We’ve all heard this stock-market cliché: “What goes up must go down.” But what goes down may only go down a small amount — or for only a short period — before the resumption of an upward climb. Amazon.com AMZN, +0.85 provides a wonderful example, as its shares have dropped 10% from their peak closing level on July 26 through the close on Aug. 25. Check out this 10-year stock chart: via