当美联储重启降息，美股会发生什么？

Core Viewpoint - The expectation for a Federal Reserve interest rate cut in September has significantly increased following Chairman Powell's dovish speech at the Jackson Hole global central bank conference, leading to positive reactions in global financial markets [1][2]. Summary by Sections Federal Reserve Rate Cut Expectations - Current market expectations indicate an 85% probability of a 25 basis point rate cut in September, up from 75% a week prior. Additionally, there is an 83.9% probability that the Fed will implement at least two rate cuts this year [3]. Historical Performance of the S&P 500 - Historical data shows that after the Fed pauses for 5 to 12 months and then resumes rate cuts, the S&P 500 index has averaged a 12.9% increase over the following year, with 10 out of 11 instances resulting in gains [2][1]. Market Sentiment and Investor Behavior - Investor sentiment has shifted from questioning whether the Fed will cut rates to focusing on the frequency and pace of potential cuts. This change in focus is attributed to Powell's indication that a rate cut may be reasonable due to concerns about the labor market [2][5]. Impact on Stock Market Sectors - Analysts predict that if the Fed cuts rates in September, the stock market rally may extend beyond large-cap tech stocks, as lower rates typically encourage investors to seek higher returns along the risk curve. Small-cap stocks, which are more sensitive to borrowing costs, may particularly benefit from this environment [6][5].