Enforcement by monitoring cannot be conditioned on the severity of an offense while enforcement by investigation can be. If some degrees of the offense are not adequately reported or if investigation is too costly, the regulator must monitor and treat offenses of different severity quite differently. Smaller offenses should not be investigated; they should be deterred by monitoring alone, coupled with graduated fines. To deter larger offenses, the regulator should vary the investigation rate while setting maximal fines.

We consider a principal-agent model to examine the effectiveness of responsibility centers, in particular cost or profit centers. We show that rather than contracting with each agent directly, the principal can create equally powerful incentives by setting up a responsibility center structure. The principal contracts with only the ‘manager’ of the center and delegates contracting with other agents and coordinating their activities. The principal then must monitor some measure of financial performance such as the center's cost of profit. We also find that responsibility centers dominate direct contracting with the agents when communication is limited.

Enforcement by monitoring cannot be conditioned on the severity of an offense while enforcement by investigation can be. If some degrees of the offenses are not adequately reported or if investigation is too costly, the regulator must monitor and treat offenses of different severity quite differently. Smaller offenses should not be investigated; they should be deterred by monitoring alone, coupled with graduated fines. To deter larger offenses, the regulator should vary the investigation rate while setting maximal fines.