Hill Jam Researchers at the University of Warwick in the UK affirm the work of other economists in finding that the imposition of tariffs harms both the foreign countries supplying goods and the nation erecting such market access barriers. Japanese Prime Minister Shinzō Abe affirmed that principle this week when he said, “Restrictive [import] measures are not in the interests of any country.” This raises the question as to why countries retaliated against Mr. Trump’s steel and aluminum tariffs since their actions constituted self-harm. Political analysis in Washington this week predicts that U.S. House Speaker Nancy Pelosi (D-California) will not allow votes on USMCA or an eventual trade agreement with Japan because of t...