Why are stock prices still rising? Yardeni explains

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ISHARES CORE S&P 500 ETF (NYSE: IVV) Delayed: 758.11 +3.06 (0.41%)
Previous Close $755.05    52 Week High $220.88 
Open $755.67    52 Week Low $181.90 
Day High $758.94    P/E N/A 
Day Low $751.64    EPS $0.00 
Volume 4,659,854       

S&P DEP RECEIPTS (NYSE: SPY) Delayed: 754.95 +3.24 (0.43%)
Previous Close $751.71    52 Week High $219.60 
Open $752.05    52 Week Low $181.02 
Day High $755.42    P/E N/A 
Day Low $748.10    EPS $0.00 
Volume 42,292,563