Checking Your Portfolio Daily

Checking your portfolio daily is the single fastest way to destroy returns, backed by Nobel Prize-winning research from Benartzi and Thaler (1995). Their study proved that investors who checked monthly made worse decisions than those who checked annually, because frequent exposure to visible losses triggers panic selling. In a typical year, the S&P 500 posts negative daily returns about 46% of the time, yet positive returns on roughly 63% of months, 75% of years, and 95% of rolling 20-year periods. This means the more frequently you look, the more losses you see, and the more likely you are to act irrationally. The worst offenders, daily checkers, underperform #9's typical buy-and-hold investor by an estimated 2-3 percentage points annually due to ill-timed trades. The data is clear: the less you look, the better you perform. Set it and forget it isn't lazy—it's the optimal strategy backed by decades of evidence.