Food security research in Southern Africa: policy implications.

agricultural policies budget familial cash crops comercio commerce common lands consommation alimentaire consumer expenditure consumo de alimentos consumo familiar cultivos comerciales cultivos de grano culture de rapport diversification economic policies exportaciones exportation exports family budget farm inputs food consumption food security ganado gastos de consumo grain grain crops granos hogares household consumption households importaciones importation imports income insumos agricolas livestock marketing policies moyen de production agricole politique agricole politique des prix precio al productor precios presupuesto familiar price policies prices prix producer prices recherche renta research revenu rural areas seguridad alimentaria technology transfer terre communale tierras comunales trade transfert de technologie zimbabwe zonas rurales zone rurale