NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Nonlinear Policy Rules and the Identification and Estimation of Causal Effects in a Generalized Regression Kink Design

David Card, David Lee, Zhuan Pei, Andrea Weber

NBER Working Paper No. 18564
Issued in November 2012

---- Acknowledgements -----

We thank Diane Alexander, Mingyu Chen, Martina Fink, Andrew Langan, Steve Mello, and Pauline Leung for excellent research assistance. We have benefited from the comments and suggestions of Andrew Chesher, Nathan Grawe, Bo Honoré, Guido Imbens, Pat Kline and seminar participants at Brookings, Cornell, Georgetown, IZA, LSE, NBER, Princeton, Rutgers, Upjohn, UC Berkeley, UCL, Uppsala, Wharton and Zürich. Andrea Weber gratefully acknowledges research funding from the Austrian Science Fund (NRN Labor Economics and the Welfare State). 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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