Stocks Tumble as Investors Balk at Tariff Plan

Stocks hadn’t fallen this far this fast since the early days of the coronavirus pandemic. A 9.1 percent drop in the S&P 500 is the steepest weekly decline since March 2020.

S&P 500 Has Worst Day Since June 2020 as Trade War Sets Off Slump

The S&P 500 fell almost 5 percent on Thursday, its worst drop since June 2020, as President Trump’s higher-than-expected tariffs set off another round of economic worry.

Stocks Slump as Trump Tariffs Take Effect

The S&P 500 added to recent losses in early trading. German automakers, many of which have plants in Mexico that make vehicles that are sold in the United States, were especially hard hit.

Businesses Are Betting on a Tax Cut Extension

The federal budget debate has big implications for the economy. Despite questions about the math, investors expect an extension of the 2017 tax cuts.

After DeepSeek Upended the Market, Is It Worth Investing in A.I.?

After the arrival of a less costly A.I. model from China, U.S. markets and academics are wrestling with the ultimate economic value of the technology.