Engel Curves Specification in an Artificial Model of Consumption Dynamics with Socially Evolving Preferences
In studying individual consumption behavior, an important issue is the analysis of the relation between commodity expenditure and income (or total expenditure). In this paper we firstly review the more recent theoretical and empirical literature attempting to: (i) derive theory-consistent demand systems models which are able to account for empirically observed non-linearities in total expenditure; (ii) find out whether there exist necessary and sufficient conditions on the across-households distributions such that empirically obtained demand functions still preserve a strong consistency between micro and macro parameters (e.g. consumption-income elasticities). We then apply the techniques discussed in the first part of the paper to the data generated by a computer-simulated model of consumption dynamics presented in Aversi et al. (1999). We find that the model, under a large range of parametrizations, is pretty well equipped to replicate most of the stylized facts displayed by empirically observed consumption patterns, both cross-section and across time.
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