In a few decades, drinking water in northern Mexico will become expensive. The rural poor especially in the south and in dispersed Indian communities poses a well publicized social dilemma involving lack of rural communication and of course lack of education. The "indigenous" problem is finding a job in the city without an education. How does salary relate to height & weight? See Malacara & Ramírez-Estrada (1981) and Avila-Curiel et al. (1998).