S&P GSCI

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The S&P GSCI (formerly the Goldman Sachs Commodity Index) serves as a benchmark for investment in the commodity markets and as a measure of commodity performance over time. It is a tradable index that is readily available to market participants of the Chicago Mercantile Exchange. The index was originally developed in 1991, by Goldman Sachs. In 2007, ownership transferred to Standard & Poor's, who currently own and publish it. Futures of the S&P GSCI use a multiple of 250. The index contains a much higher exposure to energy than other commodity price indices such as the Bloomberg Commodity Index.

Contents

Index composition

The S&P GSCI contains as many commodities as possible, with rules excluding certain commodities to maintain liquidity and investability in the underlying futures markets. The index currently comprises 24 commodities from all commodity sectors - energy products, industrial metals, agricultural products, livestock products and precious metals. The wide range of constituent commodities provides the S&P GSCI with a high level of diversification, across subsectors and within each subsector. 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.

The diversity of the S&P GSCI's constituent commodities, along with their economic weighting allows the index to respond in a stable way to world economic growth, even as the composition of global growth changes across time. When industrialised economies dominate world growth, the metals sector of the GSCI generally responds more than the agricultural components. Conversely, when emerging markets dominate world growth, petroleum-based commodities and agricultural commodities tend to be more responsive.

Economic weighting

The S&P GSCI is a world-production weighted index that is based on the average quantity of production of each commodity in the index, over the last five years of available data. This allows the S&P GSCI to be a measure of investment performance as well as serve as an economic indicator.

Production weighting is a quintessential attribute for the index to be a measure of investment performance. This is achieved by assigning a weight to each asset based on the amount of capital dedicated to holding that asset just as market capitalisation is used to assign weights to components of equity indices. Since the appropriate weight assigned to each commodity is in proportion to the amount of that commodity flowing through the economy, the index is also an economic indicator.

Controversy

Leah McGrath Goodman, a reporter with experience covering commodities markets, described an experience writing about the Goldman Sachs Commodities Index in her book "The Asylum". Around 2007, she wrote an article for the Futures Industry Association trade magazine about the indexes. She concluded the massive amount of money in the indexes following the oil futures market dwarfed the actual oil futures market, by around 5 to 1. She alluded to the theories of Milton Friedman, who believed that inflation was caused by "too many dollars chasing after too few goods". She concluded that the indexes were apparently thus causing oil prices to rise. 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. For example, the report points out that even commodities without futures markets also saw price rises during the period. [2] However, counter-arguments have been made that the commodities without futures markets saw their prices rise as a consequence of the rising prices of commodities with futures markets: the World Development Movement, a social justice lobbying organization, states there is strong evidence that the rising price of wheat caused the price of rice to subsequently rise.

Components and weights

S&P GSCI Components and Dollar Weights as of May 7, 2020 [3]
Energy61.71%Industrial Metals10.65%Precious Metals4.50%Agriculture15.88%Livestock7.25%
WTI Crude Oil 25.31%LME Aluminium3.69%Gold4.08%Chicago Wheat2.85% Live Cattle 3.90%
Brent Crude Oil 18.41% LME Copper 4.36%Silver0.42%Kansas Wheat1.25% Feeder Cattle 1.30%
RBOB Gasoline4.53%LME Lead0.68%Corn4.90% Lean Hogs 2.05%
Heating Oil4.27% LME Nickel 0.80%Soybeans3.11%
Gasoil5.95%LME Zinc1.12%Cotton1.26%
Natural Gas3.24%Sugar1.52%
Coffee0.65%
Cocoa0.34%

See all

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References

  1. ↑ The Asylum, Leah McGrath Goodman, 2011, Harper Collins, p 327- 328
  2. ↑ Clearing the usual suspects, Buttonwood, The Economist, 2010 6 24
  3. ↑ "S&P GSCI Methodology" (PDF). S&P Dow Jones Indices. S&P Global. p. 26. Retrieved 2020-05-06.
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