In a bubble, eventually people start saying, 'Wait a minute... these prices are way too high! What is anyone buying anymore? What could they possibly be thinking?' And then there's a correction and a bursting.

Fifty years ago or a hundred years ago, generally, most people would buy a house the way you buy a car. When you buy a car, do you think, 'I better buy this year rather than next year because car prices might go up?'

Speculative markets have always been vulnerable to illusion. But seeing the folly in markets provides no clear advantage in forecasting outcomes, because changes in the force of the illusion are difficult to predict.

Yes, horoscopes still persist in popular newspapers, but they are there only for the severely scientifically challenged, or for entertainment; the idea that the stars determine our fate has lost all intellectual currency.

Physicists have a bias to aspire to be "seers" like Einstein rather than "craftspeople" who do simple and practical research. I have seen that in economics departments. The same must be true to some extent in other departments.

The desperately poor may accept handouts, because they feel they have to. For those who consider themselves at least middle class, however, anything that smacks of a handout is not desired. Instead, they want their economic power back.

If I was counselling an individual, and my purpose was to help that individual, the most important thing would be that you should save more. Because don't expect that your retirement will follow those trajectories that some advisers are telling you.

Hesitation is often like procrastination. One may have vague doubts and feel a need to mull things over; meanwhile, other issues intrude on thought, and no decision is taken. Ask people why they procrastinate, and you probably won't get a crisp answer.

Fear causes individuals to restrain their spending and firms to withhold investments; as a result, the economy weakens, confirming their fear and leading them to restrain spending further. The downturn deepens, and a vicious circle of despair takes hold.

The good news is that, at least in economics, I've seen movement away from its overemphasis on mathematical models of purely rational behavior to a more eclectic and commonsense approach: research that is, among other things, more respectful of insights from psychology.

If we wait until income inequality is much more severe, we will have a whole class of new superrich who will probably feel entitled to their wealth and will have the means to defend their interest. That's already gone far enough. We shouldn't let it become more extreme.

Housing traditionally is not viewed as a great investment. It takes maintenance; it depreciates. It goes out of style. All of those are problems. And there's technical progress in housing. So, new ones are better. So, why was it considered an investment? That was a fad.

Economists who adhere to rational-expectations models of the world will never admit it, but a lot of what happens in markets is driven by pure stupidity - or, rather, inattention, misinformation about fundamentals, and an exaggerated focus on currently circulating stories.

As a child, I was fascinated by any branch of physical or biological science. Even today, I find great excitement in discovering the complexity and variability of the world we live in, getting a glimpse into the deeper reality that we mostly ignore in our everyday human activities.

What would be better, that people build big houses thinking that they'll make capital gains or that they send their children to medical school and they do research on curing diseases? When you put it that way, it seems obvious. There has developed a sense of personal worth that's tied to one's house.

A moderate tax on robots, even a temporary tax that merely slows the adoption of disruptive technology, seems a natural component of a policy to address rising inequality. Revenue could be targeted toward wage insurance, to help people replaced by new technology make the transition to a different career.

Stock prices are likely to be among the prices that are relatively vulnerable to purely social movements because there is no accepted theory by which to understand the worth of stocks....investors have no model or at best a very incomplete model of behavior of prices, dividend, or earnings, of speculative assets.

All taxes, except a 'lump-sum tax,' introduce distortions in the economy. But no government can impose a lump-sum tax - the same amount for everyone regardless of their income or expenditures - because it would fall heaviest on those with less income, and it would grind the poor, who might be unable to pay it at all.

Trump's victory clearly appears to stem from a sense of economic powerlessness, or a fear of losing power, among his supporters. To them, his simple slogan, 'Make America great again,' sounds like 'Make You great again': economic power will be given to the multitudes without taking anything away from the already successful.

Since the global financial crisis and recession of 2007-2009, criticism of the economics profession has intensified. The failure of all but a few professional economists to forecast the episode - the aftereffects of which still linger - has led many to question whether the economics profession contributes anything significant to society.

I think that a lot of people in all walks of life have the impression, of course, that, 'I specialize in something. I can't - I don't have the time to read other things. I'll just go to pure entertainment when I'm relaxing, and then I'll come back to my pure specialty.' That produces - that attitude produces idiot savants, unfortunately.

I want to know diverse facts about such things as galaxies or molecules or proteins or insect species. I have an impulse to want to know the little details, which are usually of no significance to non-specialists. I own a dissection microscope, and if there is an insect in the house, I sometimes catch it and look at it under the microscope.

Those on the downside of rising economic inequality generally do not want government policies that look like handouts. They typically do not want the government to make the tax system more progressive, to impose punishing taxes on the rich, in order to give the money to them. Redistribution feels demeaning. It feels like being labeled a failure.

My clinical psychologist wife of 40 years has always had a close intellectual influence on me. When I was beginning to talk openly in the economics profession about irrationality in decision-making, I received a lot of criticism. Ginny would support my views and remind me that a whole other profession - psychology - studies people's irrational sides.

As I write in 2012 we certainly do not believe that it is over yet, and the worst may be yet to come. Efforts by governments to solve the underlying problems responsible for the crisis have still not gotten very far, and the 'stress tests' that governments have used to encourage optimism about our financial institutions were of questionable thoroughness.

Can a controlled experiment explain why people like Kewpie dolls in one year, Beanie Babies in another, and American Girl dolls this year? Yet social scientists are asked to answer analogous questions. We economists and perhaps psychologists shouldn't overreact to the derision. That is, we shouldn't try to overlay a false sense of precision on our admittedly squooshy work.

A major boom in real stock prices in the US after Black Tuesday brought them halfway back to 1929 levels by 1930. This was followed by a second crash, another boom from 1932 to 1937, and a third crash. Speculative bubbles do not end like a short story, novel, or play. There is no final denouement that brings all the strands of a narrative into an impressive final conclusion. In the real world, we never know when the story is over.

My father, Benjamin Shiller, told me not to believe in authorities or celebrities - that society tends to imagine them as superhuman. It's good advice. People are snowed by celebrities all the time. In academia people have this idea of achieving stardom - publishing in the best journals, being at the best university, writing on the hot topic everyone else is writing about. But that's what my father told me not to do. He taught me that you have to pursue things that sound right to you.

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