David D. Kirkpatrick and Jamie Heller

Reader Response from The Fray--to be read after the most recent entry:


I still don't understand how the stock market can be efficient in the long term and not the short run. And I'm not relying merely on Keynes' famous sentiments about the long run; my point is even simpler: when is the long run? Was Microsoft's long run value from 1990 to early 2000 or to today? Short run volatility must have consequences for people who claim long run efficiency. To my mind, and for many other reasons, believing in efficient markets is like believing in Santa Claus--there are correlations between expected results and reality, but people really ought to grow up and accept that no-one on Wall Street knows anything.

--Jeff

(To reply, click here.)

(5/22)

To Jeff: Various natural processes are long-term efficient without being short-term efficient, for example the downhill flow of water or the process of natural selection (aka evolution). Complex human processes seem to have similar behavior. Perhaps efficient is being confused with "optimal". The problem with most strategies that attempt to be optimal is that they often have truly horrendous failure cases, which wipe out all their interim or theoretical gains. Democracy has been called "the worst form of government, except for all the rest." It is hardly optimal, and in many cases very inefficient. A dictator could get the graffiti cleaned up and the trains running on time; democracy seems to have a hard time doing such things. But what about the failure case of a less-than-benign dictator or a dictator whose benign intentions diverge from many or most of the desires of the population? An example of short-term efficiency vs. long-term, in terms of human happiness.

That's not to say short-term efficiency is bad, or that we can't improve on raw systems. But it is possible for a strategy to be the best long-term one without exhibiting short-term efficiency.

--Paul Canniff

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(5/23)

• E.J. Dionne: Obama, Iraq and a Hard Place
• Fareed Zakaria: America Is Not at War
• Robert Novak: Mutiny on the GOP Bounty
• Michael Kinsley: Al Franken, Funny but Serious