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.

Change was coming to the great grain exchanges of Chicago, Minneapolis, and Kansas City — which for 150 years had helped to moderate the peaks and valleys of global food prices. Farming may seem bucolic, but it is an inherently volatile industry, subject to the vicissitudes of weather, disease, and disaster. The grain futures trading system pioneered after the American Civil War by the founders of Archer Daniels Midland, General Mills, and Pillsbury helped to establish America as a financial juggernaut to rival and eventually surpass Europe. The grain markets also insulated American farmers and millers from the inherent risks of their profession.

The basic idea was the “forward contract,” an agreement between sellers and buyers of wheat for a reasonable bushel price — even before that bushel had been grown. Not only did a grain “future” help to keep the price of a loaf of bread at the bakery — or later, the supermarket — stable, but the market allowed farmers to hedge against lean times, and to invest in their farms and businesses. The result: Over the course of the 20th century, the real price of wheat decreased (despite a hiccup or two, particularly during the 1970s inflationary spiral), spurring the development of American agribusiness. After World War II, the United States was routinely producing a grain surplus, which became an essential element of its Cold War political, economic, and humanitarian strategies — not to mention the fact that American grain fed millions of hungry people across the world.

Futures markets traditionally included two kinds of players. On one side were the farmers, the millers, and the warehousemen, market players who have a real, physical stake in wheat. This group not only includes corn growers in Iowa or wheat farmers in Nebraska, but major multinational corporations like Pizza Hut, Kraft, Nestlé, Sara Lee, Tyson Foods, and McDonald’s — whose New York Stock Exchange shares rise and fall on their ability to bring food to peoples’ car windows, doorsteps, and supermarket shelves at competitive prices. These market participants are called “bona fide” hedgers, because they actually need to buy and sell cereals.

On the other side is the speculator. The speculator neither produces nor consumes corn or soy or wheat, and wouldn’t have a place to put the 20 tons of cereal he might buy at any given moment if ever it were delivered. Speculators make money through traditional market behavior, the arbitrage of buying low and selling high. And the physical stakeholders in grain futures have as a general rule welcomed traditional speculators to their market, for their endless stream of buy and sell orders gives the market its liquidity and provides bona fide hedgers a way to manage risk by allowing them to sell and buy just as they pleased.

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