While it's impossible to predict the future or even identify market tops, there are a number of troubling signs that suggest stocks are too high. I discuss three of these in the video below, including the absolute level of the S&P 500 (SNPINDEX: ^GSPC ) , valuation expansion over the last year, and the overexuberance of investors in the recent IPOs of Potbelly (NASDAQ: PBPB ) and Noodles & Co. (NASDAQ: NDLS ) .
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