Economic model for establishing priorities for agricultural research and a test for the Brazilian economy
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The specific objectives of the present study were to: (1) develop an analytical framework which provides a basis for establishing agricultural research priorities, (2) develop empirical models which contain the relevant parameters and which can be estimated from available data, or for which parameters can be taken from other sources, (3) estimate the appropriate parameters, determine changing resource scarcities, and evaluate recent technical change in Brazil, (4) draw implications and make recommendations for the allocation of research resources in Brazil.
Ramalho de Castro, Jose Prazeres · 1970

Abstract
The analytical framework is based on the concepts of consumers" and producers" surplus, on the theory of the functional distribution of income, and on a two-sector general equilibrium model. The surplus concepts provide a means of evaluating the extent to which a gain from a technological change is divided among consumers and producers. The neoclassic theory of the functional distribution of income is extended to allow an analysis for four factors of production.
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