Commodities as an Investment

"Interest in commodities has grown tremendously, partly because
commodities are believed to provide direct
exposure to unique factors and have special hedging characteristics.
This review discusses the instruments
that provide exposure to commodities, the measures and historical
record of commodity investment
performance, evidence about the benefits of strategic versus tactical
commodity allocations, and recent
developments in the market"

Here is the full publication available free from The Research
Foundation of CFA Institute Literature Review

http://www.cfapubs.org/doi/pdfplus/10.2470/rflr.v6.n2.1

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Thanks
BD