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Publications

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      • 2023
      • Working Paper

      Applications or Approvals: What Drives Racial Disparities in the Paycheck Protection Program?

      By: Sergey Chernenko, Nathan Kaplan, Asani Sarkar and David S. Scharfstein
      We use the 2020 Small Business Credit Survey to study the sources of racial disparities in use of the Paycheck Protection Program (PPP). Black-owned firms are 8.9 percentage points less likely than observably similar white-owned firms to receive PPP loans. About 55% of...  View Details
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      Chernenko, Sergey, Nathan Kaplan, Asani Sarkar, and David S. Scharfstein. "Applications or Approvals: What Drives Racial Disparities in the Paycheck Protection Program?" NBER Working Paper Series, No. 31172, April 2023.
      • April 2023
      • Article

      Racial Inequality in Work Environments

      By: Letian Zhang
      This article explores racial stratification in work environments. Inequality scholars have long identified racial disparities in wage and occupational attainment, but workers’ careers and well-being are also shaped by elements of their work environment, including firm...  View Details
      Keywords: Discrimination; Race; Equality and Inequality; Working Conditions; Personal Development and Career; Organizational Culture
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      Zhang, Letian. "Racial Inequality in Work Environments." American Sociological Review 88, no. 2 (April 2023): 252–283.
      • 2022
      • Working Paper

      Retail Investors’ Contrarian Behavior Around News, Attention, and the Momentum Effect

      By: Cheng (Patrick) Luo, Enrichetta Ravina, Marco Sammon and Luis M. Viceira
      Using a large panel of U.S. brokerage accounts trades and positions, we show that a large fraction of retail investors trade as contrarians after large earnings surprises, especially for loser stocks, and that such contrarian trading contributes to post earnings...  View Details
      Keywords: Retail Investors; Post Earnings Announcement Drift; Price Momentum; Behavioral Finance; Investment; Demographics
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      Luo, Cheng (Patrick), Enrichetta Ravina, Marco Sammon, and Luis M. Viceira. "Retail Investors’ Contrarian Behavior Around News, Attention, and the Momentum Effect." Working Paper, June 2022.
      • 2022
      • Working Paper

      Rethinking Explainability as a Dialogue: A Practitioner's Perspective

      By: Himabindu Lakkaraju, Dylan Slack, Yuxin Chen, Chenhao Tan and Sameer Singh
      As practitioners increasingly deploy machine learning models in critical domains such as healthcare, finance, and policy, it becomes vital to ensure that domain experts function effectively alongside these models. Explainability is one way to bridge the gap between...  View Details
      Keywords: Natural Language Conversations; AI and Machine Learning; Experience and Expertise; Interactive Communication; Business and Stakeholder Relations
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      Lakkaraju, Himabindu, Dylan Slack, Yuxin Chen, Chenhao Tan, and Sameer Singh. "Rethinking Explainability as a Dialogue: A Practitioner's Perspective." Working Paper, 2022.
      • 2021
      • Working Paper

      The Luck of the Draw: The Causal Effect of Physicians on Birth Outcomes

      By: Arlen Guarin, Christian Posso, Estefania Saravia and Jorge Tamayo
      Identifying the effect of physicians’ skills on health outcomes is a challenging task due to the nonrandom sorting between physicians and hospitals. We overcome this challenge by exploiting a Colombian government program that randomly assigned 2,126 physicians to 618...  View Details
      Keywords: Physicians' Health Skills; Health Birth Outcomes; Birthing Outcomes; Experimental Evidence; Health Care and Treatment; Competency and Skills; Outcome or Result; Health Industry; Colombia
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      Guarin, Arlen, Christian Posso, Estefania Saravia, and Jorge Tamayo. "The Luck of the Draw: The Causal Effect of Physicians on Birth Outcomes." Harvard Business School Working Paper, No. 22-015, February 2021. (Revised November 2021.)
      • Article

      Measuring the Scientific Effectiveness of Contact Tracing: Evidence from a Natural Experiment

      By: Thiemo Fetzer and Thomas Graeber
      Contact tracing has for decades been a cornerstone of the public health approach to epidemics, including Ebola, severe acute respiratory syndrome, and now COVID-19. It has not yet been possible, however, to causally assess the method’s effectiveness using a randomized...  View Details
      Keywords: COVID-19; Contact Tracing; Public Health; Infectious Diseases; Health Pandemics
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      Fetzer, Thiemo, and Thomas Graeber. "Measuring the Scientific Effectiveness of Contact Tracing: Evidence from a Natural Experiment." Proceedings of the National Academy of Sciences 118, no. 33 (August 17, 2021): 1–4.
      • 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
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      Milkman, Katherine L., 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. "A Megastudy of Text-Based Nudges Encouraging Patients to Get Vaccinated at an Upcoming Doctor's Appointment." e2101165118. Proceedings of the National Academy of Sciences 118, no. 20 (May 18, 2021).
      • March 12, 2021
      • Article

      Is Your C-Suite Equipped to Lead a Digital Transformation?

      By: J. Yo-Jud Cheng, Cassandra Frangos and Boris Groysberg
      The pandemic has rapidly accelerated many companies’ digital efforts, but do they have the right executives in place to lead this sort of transformation? To answer this question, the authors analyzed more than 100 search specifications for C-suite positions in Fortune...  View Details
      Keywords: Management Teams; Information Technology; Transformation; Competency and Skills; Digital Transformation
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      Cheng, J. Yo-Jud, Cassandra Frangos, and Boris Groysberg. "Is Your C-Suite Equipped to Lead a Digital Transformation?" Harvard Business Review Digital Articles (March 12, 2021).
      • March 2021 (Revised December 2021)
      • Case

      Cedar Environmental: Innovation vs. Corruption in Lebanon?

      By: Nien-hê Hsieh and Youssef Abdel Aal
      The case follows Ziad Abi Chaker, founder and CEO of Cedar Environmental, as he weighs options for how to grow the company in the face of growing economic and political instability in Lebanon in 2019.

      Founded after the Lebanese civil war, Cedar...  View Details
      Keywords: Waste Management; Recycling; Corruption; Leadership & Corporate Accountability; Business And Government; Social Entrepreneurship; Environmental Sustainability; Green Technology; Pollution; Entrepreneurship; Business and Government Relations; Crime and Corruption; Technological Innovation; Growth and Development Strategy; Business Strategy; Expansion; Corporate Accountability; Green Technology Industry; Middle East; Lebanon
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      Hsieh, Nien-hê, and Youssef Abdel Aal. "Cedar Environmental: Innovation vs. Corruption in Lebanon?" Harvard Business School Case 321-114, March 2021. (Revised December 2021.)
      • 2021
      • Working Paper

      Housing Consumption and the Cost of Remote Work

      By: Christopher Stanton and Pratyush Tiwari
      This paper estimates housing choice differences between households with and without remote workers. Prior to the pandemic, the expenditure share on housing was more than seven percent higher for remote households compared to similar non-remote households in the same...  View Details
      Keywords: Remote Work; Geographic Mobility; Housing; Cost; Geographic Location; Income
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      Stanton, Christopher, and Pratyush Tiwari. "Housing Consumption and the Cost of Remote Work." NBER Working Paper Series, No. 28483, February 2021.
      • December 2020 (Revised December 2022)
      • Case

      The Dance of Dharma: On the Difficulty of Being Good

      By: Arthur I. Segel and Tyler M. Richard
      When deciding how to be good and act well, we often seek outside help. Many of our oldest and most frequently consulted sources of ethical guidance are our religious traditions. Just as one might consult a thoughtful friend, countless people seek direction from their...  View Details
      Keywords: Hinduism; Ethics; Religion; Values and Beliefs; Decision Making
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      Segel, Arthur I., and Tyler M. Richard. "The Dance of Dharma: On the Difficulty of Being Good." Harvard Business School Case 821-058, December 2020. (Revised December 2022.)
      • Fall 2020
      • Article

      Business Credit Programs in the Pandemic Era

      By: Samuel G. Hanson, Jeremy C. Stein, Adi Sunderam and Eric Zwick
      We develop a pair of models that speak to the goals and design of the sort of business-lending and corporate-bond purchase programs that have been introduced by governments in response to the ongoing COVID-19 pandemic. An overarching theme is that, in contrast to the...  View Details
      Keywords: COVID-19; Business Lending; Government Intervention; Econometric Models; Health Pandemics; Credit; Governance; Policy
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      Hanson, Samuel G., Jeremy C. Stein, Adi Sunderam, and Eric Zwick. "Business Credit Programs in the Pandemic Era." Brookings Papers on Economic Activity (Fall 2020).
      • July 2020
      • Article

      Recovering the Logic of Double Effect for Business: Intentions, Proportionality, and Impermissible Harms

      By: Rosemarie Monge and Nien-hê Hsieh
      Business actors often act in ways that may harm other parties. While the law aims to restrict harmful behavior and to provide remedies, legal systems do not anticipate all contingencies and legal regulations are not always well enforced. This article argues that the...  View Details
      Keywords: Double Effect; Intention; Exploitation; Risk; Practical Ethics; Competition; Risk and Uncertainty; Ethics
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      Monge, Rosemarie, and Nien-hê Hsieh. "Recovering the Logic of Double Effect for Business: Intentions, Proportionality, and Impermissible Harms." Business Ethics Quarterly 30, no. 3 (July 2020): 361–387. (doi: 10.1017/beq.2019.39.)
      • May 8, 2020
      • Article

      Which Covid-19 Data Can You Trust?

      By: Satchit Balsari, Caroline Buckee and Tarun Khanna
      The COVID-19 pandemic has produced a tidal wave of data, but how much of it is any good? And as a layperson, how can you sort the good from the bad? The authors suggest a few strategies for dividing the useful data from the misleading: Beware of data that’s too broad...  View Details
      Keywords: COVID-19 Pandemic; Health Pandemics; Analytics and Data Science
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      Balsari, Satchit, Caroline Buckee, and Tarun Khanna. "Which Covid-19 Data Can You Trust?" Harvard Business Review (website) (May 8, 2020).
      • 2020
      • Working Paper

      No Line Left Behind: Assortative Matching Inside the Firm

      By: Achyuta Adhvaryu, Vittorio Bassi, Anant Nyshadham and Jorge Tamayo
      How do firms pair workers with managers, and which constraints affect the allocation of labor within the firm? We characterize the sorting pattern of managers to workers in a large readymade garment manufacturer in India and then explore potential drivers of the...  View Details
      Keywords: Assortative Matching; Productivity; Global Buyers; Readymade Garments; Management; Employees; Performance Productivity
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      Adhvaryu, Achyuta, Vittorio Bassi, Anant Nyshadham, and Jorge Tamayo. "No Line Left Behind: Assortative Matching Inside the Firm." Harvard Business School Working Paper, No. 20-103, March 2020. (R&R Review of Economics and Statistics.)
      • December 2019
      • Article

      Costly Concessions: An Empirical Framework for Matching with Imperfectly Transferable Utility

      By: Alfred Galichon, Scott Duke Kominers and Simon Weber
      We introduce an empirical framework for models of matching with imperfectly transferable utility and unobserved heterogeneity in tastes. Our framework allows us to characterize matching equilibrium in a flexible way that includes as special cases the classic fully- and...  View Details
      Keywords: Sorting; Matching; Marriage Market; Intrahousehold Allocation; Imperfectly Transferable Utility; Marketplace Matching; Mathematical Methods
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      Galichon, Alfred, Scott Duke Kominers, and Simon Weber. "Costly Concessions: An Empirical Framework for Matching with Imperfectly Transferable Utility." Journal of Political Economy 127, no. 6 (December 2019): 2875–2925.
      • March–April 2019
      • Article

      The Future of Leadership Development

      By: Das Narayandas and Mihnea Moldoveanu
      The need for leadership development has never been more urgent. Companies of all sorts realize that to survive in today’s volatile, uncertain, complex, and ambiguous environment, they need different leadership skills and organizational capabilities from those that...  View Details
      Keywords: Talent Management; Executive Education; Leadership Development; Business Education; Management Skills; Learning; Online Technology
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      Narayandas, Das, and Mihnea Moldoveanu. "The Future of Leadership Development." Harvard Business Review 97, no. 4 (March–April 2019): 40–48. (Spotlight Talent Management.)
      • February 2019
      • Case

      Canibal—Play It Green!

      By: Frank V. Cespedes, Joseph B. Fuller, Tonia Labruyere and Elena Corsi
      In 2011, Canibal launched a machine that could sort and compress aluminum cans, plastic bottles, and cups. Users could play a jackpot-style game on the machine’s digital display, while disposing of their beverage containers and earning coupons or other rewards. The...  View Details
      Keywords: Sales Growth; Recycling; Start-up; Scaling; Market Selection; Sales; Marketing; Business Startups; Growth and Development Strategy; Segmentation; Product Positioning; Technology Industry; France
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      Cespedes, Frank V., Joseph B. Fuller, Tonia Labruyere, and Elena Corsi. "Canibal—Play It Green!" Harvard Business School Case 319-089, February 2019.
      • January 2019 (Revised January 2022)
      • Case

      Chinese Infrastructure Investments in Sri Lanka: A Pearl or a Teardrop on the Belt and Road?

      By: Meg Rithmire and Yihao Li
      In 2015, a surprise presidential election result seemed to imperil Chinese investments in Sri Lanka, which were associated with China’s Belt and Road Initiative to build global infrastructure. In the previous decade, China had undertaken two major projects in the...  View Details
      Keywords: Belt And Road Initiative; Investment; Infrastructure; China; Sri Lanka
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      Rithmire, Meg, and Yihao Li. "Chinese Infrastructure Investments in Sri Lanka: A Pearl or a Teardrop on the Belt and Road?" Harvard Business School Case 719-046, January 2019. (Revised January 2022.)
      • January 2019 (Revised December 2020)
      • Case

      Angola Starts Now

      By: Jeremy Friedman and Sophus A. Reinert
      After five centuries of colonialism, four decades of civil war, an extended experiment with Marxism-Leninism, and nearly four decades of rule by a single man, José Eduardo Dos Santos, Angola finally has a chance to realize its enormous economic potential. A country...  View Details
      Keywords: Development Economics; Government and Politics; History; Governing Rules, Regulations, and Reforms; Social Issues; Angola
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      Friedman, Jeremy, and Sophus A. Reinert. "Angola Starts Now." Harvard Business School Case 719-007, January 2019. (Revised December 2020.)
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