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Strategic Consumption Complementarities: Can Price Flexibility Eliminate Inefficiencies and Instability?

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  • EMANUELA RANDON
  • PETER SIMMONS

Abstract

Generally, two facts occur with strategic complementarities and fixed prices: (i) the equilibria are multiple and (ii) if the complementarities are strong, the law of demand is violated and the equilibrium is unstable. In this paper, we analyse the effect of price flexibility on these features as well as on market welfare properties. Assuming an exchange economy with H agents consuming two goods with one strategic complement, we show that flexibility of prices may remove both the multiplicity of the equilibria and the instability of behavior when the externalities are strong. Moreover, we find conditions to correct instability when it is caused by perverse wealth effects. When preferences are quasilinear and identical, if the externality is beneficial, any equilibrium is Pareto optimal despite the externality. But if the externality is detrimental, corrections are required.

Suggested Citation

  • Emanuela Randon & Peter Simmons, 2010. "Strategic Consumption Complementarities: Can Price Flexibility Eliminate Inefficiencies and Instability?," Journal of Public Economic Theory, Association for Public Economic Theory, vol. 12(2), pages 249-279, April.
    • Handle: RePEc:bla:jpbect:v:12:y:2010:i:2:p:249-279
    DOI: 10.1111/j.1467-9779.2009.01436.x
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    More about this item

    JEL classification:

    • D62 - Microeconomics - - Welfare Economics - - - Externalities
    • C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games
    • D50 - Microeconomics - - General Equilibrium and Disequilibrium - - - General

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