This diversity mutes the impact of highly idiosyncratic events, which have large implications for the individual commodity markets, but are minimised when aggregated to the level of the S&P GSCI.
When industrialised economies dominate world growth, the metals sector of the GSCI generally responds more than the agricultural components.
Her article was dropped after a man from the FIA magazine showed it "to people around Washington" and told her it would be "politically explosive".
[1] However, in a June 26, 2010 article in The Economist, the argument is made that Index-tracking funds (of which Goldman Sachs Commodity Index was one) did not cause the bubble.
It describes a report by the Organisation for Economic Co-operation and Development that used data from the Commodity Futures Trading Commission to make the case.