Did you know the stock market’s average return is about 10% per year? That’s what an investor buying an S&P 500 index fund could expect to earn over the long term. Not too bad, right? In fact, you’ll tend to beat more than 80% of professional investors in any given year using this simple buy-and-hold...The article Take the Smart Investor’s Vow: to Buy and to Hold originally appeared on NerdWallet.