EDC is an aggressive one-day bet on the widely followed MSCI Emerging Markets Index. The fund promises to provide 300% of the return of the index, which is a cap-weighted composite of emerging markets firms covering 85% of the market cap in those countries every day. This means heavy exposure to financials and technology, as well as to firms in China, South Korea, and Taiwan. As with most leveraged funds, it's designed to provide this exposure only for one trading day. Holding the fund for longer than one day will expose investors to the effects of compounding and may create significant drift between the expected return and what is actually realized. Also, consider that EDC is designed to be a short-term trading vehicle, not a long-term investment, so trading costs have a bigger impact than the expense ratio.