By March 2014 the U.S. stock market has seen 5 years of gains since the low reached in 2009. The Dow Jones Industrial Average (DJIA) increased 151% since March 9, 2009, when it hit a low with the global financial crisis. The Dow was at 16452 on March 7, 2014, the S&P 500 at 1878. This makes it the fifth longest running-comparable to the one after 1987- and the fifth in gains since 1900, according to Ned Davis Research. S&P 500 trades at 16 times component companies earnings for the past year, according to the FactSet, similiar to the level at which stocks peaked in 2007. Using a measure developed by Robert Shiller with a 10 year average of earnings gives a P/E ratio of 25 times earnings, compared to historical average of 16.5, and 27.5 in 2007. Shiller's measure reached its current level in 2003 before the bull market ended in 2007. The biggest support for the stock market has been Federal Reserve support by buying $3 trillion in bonds in the open market since 2008. This support is gradually being reduced as the economy recovers....