Investors might want to take advantage of the stock market's recent pessimism.Investors have been hit with some turmoil in recent days. Soft U.S. economic data, an interest rate hike in Japan, and Berkshire Hathaway's aggressive selling have resulted in notable declines over the past week for the S&P 500 and the Nasdaq Composite index.However, astute investors understand that volatility is par for the course when it comes to achieving solid long-term returns. In fact, the sell-off might present lucrative op ...