sentences:  By the early 1970s, fundamental issues were emerging in the industrial and agricultural sectors of Mexico's economy.Regional underdevelopment, technological shortages, lack of foreign competition, and uneven distribution of wealth led to chronic underproduction of investment and capital goods, putting the long-term future of Mexican industry in doubt.Meanwhile, ubiquitous poverty combined with a dearth of agricultural investment and infrastructure caused continuous migration from rural to urban areas; in 1971, Mexican agriculture was in such a state that the country had become a net importer of food.