Publications

Winter 2022
Article

Determinants of Small Business Reopening Decisions After COVID Restrictions Were Lifted

By: Dylan Balla-Elliott, Zoë B. Cullen, Edward L. Glaeser, Michael Luca and Christopher Stanton

The COVID-19 pandemic led to dramatic economic disruptions, including government-imposed restrictions that temporarily shuttered millions of American businesses. We use a nation-wide survey of thousands of small business owners to establish three main facts about... View Details

Keywords: COVID-19; Demand Forecasting; Reopening; Health Pandemics; Government Administration; Small Business

2022
Working Paper

Social Protection and Social Distancing During the Pandemic: Mobile Money Transfers in Ghana

By: Dean Karlan, Matt Lowe, Robert Osei, Isaac Osei-Akoto, Benjamin N. Roth and Christopher Udry

We study the impact of mobile money transfers to a representative sample of low-income Ghanaians during the COVID-19 pandemic. The announcement of the upcoming transfers affects neither consumption, well-being, nor social distancing. Once disbursed,... View Details

Keywords: Social Distancing; Social Welfare; Economic Relief; Health Pandemics; Poverty

March 2022
Teaching Note

Inclusive Innovation at Mass General Brigham

By: Katherine Coffman and Olivia Hull

Teaching Note for HBS Case No. 921-006, “Inclusive Innovation at Mass General Brigham." This case invites students to explore the individual and structural factors that lead to an under-representation of women in male-dominated domains, and to think critically about... View Details

Keywords: Inclusion; Gender Gap; Gender Inclusivity; Gender; Equality and Inequality; Management Analysis, Tools, and Techniques

March 2022
Article

Assessing the Impact of the COVID-19 Pandemic on Clinician Ambulatory Electronic Health Record Use

By: A Jay Holmgren, Lance Downing, Mitchell Tang, Christopher Sharp, Christopher Longhurst and Robert S. Huckman

Objective: The COVID-19 pandemic changed clinician electronic health record (EHR) work in a multitude of ways. To evaluate how, we measure ambulatory clinician EHR use in the United States throughout the COVID-19 pandemic.

Materials and Methods: We use EHR... View Details

Keywords: Health Care; Electronic Health Records; Productivity; COVID-19 Pandemic; Health Care and Treatment; Health Pandemics; Information Technology; Performance Productivity; United States

Article

A 680,000-Person Megastudy of Nudges to Encourage Vaccination in Pharmacies

By: Katherine L. Milkman, Linnea Gandhi, Mitesh S. Patel, Heather N. Graci, Dena M. Gromet, Hung Ho, Joseph S. Kay, Timothy W. Lee, Jake Rothschild, Jonathan E. Bogard, Ilana Brody, Christopher F. Chabris, Edward Chang, Gretchen B. Chapman, Jennifer E. Dannals, Noah J. Goldstein, Amir Goren, Hal Hershfield, Alex Hirsch, Jillian Hmurovic, Samantha Horn, Dean Karlan, Ariella S. Kristal, Cait Lamberton, Michael N. Meyer, Allison H. Oakes, Maurice E. Schweitzer, Maheen Shermohammed, Jaochim H. Talloen, Caleb Warren, Ashley V. Whillans, Kuldeep N. Yadav, Julian J. Zlatev, Ron Berman, Chalanda N. Evans, Rahul Ladhania, Jens Ludwig, Nina Mazar, Sendhil Mullainathan, Christopher K. Snider, Jann Spiess, Eli Tsukayama, Lyle Ungar, Christophe Van den Bulte, Kevin G. Volpp and Angela L. Duckworth

Encouraging vaccination is a pressing policy problem. To assess whether text-based reminders can encourage pharmacy vaccination and what kinds of messages work best, we conducted a megastudy. We randomly assigned 689,693 Walmart pharmacy patients to receive one of 22... View Details

Keywords: Vaccination; Vaccines; Nudges; Communication Strategy; Communication Technology; Consumer Behavior; Health Care and Treatment

December 2021
Article

Employee Responses to Compensation Changes: Evidence from a Sales Firm

By: Jason Sandvik, Richard Saouma, Nathan Seegert and Christopher Stanton

What are the long-term consequences of compensation changes? Using data from an inbound sales call center, we study employee responses to a compensation change that ultimately reduced take-home pay by 7% for the average affected worker. The change caused a significant... View Details

Keywords: Employees; Wages; Compensation and Benefits; Change; Performance; Resignation and Termination; Retention; Analysis

May 2021
Case

Inclusive Innovation at Mass General Brigham

By: Katherine Baldiga Coffman and Olivia Hull

Massachusetts General Brigham (MGB) Chief Innovation Officer Christopher Coburn had overseen a period of exciting transformation and growth in healthcare innovation at MGB. In November 2019, the health system was the largest recipient of National Institutes of Health... View Details

Article

A Megastudy of Text-Based Nudges Encouraging Patients to Get Vaccinated at an Upcoming Doctor's Appointment

By: Katherine L. Milkman, Mitesh S. Patel, Linnea Gandhi, Heather N. Graci, Dena M. Gromet, Hung Ho, Joseph S. Kay, Timothy W. Lee, Modupe Akinola, John Beshears, Jonathan E. Bogard, Alison Buttenheim, Christopher F. Chabris, Gretchen B. Chapman, James J. Choi, Hengchen Dai, Craig R. Fox, Amir Goren, Matthew D. Hilchey, Jillian Hmurovic, Leslie K. John, Dean Karlan, Melanie Kim, David Laibson, Cait Lamberton, Brigitte C. Madrian, Michelle N. Meyer, Maria Modanu, Jimin Nam, Todd Rogers, Renante Rondina, Silvia Saccardo, Maheen Shermohammed, Dilip Soman, Jehan Sparks, Caleb Warren, Megan Weber, Ron Berman, Chalanda N. Evans, Christopher K. Snider, Eli Tsukayama, Christophe Van den Bulte, Kevin G. Volpp and Angela L. Duckworth

Many Americans fail to get life-saving vaccines each year, and the availability of a vaccine for COVID-19 makes the challenge of encouraging vaccination more urgent than ever. We present a large field experiment (N = 47,306) testing 19 nudges delivered to patients via... View Details

Keywords: Vaccination; COVID-19; Nudge; Influenza; Field Experiment; Health; Communication Strategy; Behavior

May 2021
Supplement

Hello Alfred: Come Home Happy — Operating the Business Model Exercise, Instructor Version

By: Joseph B. Fuller and Christopher Payton

On a mission to "automate the on-demand economy," Harvard Business School classmates Marcela Sapone and Jessica Beck launched Hello Alfred in 2013 to provide subscribers with an "Alfred" to complete various chores for a monthly fee. In early 2016, the company has built... View Details

Keywords: Growth and Development Strategy; Internet and the Web; Business Startups; Service Operations; Mobile and Wireless Technology; Service Industry; New York (city, NY); Boston

May 2021
Article

Preparing for a Pandemic: Accelerating Vaccine Availability

By: Amrita Ahuja, Susan Athey, Arthur Baker, Eric Budish, Juan Camilo Castillo, Rachel Glennerster, Scott Duke Kominers, Michael Kremer, Jean Lee, Canice Prendergast, Christopher M. Snyder, Alex Tabarrok, Brandon Joel Tan and Witold Wiecek

Vaccinating the world’s population quickly in a pandemic has enormous health and economic benefits. We analyze the problem faced by governments in determining the scale and structure of procurement for vaccines. We analyze alternative approaches to procurement, arguing... View Details

Keywords: Vaccines; Procurement; Health Pandemics; Health Care and Treatment; Acquisition; Cooperation

April 2021 (Revised January 2022)
Case

SA Taxi: A Vehicle for Empowerment? (A)

By: Nien-he Hsieh, Dilyana Karadzhova Botha and F. Christopher Eaglin

SA Taxi was a vertically integrated business that operated in South Africa’s distinctive taxi industry. Despite being plagued by violence, informal structures, unsafe road practices and lack of government support, the taxi industry had grown to become South Africa’s... View Details

Keywords: Corporate Accountability; Ownership; Ownership Stake; Business and Stakeholder Relations; Equality and Inequality; Race; Situation or Environment; Transportation Industry; South Africa; Africa

April 2021 (Revised January 2022)
Supplement

SA Taxi: A Vehicle for Empowerment? (B)

By: Nien-he Hsieh, Dilyana Karadzhova Botha and F. Christopher Eaglin

SA Taxi was a vertically integrated business that operated in South Africa’s distinctive taxi industry. Despite being plagued by violence, informal structures, unsafe road practices and lack of government support, the taxi industry had grown to become South Africa’s... View Details

Keywords: Corporate Accountability; Ownership; Ownership Stake; Business and Stakeholder Relations; Equality and Inequality; Race; Situation or Environment; Transportation Industry; South Africa; Africa

Article

Dynamic Silos: Modularity in Intra-organizational Communication Networks during the Covid-19 Pandemic

By: Jonathan Larson, Tiona Zuzul, Emily Cox Pahnke, Neha Parikh Shah, Patrick Bourke, Nicholas Caurvina, Fereshteh Amini, Youngser Park, Joshua Vogelstein, Jeffrey Weston, Christopher White and Carey E. Priebe

Workplace communications around the world were drastically altered by Covid-19, work-from-home orders, and the rise of remote work. We analyze aggregated, anonymized metadata from over 360 billion emails within over 4000 organizations worldwide to examine changes in... View Details

Keywords: COVID-19; Remote Work; Organizational Silos; Health Pandemics; Organizations; Communication; Networks

Article

CDS Trading and Nonrelationship Lending Dynamics

By: Jung Koo Kang, Christopher Williams and Regina Wittenberg-Moerman

We investigate how credit default swaps (CDSs) affect lenders’ incentives to initiate new lending relationships. We predict that CDSs reduce adverse selection that nonrelationship lead arrangers face when competing for loans. Consistently, we find that a loan is... View Details

Keywords: Credit Default Swaps; CDS Market; Non-relationship Lending; Debt Contracts; Adverse Selection; Lending Monitoring; Cross-selling

February 2021
Article

Assessment of Electronic Health Record Use Between U.S. and Non-U.S. Health Systems

By: A Jay Holmgren, Lance Downing, David W. Bates, Tait D. Shanafelt, Arnold Milstein, Christopher Sharp, David Cutler, Robert S. Huckman and Kevin A. Schulman

Importance: Understanding how the electronic health record (EHR) system changes clinician work, productivity, and well-being is critical. Little is known regarding global variation in patterns of use.
Objective: To provide insights into which EHR... View Details

Keywords: Electronic Health Records; Health Care and Treatment; Online Technology; Health Industry; Information Technology Industry

2020
Working Paper

Vertical Integration of Healthcare Providers Increases Self-Referrals and Can Reduce Downstream Competition: The Case of Hospital-Owned Skilled Nursing Facilities

By: David Cutler, Leemore S. Dafny, David Grabowski, Steven S. Lee and Christopher Ody

The landscape of the U.S. healthcare industry is changing dramatically as healthcare providers expand both within and across markets. While federal antitrust agencies have mounted several challenges to same-market combinations, they have not challenged any... View Details

Keywords: Antitrust; Health Care and Treatment; Vertical Integration; Organizational Structure; Competition; Health Industry; United States

November 2020
Article

Casting Conference Calls

By: Lauren Cohen, Dong Lou and Christopher J. Malloy

We explore a subtle but important mechanism through which firms can control information flow to the markets. We find that firms that “cast” their conference calls by disproportionately calling on bullish analysts tend to underperform in the future. Firms that call on... View Details

Keywords: Strategic Release; Firms; Conference Calls; Information; Strategy; Asset Pricing

SSRN

October 2020 (Revised August 2022)
Case

Epic Games: Nineteen Eighty-Fortnite

By: Andy Wu, Miaomiao Zhang and Christopher Zhang

In the midst of intensifying public and political attention towards the market power of big technology, Epic Games in 2020 challenged the status quo that has existed for years in the Apple iOS and Google Android mobile application marketplaces and payment systems.... View Details

Keywords: Mobile Platforms; Mobile App Industry; Mobile Payment Systems; Antitrust; Games, Gaming, and Gambling; Mobile and Wireless Technology; Lawsuits and Litigation; Entrepreneurship; Competitive Strategy; Digital Platforms; United States

October 2020
Article

IQ from IP: Simplifying Search in Portfolio Choice

By: Huaizhi Chen, Lauren Cohen, Umit Gurun, Dong Lou and Christopher J. Malloy

Using a novel database that tracks web traffic on the SEC’s EDGAR servers between 2004 and 2015, we show that mutual fund managers gather information on a very particular subset of firms and insiders, and their surveillance is very persistent over time. This tracking... View Details

Keywords: Tracked Trades; Return Predictability; Institutional Trading; Insider Trading; Institutional Investing; Information; Investment Portfolio; Decisions; Management

SSRN