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Group 1 - The U.S. government shutdown has led to a decline in the stock market, with S&P 500 futures down 0.6% and Nasdaq 100 futures down 0.75% [2] - The shutdown threatens to interrupt the S&P 500's 14% increase this year, raising concerns about the resilience of the labor market [5] - Research indicates that the shutdown could increase the U.S. unemployment rate from 4.3% to 4.7%, with potential mass layoffs by Trump exacerbating economic pain [5] Group 2 - Historical data shows that the stock market generally reacts mildly to government shutdowns, but defense contractors and airlines may face higher volatility due to reduced government revenue and federal employee travel [5] - Citigroup emphasizes that the duration of the shutdown is critical; longer shutdowns typically weaken stocks and strengthen bonds [6] - The Congressional Budget Office estimates that approximately 750,000 federal employees will be forced to take leave due to the shutdown [6] Group 3 - The absence of key economic data, particularly the non-farm payroll report, raises concerns among investors about the labor market's health [6] - Historically, stock markets have tended to rise during government shutdowns, with the S&P 500, mid-cap 400, and small-cap 600 indices averaging over 3% gains during the last five shutdowns [6]