The difference is in the detail

Potential investors should understand how the Dow Jones, Diapason Commodities Management and Standard & Poor's commodity indices are compiled before deciding which one to use, Sara Utecht reports

Investors who are looking to invest in commodities should be aware that while all of the three main commodity indices claim to offer a neutral and diversified exposure, they vary significantly in their constituent weightings.

Dow Jones AIG's Commodity Index, Diapason CM's Diapason Commodities Index (DCI) and S&P's GSCI all produce commodity indices, but provide different exposures.

John Prestbo, editor and executive director of Dow Jones Indices, says, "Our weightings are based on a combination of

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