The S&P 500 Has Returned an Average of 12.2% Annually Over the Past 10 Years. Here Is What History Says May Happen Over the Next Decade
A potential wild card is on the horizon.

Looking for the safest way to build wealth in the stock market?
It's hard to beat the S&P 500 (SNPINDEX: ^GSPC), the most popular barometer for the U.S. stock market, which returns roughly 10% annually on average to shareholders. The S&P 500 is an index of 500 prominent U.S. companies. It's performed well for so long that even most professional investors can't consistently beat the index by making their own selections.
The past decade has been especially prosperous -- the S&P 500 has returned an average of 12.2% annually.