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Pareto Improving Price Regulation When the Asset Market Is Incomplete

  • P. Jean-Jacques Herings

    (Dept. Econometrics & Center, Tilburg Univ.)

  • Heracles M. Polemarchakis

    (CORE, Universite Catholique de Louvain)

When the asset market is incomplete, competitive equilibria are constrained suboptimal, which provides a scope for pareto improving interventions. Price regulation can be such a pareto improving policy, even when the welfare effects of rationing are taken into account. An appealing aspect of price regulation is that it that it operates anonymously on market variables. Fix-price equilibria exist under weak assumptions. Such equilibria permit a competitive analysis of an economy with an incomplete asset market that is out of equilibrium. Arbitrage opportunities may arise: with three or more assets actively traded, an individual may hold an arbitrage portfolio at equilibrium. The local existence of fix-price equilibrium for prices that are almost competitive may fail for robust examples. Under necessary and sufficient conditions for the local existence of fix-price equilibria, Pareto improving price regulation is generically possible.

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Paper provided by Cowles Foundation for Research in Economics, Yale University in its series Cowles Foundation Discussion Papers with number 1210.

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Length: 42 pages
Date of creation: Feb 1999
Date of revision:
Publication status: Published in Economic Theory (2005), 25(1): 135-154
Handle: RePEc:cwl:cwldpp:1210
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