The document summarizes an article by Jeffrey Saut discussing the behavior of retail investors over the course of bull markets. It notes that retail investors tend to sell stocks too early after price increases, repurchase the same stocks at even higher prices, and hold on too long during market declines. The article cites a 1917 book that documented this behavior and concludes it still persists today. It warns that with the current bull market in its mature stage, retail investors following these typical patterns could see their stocks continue rising in the short term but face losses if the market declines.