Commentary: Trump sticks to his gut on China tariffs. That’s terrible

The current trade flap with China is a great reminder of one of my favorite themes: why presidents should not be guided by what they think is right.That certainly seems to be what's going on here. Donald Trump's commitment to tariffs, and more generally to zero-sum mercantilist thinking about trade, is very much personal, as my Bloomberg Opinion colleague Timothy L. O'Brien explains.But whatever Trump thinks, he’s hardly a serious expert on international trade - as demonstrated by his expl