The USO is completely broken, lagging the actual price of crude oil by over 40% since inception. Recommending this type of investment or believing that they work is nothing short of criminal.
Just so you know, the historical ratio from 1980 to now is about 8.5:1 which accounts for the fact that the two commodities are not perfect substitutes. I agree that natural gas is definitely undervalued, but the short term fundamentals for natural gas are worse than that of crude oil because the U.S. is receiving a ton of LNG shipments. Over time this will move back to normal and both commodities will appreciate heavily.
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