NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

A Note on Optimal Deterrence When Individuals Choose Among Harmful Acts

Steven Shavell

NBER Working Paper No. 3061*
Issued in August 1989
NBER Program(s):   LE

The theory of deterrence has been concerned primarily with situations

in which individuals consider whether to commit a single harmful act

(whether to discharge a pollutant into a lake, whether to steal a car)

rather than with situations in which individuals decide which of several

harmful acts to commit (whether to discharge one pollutant or another

pollutant into a lake, whether to engage in car theft or in burglary). In

the latter situations, the threat of sanctions plays a role in addition to

the usual one of deterring individuals from committing harmful acts: it

influences which harmful acts undeterred individuals choose to commit (it

accomplishes "marginal deterrence").

It is shown in the present note that sanctions may increase more with

harm when individuals choose among harmful acts than when individuals choose

onlv whether to commit single harmful acts. The reason is that a higher

gradation of sanctions encourages the undeterred to commit less harmful

acts. The assumption necessary for this conclusion is that probabilities of

apprehension for different acts are equal, being determined by a general

level of enforcement effort. If enforcement effort is specific to the act,

the conclusion does not hold; optimal sanctions for different acts are then

equal to each other.

*Published: "A Note on Marginal Deterrence When Individuals Choose Among Harmful Acts" International Review of Law & Economics, September, 1992, Vol. 12, 345-355.

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