Rural workers are dependent on agricultural wage labor, especially in coffee and cotton. Only a small fraction hold permanent jobs. Most are migrants who follow crops during the harvest period and find other work during the off-season. The "lower" peasants are typically smallholders without sufficient land to sustain a family; they also join the harvest labor force. The "upper" peasants have sufficient resources to be economically independent. They produce enough surplus, beyond their personal needs, to allow them to participate in the national and world markets.