Food riots and revolution: Grain prices predict political instability

``People may vote with their pocketbooks, but more often than not, they revolt with their bellies. If you want to predict where political instability, revolution, coups d'etat, or interstate warfare will occur, the best factor to keep an eye on is not GDP, the human development index, or energy prices... Egypt's revolution, in particular, is impossible to fully understand without taking into account the role of food.''