Even Islamists have to eat. It is unclear whether President Hosni Mubarak of Egypt will survive, or whether his nationalist regime will be replaced by an Islamist, democratic, or authoritarian state. What is certain is that it will be a failed state. Amid the speculation about the shape of Arab politics to come, a handful of observers, for example economist Nourel Roubini, have pointed to the obvious: Wheat prices have almost doubled in the past year. Egypt is the world's largest wheat importer, beholden to foreign providers for nearly half its total food consumption. Half of Egyptians live on less...