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If you want to trade an equity that reflects changes in VIX, what is a good proxy for it?
I'd look at VXX, I believe it closely tracks what you are looking to do. http://www.ipathetn.com/product/VXX/ However, as already noted in other responses, this isn't trading VIX itself (in fact it is impossible to do so).  Instead, this ETF gives exposure to short-term SP500 futures contracts, which in theory should be very correlated to market volatility.