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      • Faculty Publications  (38)

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      • January 2025 (Revised April 2025)
      • Case

      Duolingo: On a 'Streak'

      By: Jeffrey F. Rayport, Nicole Tempest Keller and Nicole Luo
      In December 2024, Severin Hacker, Co-Founder and Chief Technology Officer of Duolingo, reflected on the remarkable evolution of the language-learning app he helped launch in 2011. As the #1 most downloaded education app in the world, Duolingo had over 100 million... View Details
      Keywords: Learning; AI and Machine Learning; Growth and Development Strategy; Motivation and Incentives; Diversification; Business Model; Market Entry and Exit; Technology Industry; Education Industry; United States
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      Rayport, Jeffrey F., Nicole Tempest Keller, and Nicole Luo. "Duolingo: On a 'Streak'." Harvard Business School Case 825-097, January 2025. (Revised April 2025.)
      • 2024
      • Working Paper

      What Makes Players Pay? An Empirical Investigation of In-Game Lotteries

      By: Tomomichi Amano and Andrey Simonov
      In 2020, gamers spent more than $15 billion on loot boxes, lotteries of virtual items in video games. Paid loot boxes are contentious. Game producers argue that loot boxes complement the gameplay and expenditures on loot boxes reflect players’ enjoyment of the game.... View Details
      Keywords: Consumer Behavior; Policy; Games, Gaming, and Gambling; Product Design; Ethics; Governing Rules, Regulations, and Reforms; Video Game Industry
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      Amano, Tomomichi, and Andrey Simonov. "What Makes Players Pay? An Empirical Investigation of In-Game Lotteries." Columbia Business School Research Paper Series, No. 4355019, June 2024.
      • March 2024
      • Supplement

      ELCA's Series A Cap Table Exercise (Instructor Version)

      By: Raymond Kluender and Anke Becker
      In ELCA, the company must decide between two term sheets: one put forth by STV and one put forth by ESV.

      This exercise is an analysis of the implications of these two term sheets on the ownership structure and the payouts of common and preferred... View Details
      Keywords: Analysis; Venture Capital; Investment; Ownership Stake
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      Kluender, Raymond, and Anke Becker. "ELCA's Series A Cap Table Exercise (Instructor Version)." Harvard Business School Spreadsheet Supplement 824-712, March 2024.
      • March 2024
      • Supplement

      ELCA's Series A Cap Table Exercise (Student Version)

      By: Raymond Kluender, Anke Becker and Johnson Elugbadebo
      In ELCA, the company must decide between two term sheets: one put forth by STV and one put forth by ESV.

      This exercise is an analysis of the implications of these two term sheets on the ownership structure and the payouts of common and preferred... View Details
      Keywords: Analysis; Venture Capital; Investment; Ownership Stake
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      Kluender, Raymond, Anke Becker, and Johnson Elugbadebo. "ELCA's Series A Cap Table Exercise (Student Version)." Harvard Business School Spreadsheet Supplement 824-713, March 2024.
      • November 2023
      • Case

      Apple Inc. in 2023

      By: David B. Yoffie and Sarah von Bargen
      Under CEO Tim Cook, Apple became the first trillion dollar market cap company, the first two trillion dollar company, and the first three trillion dollar company. Since the COVID pandemic, Apple gained over 20% of the world smartphone market and 50% of the U.S. market,... View Details
      Keywords: Competitive Advantage; Product Positioning; Emerging Markets; Competitive Strategy; Technological Innovation; Revenue; Technology Industry
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      Yoffie, David B., and Sarah von Bargen. "Apple Inc. in 2023." Harvard Business School Case 724-419, November 2023.
      • December 2022
      • Technical Note

      Risks and Opportunities from the Transition to a Low Carbon Economy: A Business Analysis Framework

      By: George Serafeim
      The transition to a low carbon economy introduces many risks and opportunities for businesses. Risks emerge from regulatory actions, such as carbon taxes and cap and trade systems, technological innovation that develop alternatives for customers making existing... View Details
      Keywords: Risk Assessment; Opportunities; Environmental Sustainability; Carbon Footprint; Risk Management; Competitive Dynamics; Business Analysis; Climate Change; Accounting; Finance; Valuation; Business and Shareholder Relations; Technological Innovation; Transition; Product Positioning; Renewable Energy; Analysis
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      Serafeim, George. "Risks and Opportunities from the Transition to a Low Carbon Economy: A Business Analysis Framework." Harvard Business School Technical Note 123-014, December 2022.
      • November 2022 (Revised March 2023)
      • Case

      OneSmart

      By: Nien-he Hsieh, Meg Rithmire and Shu Lin
      At the end of 2021, Xi “Steve” Zhang was facing an existential crisis for himself and his business. OneSmart was a premium educational company founded in 2008 offering K-12 afterschool tutoring for students nationwide under a number of brands. The company was founded... View Details
      Keywords: Governing Rules, Regulations, and Reforms; Crisis Management; Failure; Education Industry; China
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      Hsieh, Nien-he, Meg Rithmire, and Shu Lin. "OneSmart." Harvard Business School Case 723-017, November 2022. (Revised March 2023.)
      • March 31, 2022
      • Article

      Two Approaches to Capping Health Care Prices

      By: Michael E. Chernew, Maximilian J. Pany and Leemore S. Dafny
      High health care prices for the privately-insured contribute to high premiums, which put downward pressure on wages, and induce employers to reduce benefit generosity and charge employees more for coverage. As the average annual premium for family coverage currently... View Details
      Keywords: Price Caps; Health Care and Treatment; Price
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      Chernew, Michael E., Maximilian J. Pany, and Leemore S. Dafny. "Two Approaches to Capping Health Care Prices." Health Affairs Forefront (March 31, 2022).
      • March 2022 (Revised July 2022)
      • Teaching Note

      Camera IQ and the Metaverse: Building Augmented Reality Brand Experiences

      By: Jill Avery
      Camera IQ, a camera marketing software company that empowered brands to create and launch augmented reality experiences (AREs) across social platforms, had just raised an additional $5 million to fund further product development and expand its marketing and sales... View Details
      Keywords: Brand Management; Virtual Reality; Augmented Reality; B2B; E-commerce; Technology Platform; Marketing; Marketing Communications; Marketing Strategy; Brands and Branding; Digital Marketing; Internet and the Web; Growth Management; Customer Relationship Management; Customer Value and Value Chain; Social Media; Applications and Software; Digital Platforms; Advertising Industry; United States
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      Avery, Jill. "Camera IQ and the Metaverse: Building Augmented Reality Brand Experiences." Harvard Business School Teaching Note 522-065, March 2022. (Revised July 2022.)
      • March 2022 (Revised October 2022)
      • Case

      Transforming Kimball International, Inc. (A)

      By: Lynn S. Paine and Will Hurwitz
      Kimball International, Inc. (KII), led by CEO Kristie Juster, and its board of directors, chaired by Kim Ryan, faced critical questions about KII’s future in the spring of 2021. Two years earlier, the board had appointed Juster as the new CEO of KII, a publicly traded,... View Details
      Keywords: Board Of Directors; Board Committees; Board Decisions; Board Dynamics; CEO Compensation; CEO Succession; Compensation Committee; Compensation Consultants; Compensation Design; Compensation Mix; Corporate Purpose; COVID-19; ESG; Furniture; Furniture Industry; Manufacturing; Midwest; Pandemic; Purpose; Spin Off; Strategic Change; Strategic Decisions; Strategic Evolution; Target-setting; Executive Compensation; Family Ownership; Governance; Restructuring; Strategy; Transformation; Manufacturing Industry; United States
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      Paine, Lynn S., and Will Hurwitz. "Transforming Kimball International, Inc. (A)." Harvard Business School Case 322-083, March 2022. (Revised October 2022.)
      • February 2022
      • Article

      Sugar-sweetened Beverage Purchases and Intake at Event Arenas with and without a Portion Size Cap

      By: Sheri Volger, James Scott Parrott, Brian Elbel, Leslie K. John, Jason P. Block, Pamela Rothpletz-Puglia and Christina A. Roberto
      This is the first real-world study to examine the association between a voluntary 16-ounce (oz.) portion-size cap on sugar-sweetened beverages (SSB) at a sporting arena on volume of SSBs and food calories purchased and consumed during basketball games. Cross-sectional... View Details
      Keywords: Sugar-sweetened Beverages; Nutrition Policy; Obesity Prevention; Portion Sizes; Nutrition; Policy; Health; Behavior
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      Volger, Sheri, James Scott Parrott, Brian Elbel, Leslie K. John, Jason P. Block, Pamela Rothpletz-Puglia, and Christina A. Roberto. "Sugar-sweetened Beverage Purchases and Intake at Event Arenas with and without a Portion Size Cap." Art. 101661. Preventative Medicine Reports 25 (February 2022).
      • Winter 2021
      • Article

      Mobile Internet Usage and Usage-based Pricing

      By: Jeffrey Prince and Shane Greenstein
      Using data on mobile Internet usage of thousands of individuals, we provide some of the first analyses linking mobile usage to key demographics such as income. We find a reverse-U relationship between mobile Internet usage and income—notably different than the... View Details
      Keywords: Mobile Internet Usage; Pricing Strategy; Internet and the Web; Mobile and Wireless Technology; Demographics; Income; Price; Strategy
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      Prince, Jeffrey, and Shane Greenstein. "Mobile Internet Usage and Usage-based Pricing." Journal of Economics & Management Strategy 30, no. 4 (Winter 2021): 760–783.
      • September 2021 (Revised October 2021)
      • Case

      Tesla's Uncertain Fate as EV Race Accelerates

      By: David Collis and Haisley Wert
      By September 2021, Tesla had a staggering market cap of $755 billion. As the leader of the automobile industry, Tesla’s worth surpassed that of the six largest runner-ups combined, including Toyota, Volkswagen, BYD, Daimler, Great Wall Motors, and General Motors. As... View Details
      Keywords: Electric Vehicles; Strategy; Corporate Strategy; Valuation; Competitive Advantage; Value Creation; Auto Industry
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      Collis, David, and Haisley Wert. "Tesla's Uncertain Fate as EV Race Accelerates." Harvard Business School Case 722-368, September 2021. (Revised October 2021.)
      • August 2021 (Revised March 2022)
      • Case

      Camera IQ and the Metaverse: Building Augmented Reality Brand Experiences

      By: Jill Avery and Rayan Nahas
      Camera IQ, a camera marketing software company that empowered brands to create and launch augmented reality experiences (AREs) across social platforms, had just raised an additional $5 million to fund further product development and expand its marketing and sales... View Details
      Keywords: Brand Management; Virtual Reality; Augmented Reality; B2B; Technology Platform; Marketing; Marketing Communications; Marketing Strategy; Brands and Branding; Digital Marketing; Internet and the Web; Growth Management; Customer Relationship Management; Customer Value and Value Chain; Social Media; E-commerce; Applications and Software; Digital Platforms; Advertising Industry; United States
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      Avery, Jill, and Rayan Nahas. "Camera IQ and the Metaverse: Building Augmented Reality Brand Experiences." Harvard Business School Case 522-002, August 2021. (Revised March 2022.)
      • 2021
      • Book

      The Power of Trust: How Companies Build It, Lose It, Regain It

      By: Sandra J. Sucher and Shalene Gupta
      Trust is the most powerful force underlying the success of every business. Yet it can be shattered in an instant, with a devastating impact on a company’s market cap and reputation. How to build and sustain trust requires fresh insight into why customers, employees,... View Details
      Keywords: Power; Corporate Culture; Future Of Work; Innovation; Technology Strategy; Automation; Stakeholder Engagement; Employee Attitude; Customer Behavior; Shareholder Value; Government And Business; Impact Investing; Corporate Change And Sustainability; Trust; Power and Influence; Globalization; Leadership; Organizational Culture; Innovation and Invention; Human Resources; Information Technology; Strategy; Corporate Accountability; Asia; Europe; South America; Middle East; North and Central America
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      Sucher, Sandra J., and Shalene Gupta. The Power of Trust: How Companies Build It, Lose It, Regain It. New York: PublicAffairs, 2021.
      • May 2018
      • Article

      Linda Babcock: Go-getter and Do-gooder

      By: Max Bazerman, Iris Bohnet, Hannah Riley-Bowles and George Loewenstein
      In this tribute to the 2007 recipient of the Jeffrey Z. Rubin Theory‐To‐Practice Award from the International Association for Conflict Management (IACM), we celebrate Linda Babcock's contributions to diverse lines of research, her tireless and effective efforts to put... View Details
      Keywords: Personal Development and Career; Biography; Research; Negotiation; Leadership; Practice
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      Bazerman, Max, Iris Bohnet, Hannah Riley-Bowles, and George Loewenstein. "Linda Babcock: Go-getter and Do-gooder." Negotiation and Conflict Management Research 11, no. 2 (May 2018): 130–145.
      • March 2018
      • Technical Note

      Internet Data Capping Note (B)

      By: Shane Greenstein and Christine Snively
      The B note brings the reader up through early 2017 and addresses an informal review carried out by the Wireless Telecommunications Bureau (WTB) on sponsored data and zero-rating data plans in the mobile broadband market. View Details
      Keywords: Telecommunications; Information Technology; Internet and the Web
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      Greenstein, Shane, and Christine Snively. "Internet Data Capping Note (B)." Harvard Business School Technical Note 618-061, March 2018.
      • Article

      How Did the Great Recession Affect Charitable Giving?

      By: Arthur C. Brooks
      A great deal of research has studied the effects of income and tax changes on charitable giving. However, little work has focused on how these relationships were affected by the Great Recession. This article estimates the tax and income effects using the 2009 Panel... View Details
      Keywords: Charitable Giving; Great Recession; Philanthropy; Philanthropy and Charitable Giving; Financial Crisis; Taxation; Policy
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      Brooks, Arthur C. "How Did the Great Recession Affect Charitable Giving?" Public Finance Review 46, no. 5 (September 2018): 715–742.
      • November 2016
      • Case

      ShotSpotter

      By: Mitchell Weiss and Sarah McAra
      SST, Inc. offered a subscription-based gunfire detection service, ShotSpotter Flex, to cities across the United States in addition to a few abroad. Over its 20-year history, SST had mostly honed a reliable business-to-government sales model, and the company had been... View Details
      Keywords: ShotSpotter; SST; Internet Of Things; IoT; Smart Cities; Public Entrepreneurship; Enterprise Sales; Scaling And Growth; Government; Public Sector; Innovation; Ralph Clark; Entrepreneurship; Sales; Innovation and Invention; Public Administration Industry; California; United States
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      Weiss, Mitchell, and Sarah McAra. "ShotSpotter." Harvard Business School Case 817-034, November 2016.
      • September 2016 (Revised October 2016)
      • Technical Note

      Internet Data Capping Note

      By: Shane Greenstein, Lisa Cox and Christine Snively
      In April 2016, U.S. federal regulators approved Charter Communications’ acquisition of Time Warner Cable (TWC). The Department of Justice (DoJ) and Federal Communications Commission (FCC), however, stipulated that the new company could not apply data caps or introduce... View Details
      Keywords: Internet Service Provider; Data Caps; Compression; Information Technology; Internet and the Web; United States
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      Greenstein, Shane, Lisa Cox, and Christine Snively. "Internet Data Capping Note." Harvard Business School Technical Note 617-003, September 2016. (Revised October 2016.)
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