Prioritization in Private-Activity-Bond Volume Cap Allocation

This paper proposes and tests a structural model reflecting the process of authorizing private-activity municipal bond issuance. Private-activity municipal bonds offer tax-exempt financing for programs including industrial development, utilities, low-income housing, and student loans. The Federal tax code sets annual caps on the total tax-exempt issuance within each state, so authorization becomes a scarce resource distributed via a political process. Interviews with program administrators in several states suggested the authorization process involves prioritizing categories of use, authorizing bonds for high-priority uses first, and then authorizing bonds for lower-priority uses until the cap is exhausted. A model representing this process suggests variables to include in reduced-form estimations and an alternative interpretation of the coefficients. The fit of the model can be improved by adding measures of political influence and imposing a structure that reflects the political prioritization process. In general, industrial development and utilities appear to be the highest priority uses of private-activity municipal bonds. Mortgage revenue bonds are the residual category most frequently.