NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Crowding In with Impure Altruism: Theory and Evidence from Volunteerism in National Parks

Matthew Kotchen, Katherine R.H. Wagner

NBER Working Paper No. 26445
Issued in November 2019

---- Acknowledgments ----

We are grateful to Ted Bergstrom, Nathan Chan, Joshua Gottlieb, Catie Hausman, Grant Jacobsen, Erin Mansur, Todd Sandler, Joe Shapiro, Lise Vesterlund, and Casey Wichman for helpful comments and discussions, along with seminar participants who commented on earlier versions of this research at Carnegie Mellon University, Columbia University, McGill University, London School of Economics, UC Berkeley, UC Santa Barbara, University of Connecticut, University of Pittsburgh, Yale University, and the 2019 NBER Summer Institute. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.

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