FEELING the need for an example of government policy run amok? Look no further than the box of cornflakes on your kitchen shelf. In its myriad corn-related interventions, Washington has managed simultaneously to help drive up food prices and add tens of billions of dollars to the deficit, while arguably increasing energy use and harming the environment.

Even in a crowd of rising food and commodity costs, corn stands out, its price having doubled in less than a year to a record $7.87 per bushel in early June. Booming global demand has overtaken stagnant supply.

But rather than ameliorate the problem, the government has exacerbated it, reducing food supply to a hungry world. Thanks to Washington, 4 of every 10 ears of corn grown in America — the source of 40 percent of the world’s production — are shunted into ethanol, a gasoline substitute that imperceptibly nicks our energy problem. Larded onto that are $11 billion a year of government subsidies to the corn complex.

Corn is hardly some minor agricultural product for breakfast cereal. It’s America’s largest crop, dwarfing wheat and soybeans. A small portion of production goes for human consumption; about 40 percent feeds cows, pigs, turkeys and chickens. Diverting 40 percent to ethanol has disagreeable consequences for food. In just a year, the price of bacon has soared by 24 percent.