Donald Trump brandished a chart as he announced baseline 10 per cent tariffs on imports from all countries — but what was on it?

Investors weren’t happy with President Donald Trump’s reciprocal tariffs, sending stocks tumbling in premarket trading and overseas.

Beginning on April 9, the United States will impose country-specific “reciprocal” tariffs targeting 57 named countries, with rates reaching as high as 50 percent. At a minimum, each country will pay a ...