rational (adj) 1. Having or exercising the ability to reason.
2. Of sound mind; sane.
3. Consistent with or based on reason; logical
Many people have told me that markets are rational, meaning, in most cases, that markets can make decisions about various topics (prices, wages, quantities to be manufactured, etc…) in a rational way. Some hold this belief so strongly that they use the word “rational” to mean in accordance with the workings of the market. Hence some assert that it’s rational to charge the highest price you can get for a service, pay the lowest wages you can for your employees, choose the lowest available prices when buying an item, and so forth. I disagree. I think that all of those decisions can be highly irrational in certain circumstances. Further, I think that the widespread existence of markets compounds the problem and leads to peaks of irrationality far beyond what individual humans would ever reach.
Before looking at examples, I suppose I should explain what I do mean by rationality. As we see in the above definition, rationality is not defined by markets. Rational means in accordance with logic and reason. We start out with premises based on reason, and we use the rules of logic to derive conclusions from those premises. In order to have this discussion, we must agree that human reason and logic exist, are valid, and are not completely arbitrary. Since those who believe that markets are rational generally accept this much, that shouldn’t raise much controversy.
Then it’s possible, in theory, for markets to oppose rationality. For instance, we have a reasonable statement: 2+2=4. Anything contradicting this is unreasonable: 2+2=5, 2+2=3, 2+2 can be anything, 2+2 is unknowable, and so forth. Thus, publishing a book asserting that 2+2=4 is rational. Publishing a book asserting one of the other approaches to 2+2 is irrational, even if you can make a profit by doing so. (Not a purely theoretical question, by the way.)
Now let’s look at some serious violations of rationality by markets.
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Wages. Some professional athletes are, as Calvin’s Dad said, among the most overpaid people on the planet. Several earn more than $10,000,000 per year. Compare that to a brain surgeon earning about $300,000 per year. That’s irrational. A rational individual who needed a brain tumor removed and wanted to watch a baseball game would spend money assuring that they got the best brain surgery, even if it meant watching mediocre baseball players, rather than the other way around.
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The dot-com bubble. A classic example of “irrational exuberance”, this was when worthless companies such as furniture.com, priceline.com, theglobe.com, and kozmo.com, raised ridiculous amounts of money, sometimes in the tens or hundreds of billions, without ever having a sound business plan. If you actually read the IPOs of some of these companies, they clearly stated that there was little hope of them ever making a profit. No rational individual would ever sink a hundred billion into a company that was almost guaranteed to go bankrupt.
These cases and others, to me, disprove the claims that markets are rational. Discuss.
(A final note: this is not a debate about whether markets are morally right. That’s been debated in many other threads, and doubtlessly will be again.)