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    • All HBS Web  (366)
      • Faculty Publications  (58)

      by Christian KetelsRemove by Christian Ketels →

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      • December 2024
      • Article

      Proximate (Co-)Working: Knowledge Spillovers and Social Interactions

      By: Maria P. Roche, Alexander Oettl and Christian Catalini
      We examine the influence of physical proximity on between-start-up knowledge spillovers at one of the largest technology coworking hubs in the United States. Relying on the exogenous assignment of office space to the hub’s 251 start-ups, we find that proximity... View Details
      Keywords: Knowledge Integration; Coworking; Microgeography; Business Startups; Technology Adoption; Diversity; Interpersonal Communication; Knowledge Sharing; Geographic Location
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      Roche, Maria P., Alexander Oettl, and Christian Catalini. "Proximate (Co-)Working: Knowledge Spillovers and Social Interactions." Management Science 70, no. 12 (December 2024).
      • October 2024 (Revised November 2024)
      • Case

      SWEN Blue Ocean: Impact Investing Goes to Sea

      By: Vikram S Gandhi and David Allen
      In August 2023, SWEN Blue Ocean, a €170 million impact fund that invested in startups contributing to ocean sustainability, faced a critical investment decision. Part of SWEN Capital Partners, an €8 billion, Paris-based private equity fund, Blue Ocean was co-founded in... View Details
      Keywords: Communication Technology; Environmental Sustainability; Green Technology; Venture Capital; Private Equity; Investment Funds; Science-Based Business; Technological Innovation; Financial Services Industry; France; Paris; Italy
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      Gandhi, Vikram S., and David Allen. "SWEN Blue Ocean: Impact Investing Goes to Sea." Harvard Business School Case 325-013, October 2024. (Revised November 2024.)
      • 2024
      • Working Paper

      When Batteries Meet Hydrogen: Dual-Storage Investments for Load-Shifting Purposes

      By: Christian Kaps and Simone Marinesi
      Power systems account for nearly 40% of global emissions. As the world tries to reduce emissions by increasing renewable penetration, storage technologies are playing an increasingly important role in matching variable renewable supply with demand. Batteries have... View Details
      Keywords: Environmental Sustainability; Renewable Energy; Transition; Utilities Industry; Battery Industry
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      Kaps, Christian, and Simone Marinesi. "When Batteries Meet Hydrogen: Dual-Storage Investments for Load-Shifting Purposes." Working Paper, October 2024.
      • December 2023
      • Article

      When Should the Off-Grid Sun Shine at Night? Optimum Renewable Generation and Energy Storage Investments

      By: Christian Kaps, Simone Marinesi and Serguei Netessine
      Globally, 1.5 billion people live off the grid, their only access to electricity often limited to operationally-expensive fossil fuel generators. Solar power has risen as a sustainable and less costly option, but its generation is variable during the day and... View Details
      Keywords: Energy; Renewable Energy
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      Kaps, Christian, Simone Marinesi, and Serguei Netessine. "When Should the Off-Grid Sun Shine at Night? Optimum Renewable Generation and Energy Storage Investments." Management Science 69, no. 12 (December 2023): 7633–7650.
      • 2025
      • Working Paper

      Residential Battery Storage - Reshaping the Way We Do Electricity

      By: Christian Kaps and Serguei Netessine
      In this paper, we aim to understand when private households invest in behind-the-meter battery storage next to rooftop solar and how those batteries impact households, the electricity market, and emissions. We answer three main research questions: 1) When do customers... View Details
      Keywords: Solar Power; Energy Storage; Technology And Innovation Management; Energy; Energy Policy; Renewable Energy; Technological Innovation; Innovation and Management; Energy Industry
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      Kaps, Christian, and Serguei Netessine. "Residential Battery Storage - Reshaping the Way We Do Electricity." Working Paper, February 2025.
      • 2025
      • Working Paper

      When Where Watt: Harnessing the Value of Time and Location for Renewable Electricity Generation

      By: Vishrut Rana, Christian Kaps and Serguei Netessine
      Problem definition: Investments in renewable energy have surged worldwide in recent years, with over $2 trillion spent globally on clean energy. This surge was driven by growing policy support, concerns about energy security, and, most importantly, the cost... View Details
      Keywords: Wind Power; Electricity Distribution; Renewable Energy; Profit; Investment Return; Factories, Labs, and Plants; Geographic Location; Revenue; Energy Industry; Utilities Industry
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      Rana, Vishrut, Christian Kaps, and Serguei Netessine. "When Where Watt: Harnessing the Value of Time and Location for Renewable Electricity Generation." Working Paper, January 2025.
      • July 2023
      • Case

      Crocs: Using Community-Centric Marketing to Make Ugly Iconic

      By: Ayelet Israeli and Anne V. Wilson
      In 2022, the Crocs Classic Clog was the best-selling item of clothing on Amazon, the brand was one of the fastest growing brands in the U.S., and global net revenue had increased to approximately $3.6 billion. By most accounts, Crocs had become the “it” shoe. Crocs... View Details
      Keywords: Brands and Branding; Product Development; Growth and Development; Customer Value and Value Chain; Digital Marketing; Digital Strategy; Segmentation; Advertising; Consumer Products Industry; Apparel and Accessories Industry; United States
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      Israeli, Ayelet, and Anne V. Wilson. "Crocs: Using Community-Centric Marketing to Make Ugly Iconic." Harvard Business School Case 524-006, July 2023.
      • 13 Jan 2023 - 14 Jan 2023
      • Conference Presentation

      India’s Quest for Sustainable Growth in a New Global Reality:: The Need for a Region- and Sector-Driven Approach

      By: Christian H.M. Ketels and Michael E. Porter
      Keywords: Sustainable Growth; Economic Development; Economic Growth; Developing Countries and Economies; Employment; India
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      Ketels, Christian H.M., and Michael E. Porter. "India’s Quest for Sustainable Growth in a New Global Reality: The Need for a Region- and Sector-Driven Approach." Paper presented at the 2nd Global Conference on Regional Development, Talent Institute and Tsinghua University, School of Public Policy and Management, Shenzen, China, January 13–14, 2023.
      • 2022
      • Report

      Competitiveness Roadmap for India@100

      By: Michael E. Porter and Christian H.M. Ketels
      The Competitiveness Roadmap for India lays out policy principles to guide India's efforts to move towards middle-income and beyond over the next 25 years. It covers a discussion of appropriate outcome ambitions, the underlying development approach, specific policy... View Details
      Keywords: Economic Growth; Strategy; Competition; Policy; Government Administration; India
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      Porter, Michael E., and Christian H.M. Ketels. "Competitiveness Roadmap for India@100." Report, Institute for Competitiveness, India, September 2022.
      • 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).
      • 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. (R&R American Economic Journal.)
      • Article

      Bitcoin and Beyond

      By: Christian Catalini, Ravi Jagadeesan and Scott Duke Kominers
      From the growing attention to Bitcoin and "decentralized finance" to the latest excitement spurred by non-fungible tokens, the crypto economy is here to stay. But will it develop the social consensus and institutional arrangements needed to go fully mainstream? View Details
      Keywords: Cryptocurrency; Crypto Economy; Finance; Currency
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      Catalini, Christian, Ravi Jagadeesan, and Scott Duke Kominers. "Bitcoin and Beyond." Project Syndicate (April 23, 2021).
      • February 2021
      • Case

      Apple: Privacy vs. Safety (A)

      By: Henry McGee, Nien-hê Hsieh, Sarah McAra and Christian Godwin
      In 2015, Apple CEO Tim Cook debuted the iPhone 6S with enhanced security measures that enflamed a debate on privacy and public safety around the world. The iPhone 6S, amid a heightened concern for privacy following the 2013 revelation of clandestine U.S. surveillance... View Details
      Keywords: Iphone; Encryption; Data Privacy; Customers; Customer Focus and Relationships; Decision Making; Ethics; Values and Beliefs; Globalized Firms and Management; Government and Politics; National Security; Law; Law Enforcement; Leadership; Markets; Safety; Social Issues; Corporate Social Responsibility and Impact; Civil Society or Community; Mobile and Wireless Technology; Technology Industry; Consumer Products Industry; Telecommunications Industry; Electronics Industry; United States; China; Hong Kong
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      McGee, Henry, Nien-hê Hsieh, Sarah McAra, and Christian Godwin. "Apple: Privacy vs. Safety (A)." Harvard Business School Case 321-004, February 2021.
      • February 2021 (Revised March 2023)
      • Supplement

      The Coronavirus (COVID-19) Pandemic and the Global Economy (B)

      By: Alberto Cavallo and Christian Godwin
      By December 2020, the COVID-19 pandemic had swept across the globe, creating widespread disruption in all aspects of everyday life. Almost 90 million people had been infected and nearly two million had died from the disease. By this point in the pandemic—a year since... View Details
      Keywords: COVID-19 Pandemic; Economy; Health Pandemics; Economic Slowdown and Stagnation; Global Range; Crisis Management; Disruption
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      Cavallo, Alberto, and Christian Godwin. "The Coronavirus (COVID-19) Pandemic and the Global Economy (B)." Harvard Business School Supplement 721-434, February 2021. (Revised March 2023.)
      • February 2021
      • Article

      Rethinking the Role of the EU in European Competitiveness

      By: Christian H.M. Ketels and Michael E. Porter
      The aim of this conceptual paper is to delineate the scope and give directives towards higher levels of competitiveness and prosperity for EU members. The EU integration history and challenges are retraced and the EU’s current competitiveness context is presented. In a... View Details
      Keywords: Competitiveness; Public Policy; Competitive Advantage; Government Administration; European Union
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      Ketels, Christian H.M., and Michael E. Porter. "Rethinking the Role of the EU in European Competitiveness." Competitiveness Review 31, no. 2 (February 2021): 189–207.
      • 2019
      • Chapter

      Problem, Person, and Pathway: A Framework for Social Innovators

      By: Julie Battilana, Brittany Butler, Marissa Kimsey, Johanna Mair, Christopher Marquis and Christian Seelos
      As the appetite for learning about social innovation intensifies, how can we better prepare practitioners for the work of addressing the world’s pressing social problems at the relevant scale? This chapter presents the “3P” framework that we developed to help address... View Details
      Keywords: Social Innovation; Social Entrepreneurship; Social Issues; Change; Problems and Challenges
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      Battilana, Julie, Brittany Butler, Marissa Kimsey, Johanna Mair, Christopher Marquis, and Christian Seelos. "Problem, Person, and Pathway: A Framework for Social Innovators." In Handbook of Inclusive Innovation: The Role of Organizations, Markets and Communities in Social Innovation, edited by Gerard George, Ted Baker, Paul Tracey, and Havovi Joshi, 61–74. Cheltenham, UK: Edward Elgar Publishing, 2019.
      • 2018
      • Working Paper

      Towards a New Approach for Upgrading Europe's Competitiveness

      By: Christian Ketels and Michael E. Porter
      The traumatic experience of the European sovereign debt crisis, followed by the outcome of the British referendum on leaving the European Union, has sent shockwaves through Europe. For the first time since the signing of the Treaties of Rome six decades ago, the very... View Details
      Keywords: Competitiveness; Economy; Policy; Problems and Challenges; Europe; European Union
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      Ketels, Christian, and Michael E. Porter. "Towards a New Approach for Upgrading Europe's Competitiveness." Harvard Business School Working Paper, No. 19-033, September 2018.
      • April 2018
      • Teaching Note

      Growing a Cluster: The Singapore Biomedical Sciences Initiative

      By: Michael Porter and Christian Ketels
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      Porter, Michael, and Christian Ketels. "Growing a Cluster: The Singapore Biomedical Sciences Initiative." Harvard Business School Teaching Note 718-466, April 2018.
      • April 2018 (Revised September 2019)
      • Case

      Growing a Cluster: The Singapore Biomedical Sciences Initiative

      By: Michael Porter and Christian H.M. Ketels
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      Porter, Michael, and Christian H.M. Ketels. "Growing a Cluster: The Singapore Biomedical Sciences Initiative." Harvard Business School Case 718-428, April 2018. (Revised September 2019.)
      • Article

      The Effects of Product Line Breadth: Evidence from the Automotive Industry

      By: Antonio Moreno and Christian Terwiesch
      Using a detailed data set from the U.S. automotive industry, we enrich the existing literature on product line breadth with new results that highlight previously unexplored operational aspects of its benefits and costs. We find that expanding product line breadth has a... View Details
      Keywords: Variety; Pricing; Automotive Industry; Marketing/operations Interface; Platforms; Empirical Operations Management; Product Marketing; Production; Management; Auto Industry
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      Moreno, Antonio, and Christian Terwiesch. "The Effects of Product Line Breadth: Evidence from the Automotive Industry." Marketing Science 36, no. 2 (March–April 2017): 254–271.
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