Investing according to Sharia, the Islamic law that covers topics ranging from crime to economics to hygiene, is like dealing with any client who has rules: You follow them. However, the rules are strict, and they differ all over the world. In the 1990s the performance of our Sharia funds tended to be in the middle of the pack because the U.S. was shifting from industrial to financial businesses and we can't own financial stocks. Because of that, though, we've done better over the past decade.
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