Canada is hitting back at US tariffs with matching duties on hundreds of American products, bad news for workers and shoppers on both sides of the border.

• Starting September 8, Canada puts counter-tariffs of up to 50% on roughly $27.6 billion of US goods, matching each American tariff rate.
• The list runs to about 700 items — steel, aluminum, furniture, appliances, dairy, fish, plywood, motorcycles, industrial robots, even golf clubs and cosmetics.
• Americans get hit too: car prices could rise thousands of dollars, and the auto sector faces layoffs on both sides.
• Canada is holding back its bigger weapons — cutting off energy exports and selling off its large pile of US government debt, which would raise US borrowing costs.
• Canada is also courting other trading partners, including China, so it never depends on one country again.

Outlook: Expect more escalation and consumer boycotts unless both sides cut a deal, with roughly 90,000 Canadian jobs and US auto work on the line.