Barring the outbreak of internecine conflict in Central America, the greatest challenge to the Nicaraguan Revolution lies in rural Nicaragua. As in most developing countries, the severest poverty in Nicaragua has always been found in the rural areas. Somewhat paradoxically, however, the rural areas of the country are also the source of the nation's wealth: 90 percent of the foreign exchange, so necessary to a small state like Nicaragua, is derived from agriculture. Moreover, around 70 percent of the population earn their living from the land. Consequently, meeting the promises of the revolution depends crucially on the performance of the agricultural sector.