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In this study we investigate how firm level environmental performance ( EP) affects firm level economic performance measured as profit efficiency ( PE) in a stochastic profit frontier setting. Analyzing firms in Swedish manufacturing 1990-2004, results show that EP induced by environmental policy is not a determinant of PE, while voluntary or market driven EP seem to have a significant and positive effect on firm PE in most sectors. The evidence generally supports the idea that good EP is also good for business, as long as EP is not brought on by policy measures, in this case a CO tax. Thus, the results provide no general support for the Porter hypothesis. [ABSTRACT FROM AUTHOR]

This study introduces an Environmental Performance Index (EPI) to assess the performance of firms that produce both good and bad outputs. In the one good output one bad output case, the EPI simplifies to the ratio of good–bad output for period t + 1 and period t. After deriving the index, data for U.S. coal-fired power plants from 1985 to 1998 are used to demonstrate insights that the EPI can provide. We find that power plants with units participating in Phase I of the Acid Rain Program experience a dramatic improvement in their EPI during 1994–1995. [ABSTRACT FROM AUTHOR]