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Operations & Supply Chain Management

See the latest research, articles and faculty on the Operations & Supply Chain Management Area of Expertise at Columbia Business School.

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Latest on Operations & Supply Chain Management

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Operations & Supply Chain Management Faculty

CBS Faculty Research on Operations & Supply Chain Management

Dynamic Pricing under Debt: Spiraling Distortions and Efficiency Losses

Authors
Omar Besbes, Dan Iancu, and Nikos Trichakis
Date
October 1, 2018
Format
Journal Article
Journal
Management Science

Firms often finance their inventory through debt and subsequently sell it to generate profits and service the debt. Pricing of products is consequently driven by both inventory and debt servicing considerations. In the present paper, we analyze how debt distorts dynamic pricing decisions and reduces generated sales revenues. We show that debt induces sellers to always price higher than the revenue-maximizing price.

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Assessing the Impact of Service Level when Customer Needs are Uncertain: An Empirical Investigation of Hospital Step-Down Units

Authors
Carri Chan, Linda Green, Suparerk Lekwijit, Lijian Lu, and Gabriel J. Escobar
Date
June 1, 2018
Format
Journal Article
Journal
Management Science

Many service systems have servers with different capabilities and customers with varying needs. One common way this occurs is when servers are hierarchical in their skills or in the level of service they can provide. Much of the literature studying such systems relies on an understanding of the relative costs and benefits associated with serving different customer types by the different levels of service. In this work, we focus on estimating these costs and benefits in a complex healthcare setting where the major differentiation among server types is the intensity of service provided.

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Incorporating Longitudinal Comorbidity and Acute Physiology Data in Template Matching for Assessing Hospital Quality: an Exploratory Study in an Integrated Health Care Delivery System

Authors
Wenqi Hu, Carri Chan, Jose R. Zubizarreta, and Gabriel J. Escobar
Date
May 1, 2018
Format
Journal Article
Journal
Medical Care

Objective:

We sought to build on the template-matching methodology by incorporating longitudinal comorbidities and acute physiology to audit hospital quality.

Study Setting:

Patients admitted for sepsis and pneumonia, congestive heart failure, hip fracture, and cancer between January 2010 and November 2011 at 18 Kaiser Permanente Northern California hospitals.

Study Design:

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An Examination of Early Transfers to the ICU Based on a Physiologic Risk Score

Authors
Wenqi Hu, Carri Chan, and Gabriel Escobar
Date
April 25, 2018
Format
Journal Article
Journal
Manufacturing & Service Operations Management

Unplanned transfers of patients from general medical-surgical wards to the Intensive Care Unit (ICU) may occur due to unexpected patient deterioration. Such patients tend to have higher mortality rates and longer lengths of stay than direct admits to the ICU. A new predictive model, the EDIP2, was developed with the intent to identify patients at risk for deterioration, which in some cases could trigger a proactive transfer to the ICU. While it is conceivable that proactive transfers could improve individual patient outcomes, they could also lead to ICU congestion.

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The Impact of Opening a Medical Step-Down Unit on Medically Critically Ill Patient Outcomes and Throughput: A Difference-in-Differences Analysis

Authors
Hayley B. Gershengorn, Carri Chan, Yunchao Xu, Hanxi Sun, Ronni Levy, Mor Armony, and Michelle N. Gong
Date
March 18, 2018
Format
Journal Article
Journal
Journal of Intensive Care Medicine

Objective:

To understand the impact of adding a medical step-down unit (SDU) on patient outcomes and throughput in a medical intensive care unit (ICU).

Design:

Retrospective cohort study.

Setting:

Two academic tertiary care hospitals within the same health-care system.

Patients:

Adults admitted to the medical ICU at either the control or intervention hospital from October 2013 to March 2014 (preintervention) and October 2014 to March 2015 (postintervention).

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Payment Systems and the Distributed Ledger Technology

Authors
Laurie Simon Hodrick
Date
January 1, 2018
Format
Chapter
Book
The Structural Foundations of Monetary Policy

An essential function of the Federal Reserve is to manage the central payment system. The distributed ledger technology is a digital innovation with the potential to transform payments, clearing, and settlement processes. In my brief remarks, I will introduce the Federal Reserve's management of payment systems, emphasize how the distributed ledger technology could reduce operational and financial inefficiencies for payment systems, and highlight some potential challenges to the distributed ledger technology's broad implementation.

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Spatial Capacity Planning

Authors
Omar Besbes, Francisco Castro, and Ilan Lobel
Date
Forthcoming
Format
Newspaper/Magazine Article
Publication
Operations Research

We study the relationship between capacity and performance for a service firm with spatial operations, in the sense that requests arrive with origin-destination pairs. An example of such a system is a ride-hailing platform in which each customer arrives in the system with the need to travel from an origin to a destination. We propose a state-dependent queueing model that captures spatial frictions as well as spatial economies of scale through the service rate.

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Critical Care Capacity Management: Understanding the role of a Step Down Unit

Authors
Mor Armony, Carri Chan, and Bo Zhu
Date
November 29, 2017
Format
Journal Article
Journal
Production and Operations Management

In hospitals, Step Down Units (SDUs) provide an intermediate level of care between the Intensive Care Units (ICUs) and the general medical-surgical wards. Because SDUs are less richly staffed than ICUs, they are less costly to operate; however, they also are unable to provide the level of care required by the sickest patients. There is an ongoing debate in the medical community as to whether and how SDUs should be used. On one hand, an SDU alleviates ICU congestion by providing a safe environment for post-ICU patients before they are stable enough to be transferred to the general wards.

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Auctions in the Online Display Advertising Chain: A Case for Independent Campaign Management

Authors
Amine Allouah and Omar Besbes
Date
June 5, 2017
Format
Working Paper

In many auctions, buyers are represented by an intermediary that manages their bidding process, along with that of other buyers. Notably, this is prevalent in the real-time online display advertising market, in which advertisers bid for impressions through intermediaries called demand side platforms (DSPs). In turn, intermediaries, when bidding on behalf of their customers, strategize to maximize some internal objective and may only submit a single bid to limit competition on a given item.

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