The province of Nueva Ecija may be divided into three potential sustainable districts based on the following criteria: ECONOMIC: The population is large enough to achieve some scale economics and to stimulate internal trade. Each district is composed of approximately 200,000 to 300,000 people. Each district exhibits a sufficient mix of factor endowments in production, processing and exchange for self-reliance and self-production. The traditionally defined market centers in the province are Gapan, Cabanatuan City, Guimba, Talavera and San Jose City.