Revealed Preference Tests for Price Competition in Multi-product Differentiated Markets

Yuta Yasui ()
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Yuta Yasui: School of Economics and Management, Kochi University of Technology

No SDES-2021-14, Working Papers from Kochi University of Technology, School of Economics and Management

Abstract: Assumptions of competitive structure are often crucial for marginal cost estimation and counterfactual predictions. This paper introduces tests for price competition among multi-product rms. The tests are based on the firm's revealed preference (revealed pro t function). In contrast to other approaches based on estimated demand functions such as conduct parameter estimation, the proposed tests do not require any instrumental variables, even though the models can accommodate structural error terms. In this paper, I employ a demand structure introduced by Nocke and Schutz (2018), the discrete/continuous choice model, which nests the multinomial logit demand and CES demand functions. Any price and quantity data can be rationalized by price competition under a discrete/continuous choice model and increasing marginal costs. Adding more assumptions to the demand function, such as logit, CES, or the co-evolving and log-concave property produces some falsifiable restrictions.

Keywords: revealed preference; multi-product; conduct; discrete/continuous (search for similar items in EconPapers)
Pages: 35 pages
Date: 2021-10, Revised 2021-10
New Economics Papers: this item is included in nep-com, nep-dcm, nep-ind, nep-ore, nep-reg and nep-upt
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Published in SDE Series, October 2021, pages 1-35

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