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

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PowerShares QQQ Trust, Series 1 (NASDAQ: QQQ) Delayed: 737.95 --0 (-0%)
Previous Close $737.95    52 Week High $119.66 
Open $737.95    52 Week Low $94.84 
Day High $737.95    P/E N/A 
Day Low $737.95    EPS $0.00 
Volume 2,698,467       

S&P DEP RECEIPTS (NYSE: SPY) Delayed: 744.39 --0 (-0%)
Previous Close $744.39    52 Week High $219.60 
Open $744.39    52 Week Low $181.02 
Day High $744.39    P/E N/A 
Day Low $744.39    EPS $0.00 
Volume 1,537,635