
"These crowd madnesses recur so frequently in human history that they must reflect some deeply rooted trait of human nature. … There seems to be a cyclical rhythm in these movements. A bull market, for example, will be sweeping along and then something will happen — trivial or important — and first one man will sell and then others will sell and the continuity of thought toward higher prices is broken."
— Bernard Baruch, My Own Story, 1957