 Economic analysis of law easily accommodates sanction theories of duty. The analyst here simply reduces the sanction theory to self-interested preference maximization. This approach, as noted above, adheres to the assumption that agents are (narrowly) self-interested. It recognizes, however, that a legal rule may either provide the agent with relevant information (and hence change her beliefs) or place a price on certain actions. The price a legal rule places on conduct will depend on the legal form as the legal form determines the monitoring mechanism and the burdens of proof, both of which determine the probability that the legal sanction will be imposed. 