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What is the standard deviation and mean return of oil?
Your question is a moving target. And my answer will be subject to revision. I disagree with the votes to close, as you are asking (imho) what role commodities and specifically oil, play in one's asset allocation. Right? How much may be opinion, but there's a place to ask if.  I'm looking at this chart, and thinking, long term, the real return is zero. The discussion regarding gold has been pretty exhausted. For oil, it's not tough to make the case that it will fluctuate, but long term, there's no compelling reason to believe its price will rise any faster than inflation over the really long term.