How To Retain Your Sanity In A Volatile Market

In the long term, stocks outperform bonds and bonds outperform cash. Can you name a 20-year period over the past 100 years when they didn't? Unfortunately this is something that many people forget as soon as the markets get ugly. People forgot in 1974, 1987, 2002 and 2008 as they panicked and sold, only to miss a recovery in prices. Why does this happen?