"[Commodities] are experiencing demand shock from a new category of speculators: institutional investors like corporate and government pension funds, university endowments, and sovereign wealth funds," said Michael Masters, managing member of Masters Capital Management, a Virgin Islands-based hedge fund. "Index speculators are the primary cause of the recent price spikes in commodities."

…Masters distinguished between traditional speculators and what he calls index speculators, or passive investors who enter the commodities markets as a long-term hedge against inflation. Commodities exchanges limit the number of positions an investor can take in the market, but Masters says the Commodity Futures Trading Commission has allowed unlimited speculation in these markets through a loophole.

Speculative activity in commodity markets has grown dramatically over the last several years. In the past decade, the share of long interests—positions that benefit when prices rise—held by financial speculators has grown from one-quarter to two-thirds of the commodity market. In only five years, from 2003 to 2008, investment in index funds tied to commodities has grown twentyfold, from $13 billion to $260 billion.