by Robert Shiller in Newsweek
When it comes to market bubbles and how they are created, very little, if anything, has changed. This is because human psychology has not changed. Massive bubbles are created when large numbers of people buy into "new era" stories that exaggerate how much the world has improved. For example, in the past few years the global equities and housing bubbles were driven by a giddy faith that world markets were on a tear and prices would go up indefinitely. Our animal spirits are sparked by these tales; we find them irresistible. And since as animals we're also given to a herd mentality, in a bubble we tend to invest too much in the most popular stories—and continue to do so even after the bubble bursts.
As I wrote in my book irrational exuberance in 2000, one of the key stories of our time is the triumph of capitalism. This theme was underscored by the disintegration of the Soviet Union and China's shift to a market economy. But many true believers got the details wrong—and became convinced, for example, that capitalism means market prices will always go up.
In the several decades since the worldwide rise of market economies, our perceptions of ourselves have changed greatly—while young people back then might have become hippies, deeply skeptical of business, today's young people are very concerned with making money. They might have temporarily questioned the idea of capitalism after the financial crisis, but quickly shrugged off their qualms. People still largely believe in the ownership society and in markets. They believe in the importance of doing business, and they generally believe that we all have a responsibility to take care of ourselves. So much for the idea that we're all socialists now; while many countries do take care of society's losers to a significant extent, we don't idealize doing so, as we once did. And this unadulterated belief in capitalism helped to fuel the bubbles that led to the crash.
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Showing posts with label behavioral economics. Show all posts
Showing posts with label behavioral economics. Show all posts
Wednesday, December 30, 2009
Thursday, November 5, 2009
Yale Q6 Fall 2009 Q&A with Dr. Shiller
Decades of economic research have assumed people pursue their goals in a rational manner, discounting the effects of emotion, bias, error, and other irrational forces. Robert Shiller argues that economists need to take a closer look at how people make decisions.
Q: How important is it to understand what people are thinking and feeling when you are trying to understand the economy as a whole?
That's been a controversial question in economics for a long time. Milton Friedman wrote a collection of essays in 1953 called Essays in Positive Economics, in which he argued that you shouldn't try to infer what people are thinking because people really can't tell you what they're thinking. If you ask people why they did something, they will give you a conventional answer or mislead you. The idea was that the essence of economics is to look at the constraints that people have and assume that people are behaving rationally, subject to those constraints, and interpret economic data as reflecting that rational behavior. That is the defining characteristic of economics as a discipline — as opposed to psychology as a discipline — that, in understanding something as massive as the economy, it's best to look at people's actions, not their ostensible reasons. There is some appeal to that. I just wish it were more right.
I can get enthusiastic talking about this theory because, in some respects, it is good. To give an example, suppose you are trying to understand the seasonality of food prices — why they go up in the winter and down in the summer. Well, it's pretty obvious that it has something to do with the weather as a constraint, but you better think it through, because we live in a global economy, and when it's winter up here, it's summer down south. Obviously they'll ship food from one hemisphere to another. That puts a limit on seasonality. This is pure economics, and I'm sure it's right, because the seasons occur year after year after year, and you have people whose job is to ship fruits and vegetables and food around. They're going to find the best pattern of shipping, given all the costs. It wouldn't make a lot of sense to ignore that. Thinking that people get emotional in the summer, or something like that, would probably be wrong.
Q: How important is it to understand what people are thinking and feeling when you are trying to understand the economy as a whole?
That's been a controversial question in economics for a long time. Milton Friedman wrote a collection of essays in 1953 called Essays in Positive Economics, in which he argued that you shouldn't try to infer what people are thinking because people really can't tell you what they're thinking. If you ask people why they did something, they will give you a conventional answer or mislead you. The idea was that the essence of economics is to look at the constraints that people have and assume that people are behaving rationally, subject to those constraints, and interpret economic data as reflecting that rational behavior. That is the defining characteristic of economics as a discipline — as opposed to psychology as a discipline — that, in understanding something as massive as the economy, it's best to look at people's actions, not their ostensible reasons. There is some appeal to that. I just wish it were more right.
I can get enthusiastic talking about this theory because, in some respects, it is good. To give an example, suppose you are trying to understand the seasonality of food prices — why they go up in the winter and down in the summer. Well, it's pretty obvious that it has something to do with the weather as a constraint, but you better think it through, because we live in a global economy, and when it's winter up here, it's summer down south. Obviously they'll ship food from one hemisphere to another. That puts a limit on seasonality. This is pure economics, and I'm sure it's right, because the seasons occur year after year after year, and you have people whose job is to ship fruits and vegetables and food around. They're going to find the best pattern of shipping, given all the costs. It wouldn't make a lot of sense to ignore that. Thinking that people get emotional in the summer, or something like that, would probably be wrong.
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