by Jonathan Pellegrin - Publications - Faculty & Research - Harvard Business School

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August 2025
Article

Revenue Collapses and the Consumption of Small Business Owners in the COVID-19 Pandemic

By: Olivia S. Kim, Jonathan A. Parker and Antoinette Schoar

Using financial account data linking small businesses to their owner households, we examine how business owners’ consumption responded to changes in business revenues during the COVID-19 crisis. In the first two months following the National Emergency, business... View Details

Keywords: Revenue; Small Business; Health Pandemics; Spending; Consumer Behavior

May 2025
Teaching Note

Bridj and the Business of Urban Mobility (B): A New Model in Kansas City

By: Rosabeth Moss Kanter and Jonathan Cohen

This Teaching Note helps instructors teach students the HBS Case, Bridj and the Business of Urban Mobility (B): A New Model in Kansas City. In late 2016, Bridj was expanding its digital platform to help address urban mobility problems faced by cities across the country... View Details

Keywords: App Development; Innovation; Stakeholder Engagement; Collaboration; Ride-sharing; Entrenchment; Digital; Transportation; Urban Development; Disruption; Business Startups; Digital Platforms; Growth and Development Strategy; Business and Stakeholder Relations; Partners and Partnerships; Expansion

2025
Working Paper

Management and Firm Dynamism

By: Nicholas Bloom, Jonathan S. Hartley, Raffaella Sadun, Rachel Schuh and John Van Reenen

We show better-managed firms are more dynamic in plant acquisitions, disposals, openings and closings in U.S. Census and international data. Better-managed firms also birth better-managed plants, and improve the performance of the plants they acquire. To explain these... View Details

Keywords: Management Practices; Productivity; Management Practices and Processes; Mergers and Acquisitions; Competition; Business or Company Management; Performance Productivity

April 2025
Article

Dynamic Silos: Increased Modularity and Decreased Stability in Intra-organizational Communication Networks During the COVID-19 Pandemic

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

Workplace communications around the world were drastically altered by COVID-19, related work-from-home orders, and the rise of remote work. To understand these shifts, we analyzed aggregated, anonymized metadata from over 360 billion emails within 4,361 organizations... View Details

Keywords: Remote Work; COVID-19; Communication Technology; Organizational Change and Adaptation

February 2023
Case

Germany, Europe, and Green Industrial Revolution

By: Gunnar Trumbull and Jonathan Schlefer

In 2023, Germany was racing to master yet another industrial revolution: this time in green technology. Could it transform its manufacturing and industry in time to sustain internationally competitiveness, especially with the United States and China; reach carbon... View Details

Keywords: Economy; Economic Growth; Success; Leadership; Problems and Challenges; Germany

2023
Article

A Randomized Trial of Behavioral Nudges Delivered through Text Messages to Increase Influenza Vaccination among Patients with an Upcoming Primary Care Visit

By: Mitesh S. Patel, Katherine L. Milkman, Linnea Gandhi, Heather N. Graci, Dena Gromet, Hung Ho, Joseph S. Kay, Timothy W. Lee, Jake Rothschild, Modupe Akinola, John Beshears, Jonathan E. Bogard, Alison Buttenheim, Christopher Chabris, Gretchen B. Chapman, James J. Choi, Hengchen Dai, Craig R. Fox, Amir Goren, Matthew D. Hilchey, Jillian Hmurovic, Leslie 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, Seung Hyeong Lee, Christopher K. Snider, Eli Tsukayama, Christophe Van den Bulte, Kevin G. Volpp and Angela L. Duckworth

Purpose: To evaluate if nudges delivered by text message prior to an upcoming primary care visit can increase influenza vaccination rates.
Design: Randomized, controlled trial.
Setting: Two health systems in the Northeastern US between September 2020 and... View Details

Keywords: Vaccination; Health Care and Treatment; Interpersonal Communication; Communication Technology; Behavior; Health Industry

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October 2022
Article

It’s Not Just the Prices: Time-Driven Activity-Based Costing for Initiation of Veno-Venous Extracorporeal Membrane Oxygenation at Three International Sites—A Case Review

By: Michael Nurok, Vin Pellegrino, Marc Pineton de Chambrun, Jonathan Warsh, Meredith Young, Erik Dong, Neil Parrish, Syed Shehab, Alain Combes and Robert S. Kaplan

The United States spends more for intensive care units (ICUs) than do other high-income countries. We used time-driven activity-based costing (TDABC) to analyze ICU costs for initiation of extracorporeal membrane oxygenation (ECMO) for respiratory failure to estimate... View Details

Keywords: Healthcare; Cost; Time-Driven ABC; Health Care and Treatment; Cost Management; Activity Based Costing and Management; Health Industry

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March 2022
Supplement

Ukraine: On the Border of Europe and Eurasia (B)

By: Rawi Abdelal, Jonathan Schlefer and Cressida Arkwright

Supplements the (A) case. Russia’s invasion of Ukraine in February 2022 raised questions about democratization and a possible reshaping of the global order. It arose from deep roots in the history of both nations but also turned on contingent decisions by their... View Details

Keywords: Global Order; Social Issues; Government Administration; History; War; Ukraine; Russia

2022
Working Paper

Markups to Financial Intermediation in Foreign Exchange Markets

By: Jonathan Wallen

On average from 2013 to 2020, foreign asset managers in net sold forward 1.1 trillion U.S. dollars. This forward sale of dollars hedges the currency mismatch of foreign investment in U.S. dollar assets. By accommodating this demand, U.S. and European banks earn an... View Details

Keywords: Foreign Exchange; Financial Intermediation; Arbitrage; Market Power; Regulations; Currency; Assets; Interest Rates; Banking Industry

Article

Policies to Influence Perceptions about COVID-19 Risk: The Case of Maps

By: Claudia Engel, Jonathan Rodden and Marco Tabellini

Choropleth disease maps have become an important tool for informing the public about the risks posed by COVID-19. In a survey conducted in the U.S. state of Georgia in June 2020, we randomly assigned respondents to view either of two maps. The first one reported... View Details

Keywords: Disease Surveillance; Health Pandemics; Risk and Uncertainty; Perception; Policy

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

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2022
Working Paper

Many Markets Make Good Neighbors: Multimarket Contact and Deposit Banking

By: John William Hatfield and Jonathan Wallen

We investigate the relationship between the interest rates offered to consumers in a deposit banking market and the contact that banks in that market have with each other in other markets. We show, in a simple theoretical model, that such overlapping relationships... View Details

Keywords: Antitrust; Deposit Banking; Market Power; Multimarket Contact; Banks and Banking; Markets; Competition

Article

Megastudies Improve the Impact of Applied Behavioural Science

By: Katherine L. Milkman, Dena Gromet, Hung Ho, Joseph S. Kay, Timothy W. Lee, Pepi Pandiloski, Yeji Park, Aneesh Rai, Max Bazerman, John Beshears, Lauri Bonacorsi, Colin Camerer, Edward Chang, Gretchen Chapman, Robert Cialdini, Hengchen Dai, Lauren Eskreis-Winkler, Ayelet Fishbach, James J. Gross, Samantha Horn, Alexa Hubbard, Steven J. Jones, Dean Karlan, Tim Kautz, Erika Kirgios, Joowon Klusowski, Ariella Kristal, Rahul Ladhania, Jens Ludwig, George Loewenstein, Barbara Mellers, Sendhil Mullainathan, Silvia Saccardo, Jann Spiess, Gaurav Suri, Joachim H. Talloen, Jamie Taxer, Yaacov Trope, Lyle Ungar, Kevin G. Volpp, Ashley V. Whillans, Jonathan Zinman and Angela L. Duckworth

Policy-makers are increasingly turning to behavioural science for insights about how to improve citizens’ decisions and outcomes. Typically, different scientists test different intervention ideas in different samples using different outcomes over different time... View Details

Keywords: Policy Making; Behavioral Science; Behavior; Change; Decision Making; Policy

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August 2021
Article

Rate-Amplifying Demand and the Excess Sensitivity of Long-Term Rates

By: Samuel G. Hanson, David O. Lucca and Jonathan H. Wright

Long-term nominal interest rates are surprisingly sensitive to high-frequency (daily or monthly) movements in short-term rates. Since 2000, this high-frequency sensitivity has grown even stronger in U.S. data. By contrast, the association between low-frequency changes... View Details

Keywords: Conundrum; Investor Demand; Monetary Policy Transmission; Interest Rates

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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

2021
Article

Evidence of Decreasing Internet Entropy: The Lack of Redundancy in DNS Resolution by Major Websites and Services

By: Samantha Bates, John Bowers, Shane Greenstein, Jordi Weinstock, Jonathan Zittrain and Yunhan Xu

This paper analyzes the extent to which the Internet’s global domain name resolution (DNS) system has preserved its distributed resilience given the rise of cloud-based hosting and infrastructure. We explore trends in the concentration of the DNS space since at least... View Details

Keywords: Domain Name System; Resilience; Entropy; Internet and the Web; Infrastructure; Performance Effectiveness; Safety; Cybersecurity

April 2021
Teaching Note

Drinkworks: Home Bar by Keurig

By: Sunil Gupta and Jonathan Levav

Teaching Note for HBS Case No. 521-010. In the summer of 2018, Drinkworks CEO Nathaniel Davis needed to make a number of go-to-market decisions ahead of his company’s upcoming product launch. Formed through a joint venture between Keurig Dr. Pepper and Anheuser-Busch... View Details

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

November 2020
Article

Accelerator or Brake? Cash for Clunkers, Household Liquidity, and Aggregate Demand

By: Daniel Green, Brian Melzer, Jonathan Parker and Arcenis Rojas

This paper evaluates the Car Allowance Rebate System (CARS) by comparing the vehicle purchases and disposals of households with eligible "clunkers" to those of households with similar, but ineligible, vehicles. CARS caused roughly 500,000 purchases during the program... View Details

Keywords: Automobiles; Purchasing; Government Incentives; Household; Financial Liquidity; Income; Behavior

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September 2020
Case

Drinkworks: Home Bar by Keurig

By: Sunil Gupta, Jonathan Levav and Julia Kelley

In the summer of 2018, Drinkworks CEO Nathaniel Davis needed to make a number of go-to-market decisions ahead of his company’s upcoming product launch. Formed through a joint venture between Keurig Dr. Pepper and Anheuser-Busch InBev, Drinkworks had developed an... View Details

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