President Trump favors protectionist trade policies that, supposedly, protect American workers and companies from hostile economic forces abroad. That’s the theory, anyway. The practice looks a whole lot different. Case in point: a Department of Commerce investigation into supposed “dumping” of newsprint and other paper products by Canada. “Dumping” happens when someone sells something at an especially low price. That’s great for buyers — stores usually call it a “sale” — but not so great for some competitors. The investigation began as the result of a single complaint from a single company that has a single paper mill in Longview, Washington. The company is owned by a hedge fund. Pretty much the rest of the paper industry in the U.S. is on the other side of the issue, including the American Forest and Paper Association.