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Publications

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    • All HBS Web  (480)
      • Faculty Publications  (57)

      Measuring EfficiencyRemove Measuring Efficiency →

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      • 2025
      • Working Paper

      Private Equity and Workers: Modeling and Measuring Monopsony, Reallocation, and Trust

      By: Kyle Herkenhoff, Josh Lerner, Gordon M. Phillips, Francisca Rebelo and Benjamin Sampson
      We measure the real effects of private equity buyouts on worker outcomes by building a new database that links transactions to matched employer-employee data in the United States. To guide our empirical analysis, we derive testable implications from three theories in... View Details
      Keywords: Monopsony; Market Power; Productivity; Private Equity; Employment; Wages; Employees
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      Herkenhoff, Kyle, Josh Lerner, Gordon M. Phillips, Francisca Rebelo, and Benjamin Sampson. "Private Equity and Workers: Modeling and Measuring Monopsony, Reallocation, and Trust." Harvard Business School Working Paper, No. 25-046, March 2025.
      • February 2025
      • Article

      Variation in Batch Ordering of Imaging Tests in the Emergency Department and the Impact on Care Delivery

      By: Jacob C. Jameson, Soroush Saghafian, Robert S. Huckman and Nicole Hodgson
      Objectives: To examine heterogeneity in physician batch ordering practices and measure the impact of a physician's tendency to batch order imaging tests on patient outcomes and resource utilization.
      Study Setting and Design: In this retrospective study, we used... View Details
      Keywords: Health Care; Operations Management; Productivity; Health Care and Treatment; Operations; Outcome or Result; Resource Allocation; Health Industry; United States
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      Jameson, Jacob C., Soroush Saghafian, Robert S. Huckman, and Nicole Hodgson. "Variation in Batch Ordering of Imaging Tests in the Emergency Department and the Impact on Care Delivery." Health Services Research 60, no. 1 (February 2025).
      • August 2024
      • Technical Note

      Measuring Concentrated Ownership

      By: Christina R. Wing, Everett Alexander and Justin Huang
      Firms with strong governance practices exhibit lower control premiums due to reduced risks and more efficient operations. Conversely, poorly governed firms may exhibit higher control premiums as new owners anticipate the need for substantial governance improvements.... View Details
      Keywords: Concentrated Ownership; Ownership; Corporate Governance; Valuation
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      Wing, Christina R., Everett Alexander, and Justin Huang. "Measuring Concentrated Ownership." Harvard Business School Technical Note 625-031, August 2024.
      • June 2024
      • Article

      Real Growth in Space Manufacturing Output Substantially Exceeds Growth in the Overall Space Economy

      By: Tina Highfill and Matthew Weinzierl
      Accurately measuring real economic output in the space economy is made difficult by the rapid increase in capabilities and decrease in prices of launch and satellite technologies achieved over the past two decades. Nominal measures of output in space will tend to... View Details
      Keywords: Technological Innovation; Economic Growth; Price; Production; Aerospace Industry
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      Highfill, Tina, and Matthew Weinzierl. "Real Growth in Space Manufacturing Output Substantially Exceeds Growth in the Overall Space Economy." Acta Astronautica 219 (June 2024): 236–242.
      • 2024
      • Article

      Half the Firms, Double the Profits: Public Firms' Transformation, 1996–2022

      By: Mark J. Roe and Charles C.Y. Wang
      The number of public firms in the United States has halved since the beginning of the twenty-first century, causing consternation among corporate and securities law regulators. The dominant explanations, often advanced by Securities and Exchange commissioners when... View Details
      Keywords: Corporate Law; Securities Regulation; Sarbanes-Oxley Act; Concentration Levels; Antitrust; Initial Public Offering; Public Ownership; Private Equity; Venture Capital; Mergers and Acquisitions; Monopoly; United States
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      Roe, Mark J., and Charles C.Y. Wang. "Half the Firms, Double the Profits: Public Firms' Transformation, 1996–2022." Journal of Law, Finance, and Accounting 8, no. 2 (2024): 211–264.
      • August 2023 (Revised March 2024)
      • Case

      Arla Foods: Data-Driven Decarbonization (A)

      By: Michael Parzen, Michael W. Toffel, Susan Pinckney and Amram Migdal
      The case describes Arla’s history, in particular its climate change mitigation efforts, and how it implemented a price incentive system to motivate individual farms to implement scope 1 greenhouse gas emissions mitigation measures and receive a higher milk price. The... View Details
      Keywords: Dairy Industry; Business Earnings; Agribusiness; Animal-Based Agribusiness; Acquisition; Mergers and Acquisitions; Decision Making; Decisions; Voting; Environmental Management; Climate Change; Environmental Regulation; Environmental Sustainability; Green Technology; Pollution; Moral Sensibility; Values and Beliefs; Financial Strategy; Price; Profit; Revenue; Food; Geopolitical Units; Global Strategy; Ownership Type; Cooperative Ownership; Performance Efficiency; Performance Evaluation; Problems and Challenges; Natural Environment; Science-Based Business; Business Strategy; Commercialization; Cooperation; Corporate Strategy; Food and Beverage Industry; Agriculture and Agribusiness Industry; Europe; United Kingdom; European Union; Germany; Denmark; Sweden; Luxembourg; Belgium
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      Parzen, Michael, Michael W. Toffel, Susan Pinckney, and Amram Migdal. "Arla Foods: Data-Driven Decarbonization (A)." Harvard Business School Case 624-003, August 2023. (Revised March 2024.)
      • August 2023 (Revised January 2024)
      • Supplement

      Arla Foods: Data-Driven Decarbonization (B)

      By: Michael Parzen, Michael W. Toffel, Susan Pinckney and Amram Migdal
      The case describes Arla’s history, in particular its climate change mitigation efforts, and how it implemented a price incentive system to motivate individual farms to implement scope 1 greenhouse gas emissions mitigation measures and receive a higher milk price. The... View Details
      Keywords: Dairy Industry; Earnings Management; Environmental Accounting; Animal-Based Agribusiness; Mergers and Acquisitions; Decisions; Voting; Climate Change; Environmental Regulation; Environmental Sustainability; Green Technology; Pollution; Moral Sensibility; Values and Beliefs; Financial Strategy; Price; Profit; Revenue; Food; Geopolitical Units; Cross-Cultural and Cross-Border Issues; Global Strategy; Cooperative Ownership; Performance Efficiency; Performance Evaluation; Problems and Challenges; Natural Environment; Science-Based Business; Business Strategy; Commercial Banking; Cooperation; Corporate Strategy; Motivation and Incentives; Food and Beverage Industry; Agriculture and Agribusiness Industry; Europe; United Kingdom; European Union; Denmark; Sweden; Luxembourg; Belgium
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      Parzen, Michael, Michael W. Toffel, Susan Pinckney, and Amram Migdal. "Arla Foods: Data-Driven Decarbonization (B)." Harvard Business School Supplement 624-036, August 2023. (Revised January 2024.)
      • 2023
      • Working Paper

      Feature Importance Disparities for Data Bias Investigations

      By: Peter W. Chang, Leor Fishman and Seth Neel
      It is widely held that one cause of downstream bias in classifiers is bias present in the training data. Rectifying such biases may involve context-dependent interventions such as training separate models on subgroups, removing features with bias in the collection... View Details
      Keywords: AI and Machine Learning; Analytics and Data Science; Prejudice and Bias
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      Chang, Peter W., Leor Fishman, and Seth Neel. "Feature Importance Disparities for Data Bias Investigations." Working Paper, March 2023.
      • March 2023
      • Background Note

      A Primer on OKRs

      By: Suraj Srinivasan and Li-Kuan (Jason) Ni
      The OKR framework is a popular goal-setting and strategy execution tool that uses goal setting through “Objectives” and measuring performance using “Key Results” on a periodic basis to measure and drive performance. The OKR framework has been adopted and practiced at... View Details
      Keywords: Business Organization; Talent and Talent Management; Framework; Corporate Governance; Goals and Objectives; Growth and Development; Growth and Development Strategy; Growth Management; Management Analysis, Tools, and Techniques; Management Practices and Processes; Management Skills; Management Systems; Measurement and Metrics; Outcome or Result; Performance Effectiveness; Performance Evaluation; Performance Expectations; Performance Productivity; Performance Efficiency
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      Srinivasan, Suraj, and Li-Kuan (Jason) Ni. "A Primer on OKRs." Harvard Business School Background Note 123-081, March 2023.
      • September 2022
      • Technical Note

      Addressing Social Determinants of Health in the American Landscape

      By: Susanna Gallani and Jacob Riegler
      Social determinants of health (SDOH) have gained significant attention in recent years. A growing body of research shows that a person’s health is influenced by a large number of non-genetic factors, most of which operate outside the realm of health care and are... View Details
      Keywords: Socioeconomic Determinants Of Health; Social Determinants Of Health; Population Health; Health; Health Care and Treatment; Social Issues; Health Industry; Insurance Industry; Medical Devices and Supplies Industry; United States
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      Gallani, Susanna, and Jacob Riegler. "Addressing Social Determinants of Health in the American Landscape." Harvard Business School Technical Note 123-023, September 2022.
      • August, 2022
      • Article

      Billing and Insurance-Related Administrative Costs: A Cross-National Analysis

      By: Barak D. Richman, Robert S. Kaplan, Japees Kohli, Dennis Purcell, Mahek Shah, Igna Bonfrer, Brian Golden, Rosemary Hannam, Will Mitchell, Daniel Cehic, Garry Crispin and Kevin A. Schulman
      Billing and insurance-related costs are a significant source of wasteful health care spending in Organization for Economic Cooperation and Development nations, but these administrative burdens vary across national systems. We executed a microlevel accounting of these... View Details
      Keywords: Health Care Costs; Administrative Costs; Cost; Health Care and Treatment; Health Industry
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      Richman, Barak D., Robert S. Kaplan, Japees Kohli, Dennis Purcell, Mahek Shah, Igna Bonfrer, Brian Golden, Rosemary Hannam, Will Mitchell, Daniel Cehic, Garry Crispin, and Kevin A. Schulman. "Billing and Insurance-Related Administrative Costs: A Cross-National Analysis." Health Affairs 41, no. 8 (August, 2022): 1098–1106.
      • March 2022 (Revised January 2023)
      • Case

      Innovation at Moog Inc.

      By: Brian J. Hall, Ashley V. Whillans, Davis Heniford, Dominika Randle and Caroline Witten
      This case focuses on the challenges of incentivizing innovation within Moog, an engineering company based in New York state that designs and builds guidance systems for space, air, and land-based travel. The case enables students to grapple with the challenges of using... View Details
      Keywords: Innovation; Innovation Lab; Innovation Management; Motivation; Incentives; Culture; Compensation; Compensation And Benefits; Scalability; Business Growth and Maturation; Collaborative Innovation and Invention; Independent Innovation and Invention; Innovation and Management; Innovation Leadership; Innovation Strategy; Organizational Culture; Performance Consistency; Performance Effectiveness; Performance Efficiency; Performance Productivity; Performance Evaluation; Creativity; Motivation and Incentives; Aerospace Industry; Transportation Industry; United States
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      Hall, Brian J., Ashley V. Whillans, Davis Heniford, Dominika Randle, and Caroline Witten. "Innovation at Moog Inc." Harvard Business School Case 922-040, March 2022. (Revised January 2023.)
      • 2022
      • Chapter

      Key Success Factors in Environmental Entrepreneurship: The Case of Wilderness Safaris

      By: James E. Austin, Megan Epler Woods and Herman B. Leonard
      This chapter analyzes the entrepreneurial conception and evolution of the Wilderness Safaris (WS) ecotourism enterprise operating in eight African countries. It illuminates a series of factors that contribute to positive environmental impact as well as financial... View Details
      Keywords: Environmental Sustainability; Entrepreneurship
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      Austin, James E., Megan Epler Woods, and Herman B. Leonard. "Key Success Factors in Environmental Entrepreneurship: The Case of Wilderness Safaris." Chap. 7 in World Scientific Encyclopedia of Business Sustainability, Ethics, and Entrepreneurship, Volume 1: Environmental and Social Entrepreneurship, edited by Peter Gianiodis, Maritza I. Espina, and William R. Meek, 175–196. World Scientific Publishing, 2022.
      • Article

      Pattern Detection in the Activation Space for Identifying Synthesized Content

      By: Celia Cintas, Skyler Speakman, Girmaw Abebe Tadesse, Victor Akinwande, Edward McFowland III and Komminist Weldemariam
      Generative Adversarial Networks (GANs) have recently achieved unprecedented success in photo-realistic image synthesis from low-dimensional random noise. The ability to synthesize high-quality content at a large scale brings potential risks as the generated samples may... View Details
      Keywords: Subset Scanning; Generative Models; Synthetic Content Detection
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      Cintas, Celia, Skyler Speakman, Girmaw Abebe Tadesse, Victor Akinwande, Edward McFowland III, and Komminist Weldemariam. "Pattern Detection in the Activation Space for Identifying Synthesized Content." Pattern Recognition Letters 153 (January 2022): 207–213.
      • October 1, 2021
      • Article

      An Evaluation of Cross-efficiency Methods: With an Application to Warehouse Performance.

      By: B.M. Balk, M.R. De Koster, Christian Kaps and J.L. Zofio
      Cross-efficiency measurement is an extension of Data Envelopment Analysis that allows for tie-breaking ranking of the Decision Making Units (DMUs) using all the peer evaluations. In this article we examine the theory of cross-efficiency measurement by comparing a... View Details
      Keywords: Efficiency Analysis; Performance Benchmarking; Warehousing; Analytics and Data Science; Performance Evaluation; Measurement and Metrics; Mathematical Methods
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      Balk, B.M., M.R. De Koster, Christian Kaps, and J.L. Zofio. "An Evaluation of Cross-efficiency Methods: With an Application to Warehouse Performance." Art. 126261. Applied Mathematics and Computation 406 (October 1, 2021).
      • July 2021
      • Article

      Outsourcing Tasks Online: Matching Supply and Demand on Peer-to-Peer Internet Platforms

      By: Zoë Cullen and Chiara Farronato
      We study the growth of online peer-to-peer markets. Using data from TaskRabbit, an expanding marketplace for domestic tasks at the time of our study, we show that growth varies considerably across cities. To disentangle the potential drivers of growth, we look... View Details
      Keywords: Two-sided Market; Two-sided Platforms; Peer-to-peer Markets; Platform Strategy; Sharing Economy; Platform Growth; Internet and the Web; Digital Platforms; Strategy; Market Design; Network Effects
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      Cullen, Zoë, and Chiara Farronato. "Outsourcing Tasks Online: Matching Supply and Demand on Peer-to-Peer Internet Platforms." Management Science 67, no. 7 (July 2021): 3985–4003.
      • Article

      Diversity and Team Performance in a Kenyan Organization

      By: Benjamin Marx, Vincent Pons and Tavneet Suri
      We present the results from a field experiment on team diversity. Individuals working as door-to-door canvassers for a non-profit organization were randomly assigned a teammate, a supervisor, and a list of individuals to canvass. This created random variation within... View Details
      Keywords: Ethnic Diversity; Organizational Behavior; Labor Management; Groups and Teams; Diversity; Performance
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      Marx, Benjamin, Vincent Pons, and Tavneet Suri. "Diversity and Team Performance in a Kenyan Organization." Art. 104332. Journal of Public Economics 197 (May 2021).
      • 2021
      • Article

      Fair Influence Maximization: A Welfare Optimization Approach

      By: Aida Rahmattalabi, Shahin Jabbari, Himabindu Lakkaraju, Phebe Vayanos, Max Izenberg, Ryan Brown, Eric Rice and Milind Tambe
      Several behavioral, social, and public health interventions, such as suicide/HIV prevention or community preparedness against natural disasters, leverage social network information to maximize outreach. Algorithmic influence maximization techniques have been proposed... View Details
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      Rahmattalabi, Aida, Shahin Jabbari, Himabindu Lakkaraju, Phebe Vayanos, Max Izenberg, Ryan Brown, Eric Rice, and Milind Tambe. "Fair Influence Maximization: A Welfare Optimization Approach." Proceedings of the AAAI Conference on Artificial Intelligence 35th (2021).
      • Article

      A Feasibility Study Using Time-driven Activity-based Costing as a Management Tool for Provider Cost Estimation: Lessons from the National TB Control Program in Zimbabwe in 2018

      By: J. Chirenda, B. Nhlema Simwaka, C. Sandy, K. Bodnar, S. Corbin, P. Desai, T. Mapako, S. Shamu, C. Timire, E. Antonio, A. Makone, A. Birikorang, T. Mapuranga, M. Ngwenya, T. Masunda, M. Dube, E. Wandwalo, L. Morrison and R. S. Kaplan
      Background: This study used process maps and time-driven activity-based costing to document TB service delivery processes. The analysis identified the resources required to sustain TB services in Zimbabwe, as well as several opportunities for more effective and... View Details
      Keywords: Time-Driven Activity-Based Costing; Provider Cost; Health Care and Treatment; Cost Management; Activity Based Costing and Management; Zimbabwe
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      Chirenda, J., B. Nhlema Simwaka, C. Sandy, K. Bodnar, S. Corbin, P. Desai, T. Mapako, S. Shamu, C. Timire, E. Antonio, A. Makone, A. Birikorang, T. Mapuranga, M. Ngwenya, T. Masunda, M. Dube, E. Wandwalo, L. Morrison, and R. S. Kaplan. "A Feasibility Study Using Time-driven Activity-based Costing as a Management Tool for Provider Cost Estimation: Lessons from the National TB Control Program in Zimbabwe in 2018." BMC Health Services Research 21, no. 242 (2021).
      • 2020
      • Working Paper

      Social Interactions in Pandemics: Fear, Altruism, and Reciprocity

      By: Laura Alfaro, Ester Faia, Nora Lamersdorf and Farzad Saidi
      In SIR models, homogeneous or with a network structure, infection rates are assumed to be exogenous. However, individuals adjust their behavior. Using daily data for 89 cities worldwide, we document that mobility falls in response to fear, as approximated by Google... View Details
      Keywords: Social Interactions; Pandemics; Mobility; Cities; SIR Networks; Social Preferences; Social Planner; Targeted Policies; Health Pandemics; Interpersonal Communication; Behavior; Policy
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      Alfaro, Laura, Ester Faia, Nora Lamersdorf, and Farzad Saidi. "Social Interactions in Pandemics: Fear, Altruism, and Reciprocity." NBER Working Paper Series, No. 27134, May 2020.
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