There may be worse inflation to come. Food experts say steep increases in commodity prices have not fully made their way to street stalls in the developing world or supermarkets in the West.

Governments in many poor countries have tried to respond by stepping up food subsidies, imposing or tightening price controls, restricting exports and cutting food import duties.

These temporary measures are already breaking down. Across Southeast Asia, for example, families have been hoarding palm oil. Smugglers have been bidding up prices as they move the oil from more subsidized markets, like Malaysia’s, to less subsidized markets, like Singapore’s.

No category of food prices has risen as quickly this winter as so-called edible oils  with sometimes tragic results. When a Carrefour store in Chongqing, China, announced a limited-time cooking oil promotion in November, a stampede of would-be buyers left 3 people dead and 31 injured.

Image A PRECIOUS COMMODITY In Mumbai, Rajkanya Kawle, 11, held palm oil for her familys dinner. The 250 milliliters of oil cost 16 rupees, about 41 cents. Credit... Michael Rubenstein for The New York Times

Cooking oil may seem a trifling expense in the West. But in the developing world, cooking oil is an important source of calories and represents one of the biggest cash outlays for poor families, which grow much of their own food but have to buy oil in which to cook it.

Few crops illustrate the emerging problems in the global food chain as well as palm oil, a vital commodity in much of the world and particularly Asia. From jungles and street markets in Southeast Asia to food companies in the United States and biodiesel factories in Europe, soaring prices for the oil are drawing environmentalists, energy companies, consumers, indigenous peoples and governments into acrimonious disputes.