Walter is a Senior Lecturer in Economics at Birkbeck, University of London, and received his PhD from the University of California at Berkeley. His research examines intrinsic market uncertainty, arising from stochastic demand as a consequence of incomplete information about consumers' valuations or preferences. His research is concerned with the empirical analysis of vertical contracting in intermediate goods markets.
Education
PhD Economics, University of California, Berkeley, 2000
MSc Economics , University of California, Berkeley, 1996
Diplom Volkswirtschaftslehre, Universität Bonn, 1994
We investigate the consequences of discreteness in the assignment variable in regression-discontinuity designs for cases where the outcome variable is itself discrete.
There exists a useful framework for jointly implementing Durbin-Wu-Hausman exogeneity and Sargan-Hansen overidenti cation tests, as a single arti cial regression. This note sets out the framework for linear models and discusses its extension to non-linear models. It also provides an empirical example and some Monte Carlo results.
This paper studies regulatory policy interventions aimed at protecting vulnerable consumers who are disengaged and thus exposed to exploitation. We model heterogeneous consumer switching costs alongside asymmetric market shares.
This paper considers the micro-econometric analysis of patients' hospital choice for elective medical procedures when their choice set is pre-selected by a general practitioner (GP).
