“The good news for investors is that S&P has done a pretty good job of capturing the winners while weeding out the losers, as reflected by the fact that the index continues to trend higher.”– Sam RoThe stock market and broad market indices, such as the S&P 500, are not static.The stocks that comprise the market are constantly changing as companies grow, shrink, merge, privatize, or go bellyup."On average, 20% of S&P 500 constituents turn over every five years," Goldman Sachs' Ben Snider wrote in his Jan. 6 ...