San Salvador disproportionately concentrates economic activity in the country. The metropolitan area accounts for 3% of the national territory but 70% of public and private investment is made there. The economy of San Salvador, Antiguo Cuscatlán, and Santa Tecla is a mixed one composed mainly of services, private education, banking, business headquartering, and industrial manufacturing. Other municipalities in the metropolitan area depend either on industry, like Soyapango and Ilopango, on public services, like Mejicanos, or on power generation, as in Nejapa and Apopa. The other municipalities have not developed their own economies, however, they have provided the workforce required for industry in neighboring municipalities.