After a period of decline, the S&P and Nasdaq finally showed signs of stopping the decline, but the rebound was weak. The market is still waiting for the Fed's interest rate decision next week and the CPI data to be released tonight.

1. Market volatility: Market volatility may not fall back quickly in the short term, especially before the Quadruple Witching Day next Friday, and stock index volatility may remain high.

2. Political impact: Harris and Trump's first presidential election debate affected market sentiment. Harris's performance increased the Democratic Party's chances of winning, but increased uncertainty before the election.

3. VIX index: The VIX index is still at a high level (around 20), and the market expects volatility to remain high before the election.

4. CPI data expectations: The market expects the core CPI to grow by 0.2% month-on-month and 3.2% year-on-year in August, while the overall CPI year-on-year growth rate is expected to fall to 2.6%.