Dynamic Processes of Social and Economic Interactions: On the Persistence of Inefficiencies

54 Pages Posted: 6 Nov 2001

See all articles by Armando R. Gomes

Armando R. Gomes

Washington University in St. Louis - John M. Olin Business School; Washington University in Saint Louis - John M. Olin Business School

Philippe Jehiel

University College London - Department of Economics; Ecole Nationale des Ponts et Chaussées (ENPC) - Centre d'Enseignement et de Recherche en Analyse Socio-Economique (CERAS); Centre for Economic Policy Research (CEPR)

Multiple version iconThere are 2 versions of this paper

Date Written: October 2001

Abstract

This Paper considers the efficiency and convergence properties of dynamic processes of social and economic interactions, such as exchange economies, multilateral negotiations, merger and divestiture transactions, or legislative bargaining. The key general feature of the economy is that agents can implement any move from one state to another as long as a pre-specified subset of agents approve. By means of examples, we show that inefficiencies may occur even in the long run. Persistent inefficiencies take the form of cycles between states or of convergence to an inefficient state. When agents are sufficiently patient, we show very generally that the initial state from which the process starts plays no role in the long-run properties of equilibria. Also, when there exists an efficient state that is externality free (in the sense that a move away from that state does not hurt the agents whose consent is not required for the move), then the system must converge to this efficient state in the long-run. Conversely, long-run efficiency can only be attained in a robust way if there exists an efficient externality-free state. It is thus more important to design transitions guaranteeing the existence of an efficient externality-free state rather than to implement a fine initialization of the process.

Keywords: Dynamic games, multilateral interactions, externalities, efficiency

JEL Classification: C70, D50, D70

Suggested Citation

Gomes, Armando R. and Gomes, Armando R. and Jehiel, Philippe, Dynamic Processes of Social and Economic Interactions: On the Persistence of Inefficiencies (October 2001). Available at SSRN: https://ssrn.com/abstract=289564

Armando R. Gomes (Contact Author)

Washington University in St. Louis - John M. Olin Business School ( email )

One Brookings Drive
Campus Box 1133
St. Louis, MO 63130-4899
United States
314-935-4569 (Phone)

Washington University in Saint Louis - John M. Olin Business School ( email )

One Brookings Drive
Campus Box 1133
St. Louis, MO 63130-4899
United States
314-935-4569 (Phone)

Philippe Jehiel

University College London - Department of Economics ( email )

Gower Street
London WC1E 6BT, WC1E 6BT
United Kingdom

Ecole Nationale des Ponts et Chaussées (ENPC) - Centre d'Enseignement et de Recherche en Analyse Socio-Economique (CERAS) ( email )

28, rue des Saints-Peres
75007 Paris
France
+33 1 4458 2873 (Phone)
+33 1 4458 2880 (Fax)

Centre for Economic Policy Research (CEPR)

London
United Kingdom

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