Stocks on Wall Street were back in negative territory for the year on Friday, as a decline reflecting economic concerns extended into its third day this week.
Investors have been worrying about the potential economic fallout from a trade war between the United States and China, and its impact on corporate profits. That concern was heightened this week, after the arrest of a top Chinese technology executive in Canada at the behest of authorities in the United States.
On Friday, investors were digesting the news that the United States economy added 155,000 jobs in November. While a sign of robust hiring, the figure was below expectations as well as the monthly average for the last three months. Stocks initially rose in the wake of that report.
Stocks turned lower after Peter Navarro, the director of the White House trade office, said on CNN that the United States would increase tariffs on Chinese imports if the two countries cannot reach an agreement on trade by the end of a 90-day negotiating period. President Trump and President Xi Jinping of China had agreed on Saturday to the standstill on new tariffs, but investors have been confused about the nature of the agreement ever since it was signed, and markets have been roiled by the uncertainty.
Stocks rose on Monday following news of the agreement. But after Mr. Trump took to Twitter to threaten China with further tariffs, and then news broke of the arrest of Meng Wanzhou, a top executive of Huawei Technologies, markets went into a tailspin. For the week, the S&P 500 is down nearly 4 percent.
Technology stocks, which have been particularly hard hit in the recent phase of the stock sell-off, were among the worst performers on Friday. Semiconductor maker Advanced Micro Devices, which is seen as particularly susceptible to trouble with