Poor data once again triggered concerns about economic weakness, U.S. stocks suffered "open door black" on the first trading day of September, the Nasdaq fell 3.2%, the Dow closed down 1.5%, the S & P 500 fell 2.1%, the fear and pleasure index VIX surged 33.2%。Chip stocks weak, Nvidia down 9.53%, market value overnight evaporation of more than 278.9 billion U.S. dollars (about 1986.2 billion yuan)。International oil prices fell more than 4 percent on Tuesday, erasing this year's gains to their lowest level since Dec. 12, 2023.。