Frederick Kaufman writes that Wall Street's at fault for the spiraling cost of food.

Demand and supply certainly matter. But there's another reason why food across the world has become so expensive: Wall Street greed.

It took the brilliant minds of Goldman Sachs to realize the simple truth that nothing is more valuable than our daily bread. And where there's value, there's money to be made. In 1991, Goldman bankers, led by their prescient president Gary Cohn, came up with a new kind of investment product, a derivative that tracked 24 raw materials, from precious metals and energy to coffee, cocoa, cattle, corn, hogs, soy, and wheat. They weighted the investment value of each element, blended and commingled the parts into sums, then reduced what had been a complicated collection of real things into a mathematical formula that could be expressed as a single manifestation, to be known henceforth as the Goldman Sachs Commodity Index (GSCI).

For just under a decade, the GSCI remained a relatively static investment vehicle, as bankers remained more interested in risk and collateralized debt than in anything that could be literally sowed or reaped. Then, in 1999, the Commodities Futures Trading Commission deregulated futures markets. All of a sudden, bankers could take as large a position in grains as they liked, an opportunity that had, since the Great Depression, only been available to those who actually had something to do with the production of our food.