The stock market Wednesday could achieve its longest stretch of growth since March 2000. We're experiencing a bull market, which happens when the stock market grows a continuous rate without a dip of 20 percent. The S&P 500 reached an all-time high Tuesday, closing at more than 2,862 points. CBS News financial contributor Mellody Hobson joins "CBS This Morning" to break down what's behind the bull market and its limitations.
