The bogus businessman

[I]f voters don’t know anything about Mr. Trump’s policies, why their favorable impression of his economic management skills?

The answer, I suspect, is that voters see Mr. Trump as a hugely successful businessman, and they believe that business success translates into economic expertise. They are, however, probably wrong about the first, and definitely wrong about the second: Even genuinely brilliant businesspeople are often clueless about economic policy.

An aside: In part this is surely a partisan thing. Over the years, polls have generally, although not universally, shown Republicans trusted over Democrats to manage the economy, even though the economy has consistently performed better under Democratic presidents. But Republicans are much better at promoting legends — for example, by constantly hyping economic and jobs growth under Ronald Reagan, even though the Reagan record was easily surpassed under Bill Clinton.

Back to Mr. Trump: One of the many peculiar things about his run for the White House is that it rests heavily on his claims of being a masterful businessman, yet it’s far from clear how good he really is at the “art of the deal.” Independent estimates suggest that he’s much less wealthy than he says he is, and probably has much lower income than he claims to have, too. But since he has broken with all precedents by refusing to release his tax returns, it’s impossible to resolve such disputes. (And maybe that’s why he won’t release those returns.)

Remember, too, that Mr. Trump is a clear case of someone born on third base who imagines that he hit a triple: He inherited a fortune, and it’s far from clear that he has expanded that fortune any more than he would have if he had simply parked the money in an index fund.

But leave questions about whether Mr. Trump is the business genius he claims to be on one side. Does business success carry with it the knowledge and instincts needed to make good economic policy? No, it doesn’t.

True, the historical record isn’t much of a guide, since only one modern president had a previous successful career in business. And maybe Herbert Hoover was an outlier.

But while we haven’t had many business leaders in the White House, we do know what kind of advice prominent businessmen give on economic policy. And it’s often startlingly bad, for two reasons. One is that wealthy, powerful people sometimes don’t know what they don’t know — and who’s going to tell them? The other is that a country is nothing like a corporation, and running a national economy is nothing like running a business.