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14 Eur. J.L. & Econ. 5 (2002)

handle is hein.journals/eurjlwec14 and id is 1 raw text is: European Journal of Law and Economics, 14: 5-13, 2002
@ 2002 Kluwer Academic Publishers. Manufactured in The Netherlands.
A Note on Optimal Law Enforcement
under Asymmetric Information
NUNO GAROUPA                                                           ngaroupa@fe.unl.pt
Faculdade de Economia, Universidade Nova de Lisboa, Campus de Campolide, 1099-032 Lisbon, Portugal;
CEPR, London
MOHAMED JELLAL
Toulouse Business School, 20 Boulevard Lasrosses BP 7010, 31068 Toulouse, France and GREI, Centre d'tudes
Strategiques, Universite Mohammed V, Rabat, Morocco
Abstract
We show that the probability of apprehension and punishment is usually reduced in a framework with asymmetric
information, leading to more offenses being committed. A positive correlation between crime and asymmetry
of information in the enforcement process is established. Some suggestions concerning the efficiency of private
versus public enforcement are drawn.
Keywords: fine, probability of detection, asymmetry of information
JEL Classification: K4
1. Introduction
Asymmetry of information between the government and a public enforcer as well as its
impact on the cost structure of enforcement has not been discussed in the literature. Most
models of law enforcement, since Becker (1968), assume symmetric information between
government and enforcers. That corresponds to an ideal public law enforcement context as
described by Landes and Posner (1975).
Realistically, public enforcement is not decided by a single actor, but by different agents, in
particular, public enforcers and a government. An enforcement agency is more likely to have
a comparative advantage in enforcement (detection and investigation) than the government.
Through its operating activities, the agency obtains private information; information that is
not available to the government (the principal). This information asymmetry poses a serious
problem of implementing an optimal enforcement policy (within the public enforcement
model).
The existence of asymmetry of information between enforcers and the government causes
the usual problem of regulating any bureaucracy: it could be that some resources are taken
out of enforcement activities to be spent in other activities that generate more utility to
enforcers (promoting their careers or selecting enforcement areas they want to target for
other reasons than social well-being); it could be that enforcers appropriate part of the
(public) enforcement budget for private reasons.1

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