President Trump Says Mexico Will Pay for the Wall. But His Tax Plan Means Americans Will

5 reasons the President's proposal is a really, really bad idea. · Fortune

Donald Trump’s peso politics may end up poisoning American pocketbooks.

On Thursday, President Trump floated a possible plan to pay for a wall between Mexico and the U.S.--a 20% tax imposed on importers of the stuff that is made in Mexico and shipped to the United States. And there is a lot of that stuff: About $295 billion worth of goods last year alone.

Trump said the plan, which was detailed by Trump’s press secretary Sean Spicer before he later backed away from the proposal saying it was one of a number on the table, would force Mexicans to pay for building That Wall. And it sounds like it would, if you don’t know anything about economics or trade relations between Mexico and the U.S., or really trade relations at all. The people who will ultimately pay aren’t Mexicans, but U.S. customers who’re currently getting a great deal on their products.

Unfortunately, the plan amounts to what’s practically a textbook case in damaging, unintended consequences for the U.S. economy and consumers. The main point is that when a nation imposes a tariff on another nation’s goods, it’s a tax that, according to classical economics, generally raises the prices, and lowers the volume of sales, of those imports.

As we’ll see, that’s not a good thing for the U.S. or its consumers. Let’s count the ways (and Mr. President, maybe you can count along with us).

Mexican companies would only write the checks. All import duties on cars, plastics, electronic components, and everything else we import from Mexico would at least in part be simply tacked onto the price of either the final products, or the components sold for final production in the U.S. So it’s our shoppers who would mainly pay for those markups. Mexican companies are simply intermediaries who would collect money from U.S. consumers, and send the funds to the Treasury. “To pretend that Mexican companies would really pay is a distortion,” says J. Bradford Jensen, an economics professor at Georgetown University. “U.S. consumers who would pay a lot of those costs.”

50% of the content of imports from Mexico are components and other materials made in the U.S. The tariff would force Mexican companies to raise prices, though probably far less than the full 20%, since they’d take part of the hit by shrinking margins. That would make their goods less attractive to U.S. consumers, and they’d sell a lot less autos and appliances in the U.S. than they do today. At the same time, that would lower any revenue generated by the border tax to pay for the wall.