Savvy Trades and Investments

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Wonder if you can short those? I remember a few years ago having what I thought was a great idea...short both a double long ETF and double short ETF equally. They should offset each other, while you make money on the decay. I tried doing that for a few months. Made a few dollars, but didn't like having so much tied up to make a small gain. If you had millions to make such a trade, seems like a sure bet.