'First of all, 10 percent when you collect it is hundreds of billions of dollars … all reducing our deficit,' he said. 'But really, so there's two ways of looking at a tariff. You can do it as a money-making instrument, or you can do it as something to get the companies. Now, if you want the companies to come in, the tariff has to be a lot higher than 10 percent because 10 percent is not enough. Guys, they're not going to do it for 10, but you make a 50 percent tariff, they're going to come in.' Trump discusses tariffs as if they were a way of improving the free market. In fact, though, as the great economist Murray Rothbard points out in Power and Market, tariffs directly attack the essence of the free market, namely that people gain through mutually advantageous trade. Rothbard proves this by a brilliant reductio ad absurdum argument: "The absurdity of the pro-tariff arguments can be seen when we carry the idea of a tariff to its logical conclusion?"let us say,