This is the second in my new occasional series of reflections on some of the root causes of the global economic crisis. As is probably evident from the first one, I’m not going to try to identify the cause of the crisis, or even render particularly analytical judgments about the relative importance of various contributing factors. Instead, I’m more just presenting and thinking about some of the forces that were at work.
One of the singular features of the last decade was the U.S. housing bubble (replicated elsewhere, such as the U.K. and Spain, but nowhere on such a grand scale), which was accompanied by a broader though not quite as frothy bubble in asset prices overall, including the stock market. One of the standard explanations is that bubbles are created when greed takes over from fear: people see prices rising, and at first their fear of getting burned keeps them on the sidelines, but as the bubble continues and other people get rich their own greed increases until it wins out over fear, and they buy into the bubble as well. As a result, some say, we are bound to have bubbles periodically, especially when new investors (young people), who have never experienced a crash, come into the market.
There is psychological research that not only backs all of this up, but goes even further and says that bubbles are a virtual certainty. Virginia Postrel has an article in The Atlantic that centers on experimental economics research by people such as Vernon Smith and Charles Noussair. In one experiment, investors trade a security that pays a dividend in each of 15 periods and then vanishes; the dividend in each period will be 0, 8, 28, or 60 cents with equal probability, so the expected dividend is 24 cents, and there is no time value of money (the whole experiment takes an hour). Despite the fact that the fundamental value of the security is absolutely, completely, easily knowable, bubbles develop in these markets . . . 90% of the time. When the same people repeat the same experiment, the bubbles get gradually smaller; but simply change the spread of dividends and the scarcity of the asset, and the bubbles come back with full force (so much for experienced investors).
The Baseline Scenario 