However, the current high rate of earnings growth in excess of 80% cannot last, they said in a July 22 report. “The valuation dilemma is forecasting when and how quickly earnings growth will slow; which is something that every analyst has misjudged so far.”

The Nasdaq-100 ETF is up about 10% year to date to outperform the S&P 500 by a slight margin.

PowerShares QQQ


Full disclosure: Tom Lydon’s clients own AAPL.