Donald Trump signs an order imposing broad 25% tariffs on steel and aluminum imports, upending U.S. supply chains, as NFIB's index of small-business uncertainty hits its third-highest figure on record. Meantime, the Labor Department reports that inflation is heating up again, with the consumer-price index rising 3% over the 12 months ending in January, as Federal Reserve Chairman Jerome Powell testifies on Capitol Hill about how these crosscurrents might affect monetary policy.

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