Investors rightly depend on diversification across asset classes to help shield them from market downturns. In 2008, however, the credit crunch hit nearly all assets hard, and not even bond funds were able to offer much protection (with the exception of government bonds or funds with heavy foreign currency exposure). Should this change the way investors think about diversification? Morningstar US Associate Director of Fund Analysis Lawrence Jones discusses this topic with Robert Arnott, chairman and founder of Research Affiliates, in this video. Press play on the clip below to watch.