Here is a chart of the index value for the S&P 500 and the United Kingdom's main equity index, the FTSE 100, from the end of 2008 to early 2015. The labels have been removed. One index has clearly outperformed the other. Over this period, there was a technology boom and an oil crash. Here are pie charts showing the early 2015 index compositions by industry for both the S&P 500 and the FTSE 100. Which index outperformed