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Can you beat the market by investing in double long ETFs? [duplicate]
If the index goes up every single day during your investment, you would indeed be better off with 2x ETFs, assuming no tracking errors. However, this is basically never the case. Indexes fluctuate up and down. And the problem is, with these sorts of ETFs, you double your win on the upside but your downside is more than double. If an index goes up 10% one day and down 10% the next, you lose 1% of the value of your investment (1.1 * 0.9). If you are using 2x ETFs, you lose 4% of the value of your investment (1.2 * 0.8), not 2%. If you are using 3x ETFs, you lose 9% of the value of your investment (1.3 * 0.7), not 3%. So, if the index will continue to rise during your holding period, yes, you are better off with these 2x or 3x ETFs. If the index falls on some days, but rises most other days, the added downside is all but certain to make you lose money even though the stock trends upward. That's why these ETFs are designed for single-day bets. Over the long-term, the volatility of the stock market, combined with your exponentially increased downside, guarantees you will lose money.