Testing non-nested demand relations: linear expenditure system versus indirect addilog
AbstractIn applied economic research computable general equilibrium [CGE] models in which the behavior of economic agents are modeled, are widely used. In many CGE models, the Linear Expenditure System [LES] is used to model behavior of the household sector. The disadvantage of LES is that the Engel curves, describing the relationship between expenditure on a certain commodity and total expenditure, are straight lines. Moreover, the LES does not allow for the existence of inferior commodities, elastic demand and gross substitution. An alternative model for the household block is the Indirect Addilog System [IAS] which is as simple to implement as LES, but which does not suffer from these theoretical deficiencies. Consequently, IAS provides a theoretically richer description of household behavior than LES, while it is as easy to implement.In this paper we test the LES specification against the IAS specification in case one disposes of a budget survey. It is not possible to use a standard likelihood ratio test as both models are not nested. We propose to use the likelihood ratio test for non-nested hypotheses due to Vuong (1989), or, alternatively, the distribution-free test due to Clarke (2007). We apply both tests to the Palestinian Expenditure and Consumption Survey (PECS, 2005) and find that there is overwhelming evidence that the IAS specification is to be preferred to the LES specification.
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Bibliographic InfoArticle provided by Netherlands Society for Statistics and Operations Research in its journal Statistica Neerlandica.
Volume (Year): 63 (2009)
Issue (Month): 3 ()
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Web page: http://www.blackwellpublishing.com/journal.asp?ref=0039-0402
Other versions of this item:
- Boer, P.M.C. de & Paap, R., 2009. "Testing Non-nested Demand Relations: Linear Expenditure System versus Indirect Addilog," Econometric Institute Report EI 2009-07, Erasmus University Rotterdam, Econometric Institute.
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- Paul de Boer, 2010. "Modeling Household Behavior in a CGE Model: Linear Expenditure System or Indirect Addilog?," DEGIT Conference Papers c015_059, DEGIT, Dynamics, Economic Growth, and International Trade.
- Boer, P.M.C. de, 2009. "Modeling household behavior in a CGE model: linear expenditure system or indirect addilog?," Econometric Institute Report EI 2009-16, Erasmus University Rotterdam, Econometric Institute.
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