Estrutura de oferta e desenvolvimento agrícola: um modelo de equações recursivas

Abstract

The basic hypothesis of this research is test farm supply elasticity varies between types of farming an between types of product. The empirical testing of that hypothesis is based upon a recursive model of acreage and yield responses allowing for acreage-yield interaction. Time series data (1947-77) and ordinary least squares were used and Chow's test was applied for comparison among supply elasticities. The empirical evidence indicates the impossibility of establishing a general ordering of acreage and yield response elasticities according to types of agriculture and types of products (modern, tradicional, frontier and subsistence, market agriculture). Results also point out that acreage response elasticity is not always a lower limit of supply elasticity. Nonetheless, price policy should allow for differences in supply structure among types oj jarming and output orientation.