Investors have zero complaints about the performance of the S&P 500 (SNPINDEX: ^GSPC). In the past 10 years, the widely followed benchmark has produced a total return of 351% (as of Feb. 12). This translates to a stellar annualized gain of 16%, which is significantly higher than the long-term average of 10%.
However, the stock market today is flashing a clear warning to investors. Here’s what history says could happen next.