Any pullback in the S&P 500 is a buying opportunity: Yardeni

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PowerShares QQQ Trust, Series 1 (NASDAQ: QQQ) Delayed: 717.67 --0 (-0%)
Previous Close $717.67    52 Week High $119.66 
Open $717.67    52 Week Low $94.84 
Day High $717.67    P/E N/A 
Day Low $717.67    EPS $0.00 
Volume 415,603       

S&P DEP RECEIPTS (NYSE: SPY) Delayed: 773.17 --0 (-0%)
Previous Close $773.17    52 Week High $219.60 
Open $773.17    52 Week Low $181.02 
Day High $773.17    P/E N/A 
Day Low $773.17    EPS $0.00 
Volume 254,698