U.S. markets finished 2015 mostly in the red: The Dow was down 2.2%. The S&P 500 ended the year down 0.7%. It was the worst year for those two indexes since markets collapsed in 2008. The Nasdaq finished 2015 up 5.7%. However, it had double digit gains in the three years prior. Volatility thrashed investors left and right in 2015. The three big concerns this year were falling oil prices, China's economic slowdown and the seemingly never ending speculation about when the Federal Reserve would raise interest rates. Greece's debt crisis, the European Central Bank's stimulus plan and fears of a broader slowdown in ... (full story)