This paper describes a new, industry-adjusted index of state environmental compliance costs from 1977 to 1994. The index has two principal advantages: it controls for states' industrial compositions, and it can be calculated for 17 years, thus facilitating comparisons both among states and within states over time. Several notable facts emerge. First, differences in states' industrial compositions play a large role in determining their environmental compliance costs. Second, after controlling for industrial composition, the variance across states in compliance costs declined steadily between 1977 and 1994. Third, this cost index is negatively correlated with subjective indices of state environmental efforts compiled by various environmental organisations. In sum, the cost index described here provides some new data on historical trends in state regulatory differences, differs from the conventional wisdom regarding states' relative environmental efforts, and provides a useful tool for researchers exploring the effects of compliance costs on economic activity.
State environmental regulatory stringency compliance costs industrial compositions