Oil futures dropped early Tuesday, as falling stocks and concerns about the global economy weighed on investor sentiment. Crude oil for March delivery fell 71 cents, or 2%, to $36.80 a barrel in electronic trading on Globex. "Oil markets are likely to remain vulnerable to further losses, with risk aversion on the rise and as bulls lose hope for a swift recovery in global economies following an array of negative economic data recently," said Nimit Khamar, an analyst at Sucden Financial Research.

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