Holding broad US stocks compounds returns; crash selling and overtrading destroy that advantage. Most would be dramatically richer holding quality stocks or the market for life. The S&P 500 has compounded roughly 10% a year with dividends reinvested; DALBAR's studies show investors lag by 1-3 percentage points or more annually from behavior. Random stock buy-and-hold usually fails: durable quality or broad diversification captures the few firms creating almost all wealth. x.comÂ