Vote for me, dimwit

In Vote for me, dimwit, the Economist reviews Bryan Caplan's The Myth of the Rational Voter:

The world is a complex place. Most people are inevitably ignorant about most things, which is why shows like “Are You Smarter than a 5th Grader?” are funny. Politics is no exception. Only 15% of Americans know who Harry Reid (the Senate majority leader) is, for example. [...] Many political scientists think this does not matter because of a phenomenon called the “miracle of aggregation” or, more poetically, the “wisdom of crowds”. If ignorant voters vote randomly, the candidate who wins a majority of well-informed voters will win. The principle yields good results in other fields. On “Who Wants to Be a Millionaire?”, another quiz show, the answer most popular with the studio audience is correct 91% of the time. Financial markets, too, show how a huge number of guesses, aggregated, can value a stock or bond more accurately than any individual expert could. But Mr Caplan says that politics is different because ignorant voters do not vote randomly.

Instead, he identifies four biases that prompt voters systematically to demand policies that make them worse off. First, people do not understand how the pursuit of private profits often yields public benefits: they have an anti-market bias. Second, they underestimate the benefits of interactions with foreigners: they have an anti-foreign bias. Third, they equate prosperity with employment rather than production: Mr Caplan calls this the “make-work bias”. Finally, they tend to think economic conditions are worse than they are, a bias towards pessimism.

An amusing illustration:

The make-work bias is best illustrated by a story, perhaps apocryphal, of an economist who visits China under Mao Zedong. He sees hundreds of workers building a dam with shovels. He asks: “Why don't they use a mechanical digger?” “That would put people out of work,” replies the foreman. “Oh,” says the economist, “I thought you were making a dam. If it's jobs you want, take away their shovels and give them spoons.”