We subsidize ethanol so we can use it instead of gasoline in our cars. The price of corn rises. Poor folk in Mexico can’t afford their staple food:

Mexico is in the grip of the worst tortilla crisis in its modern history. Dramatically rising international corn prices, spurred by demand for the grain-based fuel ethanol, have led to expensive tortillas. That, in turn, has led to lower sales for vendors such as Rosales and angry protests by consumers.