| http://www.w3.org/ns/prov#value | - Investors wanting to bet on prices rising need to sell the cheaper, expiring contracts at the end of each month and buy more expensive futures, reducing gains because of what???s known as a negative roll yield.Bullish investors can avoid this conundrum by instead buying a combination of oil-related equities and currencies including the Canadian dollar or Mexican peso, according to the French bank,
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