Don't Make This Common Investing Mistake When Buying S&P 500 Stocks at All-Time Highs

At the time of this writing, the S&P 500 (SNPINDEX: ^GSPC) is less than half a percentage point off its all-time high. With a 9.7% year-to-date gain, the index is on track to have another solid year, despite a brutal sell-off earlier this spring.The S&P 500 is now up over threefold in the last decade and more than 50% in the last three years -- which may make some investors hesitant to buy stocks at all-time highs. Here's the best way to approach investing in the stock market at elevated levels, including a major mistake worth avoiding.Image source: Getty Images.Continue readingWeiter zum vollständigen Artikel bei MotleyFool Weiter zum vollständigen Artikel bei MotleyFool