out that humans aren't rational, or not nearly as rational as the theory would have them be (and, further, that in the aggregate this creates market failures). Others point out that humans are social creatures, not individual agents, and their preferences and behaviors are forged by social structures: institutions, habits, social mores and culture all mediate and drive economic behavior. Others say that price and value aren't interchangeable and that prices don't arise from the simple intersection of supply and demand curves, while some argue that unequal power between different sectors of society affects how markets operate. Dissent from the mainstream of economics is not new; indeed, it's nearly as old as the profession itself. Marx was a kind of heterodox economist, as was Thorstein Veblen.

On his blog, Dani Rodrik has (as always) a thoughtful response:

Hayes makes a number of good points about how ideology permeates a lot of thinking by orthodox economists. Anybody who strays from conventional wisdom is in danger of being ostracized. Some years ago, when I first presented an empirical paper questioning some of the conventional views on trade to a high profile economics conference, a member of the audience (a very prominent economist and a former co-author of mine) shocked me with the question "why are you doing this?"

On the other hand I have never found neoclassical methodology too constraining when it comes to thinking about the real world in novel and unconventional ways. See the Carlos Diaz-Alejandro rule here. To me it represents nothing other than a methodological predilection for deriving aggregate social phenomena from individual behavior--and as such it is a very useful discipline for any social science. You say people have some preferences, they face certain constraints, take others' actions into account, and go from there. Neoclassical economics teaches you how to think, not what to think.

I agree, though it is continually frustrating to see so many economists, and students of economics, thoughtlessly use (abuse) conclusions derived from assumptions of perfect competition and perfect information as cover for libertarian "free market" ideology. Smart economists like Rodrik recognize that we live in an imperfect competition/imperfect information world (and neoclassical tools can be useful in understanding it). Advice to students: don't leave college without reading Marx, Veblen and Galbraith (who coined the phrase "conventional wisdom").