How badly could mass layoffs during a government shutdown hurt the stock market? Here’s what experts say.

1. Federal agencies preparing mass layoffs if shutdown occurs, differing from past shutdowns. 2. S&P 500 historically shows little impact during shutdowns, often recovering post-shutdown. 3. Latest GDP data suggests economic resilience despite ongoing federal payroll declines. 4. Shutdown affecting all agencies may delay federal payments and shake consumer confidence. 5. Current S&P 500 high valuations raise potential market volatility amid shutdown uncertainty.