The Inverse Product Differentiation Logit Model
55 Pages Posted: 20 Mar 2018 Last revised: 1 Dec 2022
Date Written: November 29, 2022
We introduce the inverse product differentiation logit (IPDL) model, a micro-founded inverse market share model for differentiated products that captures market segmentation according to one or more characteristics. The IPDL model generalizes the nested logit model to allow richer substitution patterns, including complementarity in demand, and can be estimated by linear instrumental variables regression using market-level data. Furthermore, we provide Monte Carlo experiments that compare the IPDL model to the workhorse empirical models of the literature. Lastly, we show the empirical performance of the IPDL model using a well-known dataset on the ready-to-eat cereals market.
Keywords: Demand estimation; Demand invertibility; Differentiated products; Discrete choice; Nested logit; Random utility; Representative consumer
JEL Classification: C26, D11, D12, L
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