NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

The SO2 Allowance Trading System and the Clean Air Act Amendments of 1990: Reflections on Twenty Years of Policy Innovation

Gabriel Chan, Robert Stavins, Robert Stowe, Richard Sweeney

NBER Working Paper No. 17845
Issued in February 2012

---- Acknowledgements -----

We gratefully acknowledge the contributions of participants in a research workshop and policy roundtable in May 2011, as well as the comments and edits some provided on an earlier draft of this paper (described as a "policy brief" within). Their expertise and experience made the project possible. (Comments made by participants in the workshop were not intended for attribution, and specific insights are not referenced in the paper. For a list of participants, see inside the back cover.) We also thank Marika Tatsutani, who edited the paper and provided valuable substantive insights, and Bryan Galcik, who designed and produced the document. Finally, we are grateful to the Alfred P. Sloan Foundation, which provided generous support for the workshop and for the preparation of this study. The views expressed herein are those of the authors and do not necessarily reflect the views of the Harvard Kennedy School, Harvard University, or the National Bureau of Economic Research.

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