NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Toward an understanding of the relative strengths of positive and negative reciprocity

Omar Al-Ubaydli, Uri Gneezy, Min Sok Lee, John A. List

NBER Working Paper No. 16547
Issued in November 2010

---- Acknowledgements -----

We wish to thank Ali Hortacsu and an anonymous referee for helpful comments, Jonathan Alevy for programming help and Nicholas Curott for excellent research assistance. 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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