Market timing seems simple enough: buy when prices are low and sell when prices are high. But there is clear evidence that time-to-market is difficult. Investors often sell stocks early, missing out on an opportunity for the stock market to rise. Investing when the market is flashing red can also be frustrating.  On the contrary, investing through highs and lows brings competitive returns, especially over longer periods. The figure above shows how trying to time the market can drive down the value of your portfolio using 20 years of JP Morgan data.  Portfolio...