Some say money is the root of all evil; others say lack of money. But the original sentiment, supposedly expressed by St. Augustine, was that “love of money” or “greed” was the culprit. In the stock market, where the twin emotions of fear and greed have long ruled, this is often true. Greed is what entices amateurs to enter the market near bull market tops. Greed is what makes people buy on margin when they can’t handle the risk. And greed is what drives people to invest in stocks they don’t understand.