skip to content

Faculty of Economics

Journal Cover

Lee, J. and Sabourian, H.

Complexity and repeated implementation

Journal of Economic Theory

Vol. 158(A) pp. 259-292 (2015)

Abstract: This paper examines the problem of repeatedly implementing an efficient social choice function when the agents' preferences evolve randomly. We show that the freedom to set different mechanisms at different histories can give the planner an additional leverage to deter undesirable behavior even if the mechanisms are restricted to be simple and finite. Specifically, we construct a history-dependent sequence of simple mechanisms such that, with minor qualifications, every pure subgame perfect equilibrium delivers the correct social choice at every history, while every mixed equilibrium is strictly Pareto-dominated. More importantly, when faced with agents with a preference for less complex strategies at the margin, the (efficient) social choice function can be repeatedly implemented in subgame perfect equilibrium in pure or mixed strategies. Our results demonstrate a positive role for complexity considerations in mechanism design.

Keywords: Complexity, Repeated implementation, Efficiency, Finite mechanisms, Mixed Strategies, Subgame perfect equilibrium

JEL Codes: A13, C72, C73, D02, D70

Author links: Hamid Sabourian  

Publisher's Link:

Papers and Publications

Recent Publications

Porzio, T., Rossi, F. and Santangelo, G. The Human Side of Structural Transformation American Economic Review [2022]

Merrick Li, Z. and Linton, O. A ReMeDI for Microstructure Noise Econometrica [2022]

Gallo, E. and Yan, C. Efficiency and Equilibrium in Network Games: An Experiment Review of Economics and Statistics, accepted [2022]

Carneiro, P., Liu, K. and Salvanes, K. G. The Supply of Skill and Endogenous Technical Change: Evidence from a College Expansion Reform Journal of the European Economic Association, accepted [2022]