Markets in Asia and Europe reflected investors’ continued worries about the economic disruption of President Trump’s trade policies. Stocks in America are poised to open lower, again.

Share prices fell sharply for a second day on Friday in Asia, and futures market trading indicated that American share prices might soon tumble further as well, as worries spread about the economic effect of President Trump’s broad tariffs.

The Nikkei 225 Index in Japan was down 3.8 percent. That followed a 2.8 percent drop on Thursday after Mr. Trump announced a far-reaching revision of American tariffs that included an extra 24 percent on goods from Japan.

In South Korea, the Kospi Index fell 1.7 percent on Friday after dipping 0.8 percent the prior day. President Trump this week put a 26 percent tariff on imports from South Korea.

American share prices have fallen faster than those in other markets since Mr. Trump’s inauguration, and their underperformance appeared set to continue on Friday. Futures on the S&P 500 were down 2.2 percent on Friday.

The S&P 500 suffered its worst single-day loss since 2020 on Thursday, plummeting 4.8 percent.