May stock investors live and profit by a particular set of investment rules? Though the writer missed on his stock market and economic call - he purports in this article an investing system that has held up well through the test of time. He writes that the momentum indicator on a twenty year monthly chart of the S&P 500 crossed below zero only five times in the last twenty years. Two of those times were just prior to the important bear markets in 2000 just after the dot-com mania burst and after the major market top at the end of 2007.