Should You Invest in the S&P 500 Right Now or Wait? History Offers a Clear Answer.
The S&P 500 (^GSPC -1.21%) has soared higher over the past few months, putting the famous stock market index up 18% over the past year. At approximately 20.4 times expected earnings, the S&P 500 has become notably more expensive than its 30-year average of 17.2.