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In 2015, why has the price of natural gas been plummeting?
You do not hold leveraged ETF for longer than a few days.  You have UGAZ and DGAZ, both 3x leveraged, one longs one shorts.  What happens if you buy both? You don't get 0% return. In fact, you get -10% return if you hold both for 3 months.   No matter what happens, they both go down in long term.  Call it Leverage Decay, Beta Slippage, Contango, Rollover, etc.  If you want to gamble that NG goes up within 3 days, go ahead. Just be prepared for the worst cases like losing 15% in 3 days.  If you want to speculate the NG will recover in a year, buy Natural Gas industry ETF http://www.ftportfolios.com/retail/etf/etfsummary.aspx?Ticker=FCG