Keynes's contribution was not just to advocate spending government money in the middle of a recession. Every government had done that going back to the days of the Irish potato famine. What he gave to us was a way of thinking about the magnitude and the dimensions and so forth.

I came to the University of Chicago on the morning of January 2, 1932. I wasn't yet a graduate of high school for another few months. And that was about the low point of the Herbert Hoover/Andrew Mellon phase after October of 1929. That's quite a number of years to have inaction.

To a person of analytical ability, perceptive enough to realise that mathematical equipment was a powerful sword in economics, the world of economics was his or her oyster in 1935. The terrain was strewn with beautiful theorems begging to be picked up and arranged in unified order.

Two factors explain our success. One, MIT's renaissance after World War II as a federally supported research resource. Two, the mathematical revolution in macro- and micro-economic theory and statistics. This was overdue and inevitable, MIT was the logical place for it to flourish.

There is something in people; you might even call it a little bit of a gambling instinct… I tell people investing should be dull. It shouldn't be exciting. Investing should be more like watching paint dry or watching grass grow. If you want excitement, take $800 and go to Las Vegas.

The niceties of existence were not a matter of concern, yet everything around was closed down most of the time. If you lived in a middle-class community in Chicago, children and adults came daily to the door saying, 'We are starving, how about a potato?' I speak from poignant memory.

First, those who disagree with market efficiency simply assert that it stands to common sense that greater effort to get facts and greater acumen in analyzing those facts will pay off in better performance somehow measured. (By this logic, cure for cancer must have been found by 1955).

Anyone with special abilities earns a differential return on that flair, which we economists call a rent. Those few with extraordinary P.Q. (Performance Quotient) will not give away such rent to the Ford Foundation or the local bank trust department. They have too high an I.Q. for that.

Even if this advice to portfolio decision makers to drop dead is good advice, it obviously is not counsel that will be eagerly followed. Few people will commit suicide without a push. And fewer still will pay good money to be told to do what is against human nature and self-interest to do.

I can tell you, because I serve on so many nonprofit boards - where half of us are academics and half of us are from Wall Street - that there's no CEO who understands at all a derivative. All they know is that somebody tells them in their organization, 'We've got a wonderful profit center.'

The contrafactual history is what it would have been the other way. Think of the Kennedy triumph in the missiles crisis. Worked out fine. Khrushchev blinked and so forth. The other road, you don't want to think too hard about. You could have had nuclear missiles wiping out a tenth of the globe.

The parts of physics that are exact are the parts of physics that are exact. The parts that are inexact are vastly greater. Sensible scientists don't waste their time pushing against doors that endlessly will not give. They are opportunistic and go where they can, but there are pitfalls in that.

One of the pleasing things about science is that we do all climb towards the heavens on the shoulders of our predecessors. Economics, like physics, has its heroes, and the letter 'H' that I used in my mathematical equations was not there to honor Sir William Hamilton, but rather Harold Hotelling.

I'm not speaking in favor of killing innovation. I'm speaking in favor of centrist use of the market, which involves necessarily a considerable degree of regulation. Markets by themselves will get themselves inevitably into inequality and into their own destruction. It will happen again and again.

Economics is not an exact science. It's a combination of an art and elements of science. And that's almost the first and last lesson to be learned about economics: that in my judgment, we are not converging toward exactitude, but we're improving our data bases and our ways of reasoning about them.

Mea culpa, mea culpa. MIT and Wharton and University of Chicago created the financial engineering instruments, which, like Samson and Delilah, blinded every CEO. They didn't realize the kind of leverage they were doing and they didn't understand when they were really creating a real profit or a fictitious one.

American society was economically ill-run in the 1980s. Our society has been on a consumption binge. If the American people had a town meeting and said, 'What do we care about posterity? Posterity hasn't done anything for us; we're going to whoop it up now,' that is a rational judgment. But nobody ever did that.

I think that it's more important for an economist to be wise and sophisticated in scientific method than it is for a physicist because with controlled laboratory experiments possible, they practically guide you; you couldn't go astray. Whereas in economics, by dogma and misunderstanding, you can go very sadly astray.

To prove that Wall Street is an early omen of movements still to come in GNP, commentators quote economic studies alleging that market downturns predicted four out of the last five recessions. That is an understatement. Wall Street indexes predicted nine out of the last five recessions! And its mistakes were beauties.

By keeping labor supply down, immigration policy tends to keep wages high. Let us underline this basic principle: Limitation of the supply of any grade of labor relative to all other productive factors can be expected to raise its wage rate; and increase in supply will, other things being equal, tend to depress wage rates.

Our ideal society finds it essential to put a rent on land as a way of maximizing the total consumption available to the society. ...Pure land rent is in the nature of a 'surplus' which can be taxed heavily without distorting production incentives or efficiency. A land value tax can be called 'the useful tax on measured land surplus'.

U.S. capital formation, which has been pretty high in the '90s and very high in the late 1990s, is what is being financed by the savings of the rest of the world, generally poorer than ourselves, because our deficit on current account, chronic deficit, is their surplus, and they have been willingly bringing that to the American market.

Second, they [those who disagree with market efficiency] always claim they know a man, a bank, or a fund that does do better. Alas, anecdotes are not science. And once Wharton School dissertations seek to quantify the performers, these have a tendency to evaporate into the air - or, at least, into statistically insignificant t-statistics.

The failure of market catallactics in no way denies the following truth: given sufficient knowledge the optimal decisions can always be found by scanning over all the attainable states of the world and selecting the one which according to the postulated ethical welfare function is best. The solution 'exists'; the problem is how to 'find' it.

My family was well off but not rich. I spent the four years I was an undergraduate working on the beach. And it wasn't because I was lazy; it was because my freshman class would go to a hundred different employers and wouldn't get a nibble. That was a disequilibrium system. I realized that the ordinary old-fashioned Euclidean geometry didn't apply.

Suppose it was demonstrated that one out of twenty alcoholics could learn to become a moderate social drinker. The experienced clinician would answer, 'Even if true, act as if it were false, for you will never identify that one in twenty, and in the attempt five in twenty will be ruined.' Investors should forsake the search for such tiny needles in huge haystacks.

The debate can be put in the form of the question: Resolved, that the best of money managers cannot be demonstrated to be able to deliver the goods of superior portfolio-selection performance. Any jury that reviews the evidence, and there is a great deal of relevant evidence, must at least come out with the Scottish verdict: Superior investment performance is unproved.

An American economist of two generations ago, H. J. Davenport, who was the best friend Thorstein Veblen ever had (Veblen actually lived for a time in Davenport's coal cellar) once said: "There is no reason why theoretical economics should be a monopoly of the reactionaries." All my life I have tried to take this warning to heart, and I dare call it to your favorable attention.

Even fans of actively managed funds often concede that most other investors would be better off in index funds. But buoyed by abundant self-confidence, these folks aren't about to give up on actively managed funds themselves. A tad delusional? I think so. Picking the best-performing funds is 'like trying to predict the dice before you roll them down the craps table,' says an investment adviser in Boca Raton, FL. 'I can't do it. The public can't do it.'

Still, I figure we shouldn't' discourage fans of actively managed funds. With all their buying and selling, active investors ensure the market is reasonably efficient. That makes it possible for the rest of us to do the sensible thing, which is to index. Want to join me in this parasitic behavior? To build a well-diversified portfolio, you might stash 70 percent of your stock portfolio into a Wilshire 5000-index fund and the remaining 30 percent in an international-index fund.

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