Trump's new 50% tariffs on Canada bypass USMCA — here's what it really means for you.

President Trump just hit a limited set of Canadian goods with 50% tariffs, and he did it by dusting off Section 338 of the Tariff Act of 1930 — a law last used when Herbert Hoover was in the building. Justin Wolfers walks you through what actually happened, why it's stranger than it sounds, and why the direct cost to the U.S. is smaller than the message behind it.

Here's the twist: throughout the earlier trade wars, being compliant with the USMCA free trade agreement was your escape hatch — roughly 90% of Canadian goods came in duty-free. These new proclamations ignore that agreement entirely. Justin's quick-and-dirty math says the tariffs cover a bit more than $20 billion of imports, about 5% of what we buy from Canada — meaning maybe $50 to $150 a year on your household, plus higher prices from American firms that now face less competition. For Canada it's a real hit: close to 1% of GDP.

But the bigger story is confidence. If a signed trade deal only holds until the next presidential mood swing, it's not really a rule. Justin argues Canada is the test case — a warning to the roughly 60 countries facing new tariffs any week now: retaliate, and your trade deal may not save you.

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