Canada’s trade-support machinery is being widened again as a fresh round of U.S. tariffs adds another layer of uncertainty for exporters already navigating a radically different North American market.

Tariffs and taxes both impose financial costs and generate government revenue, but they differ in where they apply and what policymakers use them to accomplish. Taxes can apply broadly to income, ...

President Trump has announced 50 percent tariffs on some Canadian goods. President Donald Trump has imposed a 50 percent tariff on several Canadian goods, but whether the decision will go into effect ...