If you are heavily invested in a single stock, whether it's Pets.com, Bear Stearns, or Tesla, then you aren't aiming for average returns. Index funds are a low

If you are heavily invested in a single stock, whether it's Pets.com, Bear Stearns, or Tesla, then you aren't aiming for average returns. Index funds are a low effort way to spread risk and are simple to use. The real problem is that most people lack the discipline to avoid panic selling or to avoid chasing bigger wins.