As S&P 500 selloff approaches 20%, what next?

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Google, Inc. (NASDAQ: GOOGL) Delayed: 345.90 -0.46 (0.13%)
Previous Close $346.36    52 Week High $839.00 
Open $346.80    52 Week Low $672.66 
Day High $350.45    P/E 9.60 
Day Low $344.50    EPS $36.05 
Volume 17,793,259       

UNIVERSAL HEALTH SERVICES, INC. CLASS B (NYSE: UHS) Delayed: 170.02 -1.19 (0.7%)
Previous Close $171.21    52 Week High $139.77 
Open $171.19    52 Week Low $100.82 
Day High $172.33    P/E 33.87 
Day Low $169.45    EPS $5.02 
Volume 460,382