Quotulatiousness

May 25, 2011

How to analyze bubbles and crashes

Filed under: China, Economics, History, Media — Tags: , , , — Nicholas @ 07:06

Warren C. Gibson reviews Boombustology by Vikram Mansharamani, which looks at the boom and bust pattern frequently seen in economics, with special emphasis on China:

The author’s macro lens includes Austrian business cycle theory. That theory says inflation of the money supply causes a drop in interest rates, which is misinterpreted as an increased aggregate preference for saving over consumption, leading to investments in more roundabout means of production. When it becomes clear that there has been no such preference shift, these undertakings are seen to be at least partial mistakes, requiring write-offs and retrenchment — a bust. The boom is the problem, not the bust, which is the market’s attempt to realign itself to the realities of time preference. Austrian business cycle theory has great merit but leaves some things unexplained.

Mansharamani’s micro lens includes the concept of reflexivity. Market participants don’t just observe prices but also influence them. Reflexive dynamics occasionally give rise to instabilities in which rising prices lead to increased demand. A simpler term would be a “bandwagon effect.” I recall an office party in 1980 where one of the secretaries asked about buying gold — precisely at the peak, as it turned out. All she knew about gold was that it was way up and therefore must be going higher. I should have realized that when you see financially unsophisticated people like her climbing on a bandwagon, you can be pretty sure there’s no one left to sell to and nowhere for prices to go but down, which is where gold and silver prices went in 1980, and in a big hurry.

From psychology Dr. M. borrows ideas and data about cognitive biases. For example, subjects asked to guess some bland statistic, like the number of African countries that belong to the UN, are influenced by the spin of a wheel of fortune: When the wheel lands on a high number, they guess higher. He translates this and a dozen other cognitive biases into irrational market behavior that can foster booms and busts.

He introduces his biology lens with an analogy to the spread of an infectious disease. When the prevalence of a disease reaches a high level, the infection rate necessarily slows and the disease begins to wane, just like the 1980 gold market. But it is devilishly difficult to “inoculate” oneself against infectious ideas. Individual investors who can do so have a decent chance to beat the market averages over time, I believe. (Those who would pursue these ideas in greater depth would do well to find James Dines’s quirky and expensive but worthwhile book, Mass Psychology.)

Governments don’t have the power to prevent booms and busts — but they sure do have the ability (and too often, the will) to extend booms as long as possible, which only makes the necessary correction that much more painful.

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