A model where a portion of the population participates in illegal activitie
s is developed. The propensity to participate in crimes depends on the prob
ability and the opportunity cost of being arrested. The government can infl
uence these variables by law enforcement expenditures and by social transfe
rs. We analyze the cost minimizing policy mix and the incentive of wealthy
agents to finance redistribution. We compare this approach with standard mo
delling where redistribution follows from altruistic preferences. (C) 2000
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