Lumber futures have risen about 19% from a low hit in early September, driven by the production cuts, hopes that declining interest rates will revive the housing market and Trump’s import tax. The 10% levy is on top of steep duties on Canadian lumber, which are adjusted annually in a heavily litigated process that is the result of a decades-long trade dispute. Those antidumping and countervailing duties rose in August to about 35% for most Canadian producers, up from roughly 15%. Canada’s sawmills are by far the largest source of softwood lumber from beyond U.S. borders, fulfilling about 24% of domestic consumption last year. Other significant importers of softwood lumber, the type used to frame houses, include Brazil and European countries such as Germany and Sweden. Homebuilders argue that import taxes will raise construction costs. U.S. lumber producers and timberland owners, however, urged Trump to enact a tariff.