Working Papers

These papers are working drafts of research which often appear in final form in academic journals. The published versions may differ from the working versions provided here.

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Kostas Bimpikis, Ozan Candogan, Daniela Saban
January 11, 2018

We explore spatial price discrimination in the context of a ride-sharing platform that serves a network of locations. Riders are heterogeneous in terms of their destination preferences and their willingness to pay for receiving service....

Georg Schorpp, Feryao Erhun, Hau L. Lee
January 2018

We study contracting for a three-tier supply chain consisting of a buyer, a supplier, and a sub-supplier where disruptions of random length occur at the sub-supplier. As is common in supply chains, the buyer has...

Kostas Bimpikis, Wedad J. Elmaghraby, Ken Moon, Wenchang Zhang
2018

Platforms can obtain sizable returns by operationally managing their market thickness, i.e., the availability of supply-side inventory. Using data from a natural experiment on a major B2B auction platform specializing in the $424 billion secondary...

Omar Besbes, Yonatan Gur, Assaf Zeevi
2018

In a multi-armed bandit (MAB) problem a gambler needs to choose at each round of play one of K arms, each characterized by an unknown reward distribution. Reward realizations are only observed when an arm...

Kostas Bimpikis, Ozan Candogan, Shayan Ehsani
2018

This paper studies multi-tier supply chain networks in the presence of disruption risk. Firms decide how to source their inputs from upstream suppliers so as to maximize their expected profits, and prices of intermediate goods...

Benjamin Hébert
December 29, 2017

Regulations on financial intermediaries can create apparent arbitrage opportunities. Intermediaries are unable to fully exploit these opportunities due to regulation, and other agents are unable to exploit them at all due to limited participation. Does...

Basak Kalkanci, Erica Plambeck
October 31, 2017

This paper contributes to a recent thrust in the OM literature on how various sorts of transparency influence social and environmental responsibility in a supply chain. In practice, companies are under pressure to publish their...

Li Chen, Yao Cui, Hau L. Lee
September 8, 2017

Given the promise of 3D printing, also known as additive manufacturing, some innovative consumer goods companies have started to experiment with such a technology for on-demand production. However, the potential impact of 3D printing on...

David J. Lowsky, Donald K.K. Lee, Stefanos Zenios
July 16, 2017

A Health Savings Account (HSA) is a tax-advantaged savings account available only to households with high-deductible health insurance. This paper provides initial answers to two questions related to HSAs: 1) How should a household determine...

Susan Athey, Stefan Wager
July 10, 2017

Many scientific and engineering challenges – ranging from personalized medicine to customized marketing recommendations – require an understanding of treatment effect heterogeneity. In this paper, we develop a non-parametric causal forest for estimating heterogeneous treatment...

Susan Athey, Stefan Wager, Julie Tibshirani
July 6, 2017

We propose generalized random forests, a method for non-parametric statistical estimation based on random forests (Breiman, 2001) that can be used to fit any quantity of interest identified as the solution to a set of...

Yash Kanoria, Daniela Saban
July 5, 2017

Two-sided matching platforms, such as those for labor, accommodation, dating, and taxi hailing, can control and optimize over many aspects of the search for partners. To understand how the search for partners should be designed,...

Baris Ata, Yinchuan Ding, Stefanos Zenios
June 7, 2017

The deceased-donor kidney transplant candidates in the US are ranked according to characteristics of both the donor and the recipient. We seek the ranking policy that achieves the best efficiency-equity tradeoff, taking into account patients’...

Santiago Balseiro, Yonatan Gur
2017

In online advertising markets, advertisers often purchase ad placements through bidding in repeated auctions based on realized viewer information. We study how budget-constrained advertisers may compete in such sequential auctions in the presence of uncertainty...

Mohsen Bayati, Sara Kwasnick, Danqi Luo, Erica Plambeck
2017

This paper provides empirical evidence that in an ED, arrival of an additional low-acuity patient significantly increases high-acuity patients’ wait times. To estimate that effect, we propose a method motivated by queueing theory and involving...

Susan Athey, Mohsen Bayati, Nick Doudchenko, Guido W. Imbens, Khashayar Khosravi
2017

In this paper we develop new methods for estimating causal effects in settings with panel data, where a subset of units are exposed to a treatment during a subset of periods, and the goal is...

Hamsa Bastani, Mohsen Bayati, Khashayar Khosravi
2017

The contextual bandit literature has traditionally focused on algorithms that address the exploration-exploitation tradeoff. In particular, greedy algorithms that exploit current estimates without any exploration may be sub-optimal in general. However, exploration-free greedy algorithms...

Hamsa Bastani, Mohsen Bayati
2017

Big data has enabled decision-makers to tailor decisions at the individual-level in a variety of domains such as personalized medicine and online advertising. This involves learning a model of decision rewards conditional on individual-specific covariates....

Yonatan Gur, Lijian Lu, Gabriel Weintraub
August 11, 2016

Framework agreements (FAs) are procurement mechanisms commonly used by buying agencies around the world to satisfy demand that arises over a certain time horizon. This paper is one of the first in the literature that...