César Alejandro González López sells elotes (corn on the cob) and esquites (corn in a cup) every afternoon on a street corner in Acayuca, in the central Mexican state of Hidalgo. López, who uses a loudspeaker to attract customers, says that earlier this year, his elotes cost 8 Mexican pesos (40 cents). They now cost 20 pesos ($1), and he provides fewer limes with each order.