Brazil has ten million rural poor who have no access to land. They have formed a movement of the landless that has come under severe attacks from private armies under pay by landowners. The commercialization of agriculture to produce cash crops produces pressures that tend to drive peasnats off the land. Staple crops are not grown and the prices of food increases. Poor farmers cannot afford food.
Commercialization also drives up the price of land making access to it even less likely.
Government policies tend to favor urban groups by requiring peasants to produce food at very low prices to keep urban food prices low. Thus the peasants are condemned to poverty because prices are set too low. Many stop farming. This has been the pattern especially in parts of Africa. Land reform is offered as a solution.