Stocks rally when Congress goes on summer break. Here is the hidden reason.

The article argues that U.S. stocks tend to perform better when Congress is out of session, largely because legislative activity creates regulatory uncertainty and higher volatility. It cites historical studies showing the Dow and S&P 500 delivered much stronger annualized returns during congressional recesses than when lawmakers were in session. The piece says this pattern still appears to hold this year, with the S&P 500 posting small average daily losses while Congress was in session and gains when it was not. The author frames this as a market psychology and risk-premium effect rather than a myth, and notes that the effect may intensify after Labor Day and in midterm-election years, when legislative urgency and uncertainty rise. Overall, the article is a broad market commentary implying a mildly bullish seasonal tailwind for equities during congressional breaks.