| Sumario: | The sum over individuals of the differentials of demand functions is the basic starting point of the Rotterdam model. In this paper, we show that this global differential can be inverted. Moreover, it can be parametrized according to the lines of the Rotterdam model. Consequently, we have two complete specifications in order to analyse demand and they compete on a priori grounds. After discussing the characteristics of each model relative to the stochastic assumptions used for its estimation, the structure of substitution-complementarity that it allows and its power for Computational Economics, we estimate both models and compare their results.
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