Nirav Mehta

Department of Economics
University of Western Ontario
Social Science Centre 4063
London, ON N6A 5C2
Tel: 519-661-2111 Ext. 85284

E-Mail: EmailAddress: hidden: you can email any NBER-related person as first underscore last at nber dot org
Institutional Affiliation: University of Western Ontario

NBER Working Papers and Publications

May 2020Optimal Contracting with Altruistic Agents: A Structural Model of Medicare Payments for Dialysis Drugs
with Martin Gaynor, Seth Richards-Shubik: w27172
We study physician agency and optimal payment policy in the context of an expensive medication used in dialysis care. Using Medicare claims data we estimate a structural model of treatment decisions, in which physicians differ in their altruism and marginal costs, and this heterogeneity is unobservable to the government. In a novel application of nonlinear pricing methods, we theoretically characterize the optimal unrestricted contract in this screening environment with multidimensional heterogeneity. We combine these results with the estimated model to construct the optimal contract and simulate counterfactual outcomes. The optimal contract is a flexible fee-for-service contract, which pays for reported treatments but uses variable marginal payments instead of constant reimbursement r...
October 2018Time-Use and Academic Peer Effects in College
with Ralph Stinebrickner, Todd Stinebrickner: w25168
This paper examines academic peer effects in college. Unique new data from the Berea Panel Study allow us to focus on a mechanism wherein a student's peers affect her achievement by changing her study effort. Although the potential relevance of this mechanism has been recognized, data limitations have made it difficult to provide direct evidence about its importance. We find that a student's freshman grade point average is affected by the amount her peers studied in high school, suggesting the importance of this mechanism. Using time diary information, we confirm that college study time is actually being affected.

Published: Nirav Mehta & Ralph Stinebrickner & Todd Stinebrickner, 2019. "TIME-USE AND ACADEMIC PEER EFFECTS IN COLLEGE," Economic Inquiry, vol 57(1), pages 162-171. citation courtesy of

July 2015Social Interactions, Mechanisms, and Equilibrium: Evidence from a Model of Study Time and Academic Achievement
with Timothy Conley, Ralph Stinebrickner, Todd Stinebrickner: w21418
We develop and estimate a model of student study time on a social network. The model is designed to exploit unique data collected in the Berea Panel Study. Study time data allow us to quantify an intuitive mechanism for academic social interactions: own study time may depend on friend study time in a heterogeneous manner. Social network data allow us to embed study time and resulting academic achievement in an estimable equilibrium framework. We develop a specification test that exploits the equilibrium nature of social interactions and use it to show that novel study propensity measures mitigate econometric endogeneity concerns.
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