Production of corn in Mexico increased since NAFTA. However, internal demand for corn had increased beyond Mexico's supply to the point where imports became necessary, far beyond the quotas Mexico originally negotiated. Zahniser & Coyle pointed out that corn prices in Mexico, adjusted for international prices, have drastically decreased, but through a program of subsidies expanded by former president Vicente Fox, production remained stable since 2000. Reducing agricultural subsidies, especially corn subsidies, was suggested as a way to reduce harm to Mexican farmers.