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The crude oil tanker, Chemtrans Cancale, is seen anchored off shore as it waits to dock at Port Everglades on April 20, 2020 in Fort Lauderdale, Florida.

"Know what you own" is an old adage when investing, but it is especially important when owning investments that hold futures contracts.

 Just look at the largest oil ETF, the United States Oil Fund (USO).  Many retail investors mistakenly believe this is a proxy for investing in the "spot" (cash) price for oil.

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