(AP) -- Stocks marched broadly higher on Wall Street in early trading Monday after President Donald Trump claimed China was willing to reopen talks on the costly trade war that has roiled markets and dimmed the outlook for global economic growth.
Uncertainty remained high, however, about the next developments in the trade dispute, which has repeatedly seen the sides attempt to negotiate before ending in acrimony and more tariffs and trade penalties.
Big technology companies, which do a lot of business in China and have much riding on the outcome of the trade dispute, rose the most. Apple climbed 2%.
Health care and financial stocks also contributed to the big share of the early gains as the market clawed back some of the heavy losses from last week, which marked its fourth straight weekly loss. On Friday, the Dow Jones Industrial Average plunged more than 600 points after Washington and Beijing each threatened a new round of tariffs on each other's goods.
The escalation in the trade conflict had global markets headed for another sell-off until Trump said his trade negotiators had received two "very good calls" from China on Sunday. China's foreign ministry replied, however, that it didn't know what Trump was talking about.
The S&P 500 was up 0.5% as of 10:10 a.m. Eastern Time. The Dow gained 154 points, or 0.6%, to 25,779. The Nasdaq rose 0.7%.
Major indexes in Germany and France rose. Markets in Britain were closed for a national holiday. In Asia, Hong Kong's Hang Seng and Japan's benchmark Nikkei 225 closed lower.
Stock markets have been volatile this summer as traders have been whipsawed by the turns in the trade war between the world's biggest economies.
The conflict escalated once again on Friday, after China announced new tariffs on $75 billion in U.S. goods. Trump responded angrily on Twitter, at one point saying he "hereby ordered" U.S. companies with operations in China to consider moving them to other countries, including the U.S.
Trump also later announced that the U.S. would increase existing tariffs on $250 billion in Chinese goods to 30% from 25%, and that new tariffs on another $300 billion of imports would be 15% instead of 10%.
Stephen Innes, managing partner at Valour Markets in Singapore, compared the difficulty of assessing the volatile market situation to reading tea leaves.
"Nobody understands where the president is coming from," he said, adding that the best thing Trump can do for market stability is to "keep quiet."
The market is now dominated by fears of a portending U.S. recession, although the American economy is actually holding up, and much of the U.S. economy is made up of consumption, Innes said. If interest rates come down, he added, consumer spending is likely to go up, working as a buffer for the economy.
Some analysts think the Federal Reserve will lower interest rates again this year. Fed Chairman Jerome Powell indicated last week that the central bank was prepared to cut interest rates but gave no clear signal on when or by how much, while suggesting that uncertainty over Trump's trade wars have complicated the central bank's ability to set interest rate policy.
A quarter-point rate cut in September is considered all but certain. Some think the Fed will cut rates again in December.
Meanwhile, China allowed its currency, the yuan, to fall further on Monday. That effectively helps its exporters, negating some of the effects of higher U.S. tariffs.
The yuan declined to 7.1468 to the dollar, a relatively modest change from Friday's low point of 7.0927 but its weakest rate since January 2008. The yuan has lost 6.5% from this year's high on Feb. 28.
Economists say that the unpredictability of the trade dispute is at least as damaging as the tariffs themselves, affecting the decisions of central banks and companies as they plan investments.
Zhu Huani, analyst at Mizuho Bank in Singapore, said that what he called Trump's "tariff tantrum" was setting off "the sense that tariffs could continue to rise."
"No matter which way you cut the cake, it is nearly impossible to construct a bullish, or even neutral scenario for equity markets today," said Jeffrey Halley, senior market analyst at Oanda.