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- March 2025 (Revised April 2025)
- Case
Perplexity: Redefining Search
By: Suraj Srinivasan, Michelle Hu, Sriraghav Srinivasan and Radhika Kak
By early 2025, Perplexity had rapidly evolved from a modest startup into a popular "answer engine" valued at $9 billion. The company had boldly positioned itself as the disruptor to Google aiming to redefine search for the AI age. Through novel AI... View Details
- 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
- January 2025
- Technical Note
Get Cool: Air Conditioning Industry Background
By: Rosabeth Moss Kanter and Jacob A. Small
The “air conditioning paradox” is tied to climate change: the more the planet warms, the greater the need for cooling (due to the dangers of extreme heat as well as comfort within buildings), but the use of electricity-powered AC contributes to further warming. There... View Details
- January–February 2025
- Article
Want Your Company to Get Better at Experimentation?: Learn Fast by Democratizing Testing
By: Iavor Bojinov, David Holtz, Ramesh Johari, Sven Schmit and Martin Tingley
For years, online experimentation has fueled the innovations of leading tech companies, enabling them to rapidly test and refine new ideas, optimize product features, personalize user experiences, and maintain a competitive edge. The widespread availability and lower... View Details
- October 2024
- Article
Sampling Bias in Entrepreneurial Experiments
By: Ruiqing Cao, Rembrand Koning and Ramana Nanda
Using data from a prominent online platform for launching new digital products, we document that ‘sampling bias’—defined as the difference between a startup’s target customer base and the actual sample on which early ‘beta tests’ are conducted—has a systematic and... View Details
- 2024
- Working Paper
Igniting Innovation: Evidence from PyTorch on Technology Control in Open Collaboration
By: Daniel Yue and Frank Nagle
Many companies offer free access to their technology to encourage outside addon
innovation, hoping to later profit by raising prices or harnessing the power of the crowd
while continuing to steer the direction of innovation. They can achieve this balance by
opening... View Details
- 2024
- Working Paper
AI Companions Reduce Loneliness
By: Julian De Freitas, Ahmet K. Uğuralp, Zeliha O. Uğuralp and Stefano Puntoni
Chatbots are now able to engage in sophisticated conversations with consumers in the domain of relationships, providing a potential coping solution to widescale societal loneliness. Behavioral research provides little insight into whether these applications are... View Details
- March 2024
- Teaching Note
CoPilot(s): Generative AI at Microsoft and GitHub
By: Frank Nagle and Maria P. Roche
This teaching note is the companion to case N9-624-010 CoPilot(s): Generative AI at Microsoft and GitHub, which takes place in late 2021. The case briefly describes the history of both GitHub and Microsoft with a particular focus on open source software (OSS)—software... View Details
- December 2023
- Case
TikTok: The Algorithm Will See You Now
By: Shikhar Ghosh and Shweta Bagai
In a world where attention is a scarce commodity, this case explores the meteoric rise of TikTok—an app that transformed from a niche platform for teens into the most visited domain by 2021—surpassing even Google. Its algorithm was a sophisticated mechanism for... View Details
- October 2023
- Teaching Note
Metaverse Wars
By: Andy Wu and Matt Higgins
Teaching Note for HBS Case No. 723-431. Metaverse Wars recaps the development of the metaverse concept and the attendant hype, bringing the narrative up to the summer of 2023 when Meta’s big pivot looked more like a costly misstep than a stroke of strategic genius. In... View Details
- July 13, 2023
- Article
Threads Foreshadows a Big—and Surprising—Shift in Social Media
By: Scott Duke Kominers and Liang Wu
Threads, Meta’s Twitter competitor, has become the fastest downloaded app in history. One of the reasons for this is because it allows users to port over their profiles and follows from the already popular social media platform Instagram, also owned by Meta—a feature... View Details
- February 2023
- Case
Roblox: Virtual Commerce in the Metaverse
By: Ayelet Israeli and Nicole Tempest Keller
In 2022, Roblox had 58.8 million daily active users, including over half of all children and teens under the age of 16 in the United States. Roblox, a free-to-use “co-experience platform”, allowed users to come together in immersive 3D experiences to socialize, work,... View Details
Keywords: Entertainment; Games, Gaming, and Gambling; Market Design; Marketing; Brands and Branding; Marketing Channels; Marketing Strategy; Business Strategy; Economics; Economy; Economic Systems; Advertising; Advertising Campaigns; Digital Platforms; Markets; Price; Innovation and Management; Entertainment and Recreation Industry; Video Game Industry; Technology Industry; United States; California; North America; South America; Asia; Europe
- January 2023
- Teaching Note
Duolingo: Teaching Languages to the Masses
By: Youngme Moon
Teaching Note for HBS Case 323-016. At the time the case is written, Duolingo is the most popular language learning service in the world. The company has more than 40 million monthly active users, and the company’s total annual revenue has reached $250 million a year.... View Details
- November 2022 (Revised June 2023)
- Case
UGG Steps into the Metaverse
By: Shunyuan Zhang, Sharon Joseph, Sunil Gupta and Julia Kelley
In the fall of 2022, boot maker UGG and its parent company, Deckers, were working to position the brand in the nascent but fast growing metaverse. The metaverse, the online realm that individual users could navigate as digital avatars, was becoming more commercialized,... View Details
- July 2022 (Revised February 2024)
- Teaching Note
The DivaCup: Navigating Distribution and Growth
By: Ayelet Israeli
Teaching Note for HBS Case No. 519-055. When the mother-daughter founders of DivaCup set out with a mission to disrupt the menstrual care industry with an innovative product form, they initially struggled to gain legitimacy and convince retailers to carry their unique... View Details
Keywords: Female; Female Ceo; Female Entrepreneur; Female Protagonist; Health ＆ Wellness; Healthcare; Price Policies; Minimum Advertised Price; Differentiation; Positioning; Growth; Health; Health Care and Treatment; Price; Disruption; Distribution; Distribution Channels; Competitive Strategy; Competition; Growth Management; Mission and Purpose; Product Development; Product Marketing; Product Launch; Product Positioning; Advertising; Business Startups; Internet and the Web; Entrepreneurship; Social Entrepreneurship; Social Issues; Social Enterprise; Retail Industry; Medical Devices and Supplies Industry; Manufacturing Industry; Health Industry; Green Technology Industry; Education Industry; Distribution Industry; Consumer Products Industry; Canada; United States; United Kingdom
- May 2022
- Case
Rawbank's Illico Cash: Can 'Fast Money' Overcome Cash Dependency in the DRC?
By: Lauren Cohen and Grace Headinger
Thomas de Dreux-Brézé, the Head of Strategy and Project Management at Rawbank Congo in the Democratic Republic of the Congo (DRC), was perplexed as he reviewed annual adoption rates for the bank’s launch of Illico Cash 2.0. As the bank’s mobile money app, Illico Cash... View Details
Keywords: Fintech; Inflation; Deflation; Rural; Urban; Emerging Market; Mobile Technology; Finance; Money; Inflation and Deflation; Business Growth and Maturation; Decision Choices and Conditions; Demographics; Developing Countries and Economies; Corporate Entrepreneurship; Behavioral Finance; Currency; Banks and Banking; Commercial Banking; Financial Strategy; Rural Scope; Urban Scope; Innovation Strategy; Emerging Markets; Network Effects; Consumer Behavior; Mobile and Wireless Technology; Technology Adoption; Banking Industry; Financial Services Industry; Technology Industry; Congo, Democratic Republic of the
- April 2022
- Case
NIO: A Chinese EV Company's Global Strategy
By: William C. Kirby, Shu Lin and Noah B. Truwit
Founded in November 2014 and based in Shanghai, NIO designed, jointly manufactured, and sold premium “smart” EVs. Its mission was to “shape a joyful lifestyle by offering high-performance smart electric vehicles and being the best user enterprise. At NIO Day 2021,... View Details
- Article
The Translucent Hand of Managed Ecosystems: Engaging Communities for Value Creation and Capture
By: Elizabeth J. Altman, Frank Nagle and Michael Tushman
Management research has increasingly explored the domains of ecosystems, platforms, and open/user/distributed innovation—governance structures focused on engaging with external communities. While these research areas include substantial empirical and theoretical work... View Details
- October 2021 (Revised February 2023)
- Case
Ant Group (A)
By: Krishna G. Palepu, Feng Zhu, Susie L. Ma and Kerry Herman
In 2004, Chinese e-commerce company Alibaba created Alipay, an app to facilitate payments on its e-commerce sites. As Alibaba grew, so did Alipay, until Alipay spawned its own ecosystem of financial technology products and services under the name of Ant Group. By 2020,... View Details
- September 2021 (Revised December 2023)
- Case
On the Bubble: Startup Bootstrapping
By: Jeffrey J. Bussgang, Tom Quinn and Annelena Lobb
Bubble was a software company in the low-code/no-code market, making tools that allowed users without traditional programming backgrounds or technical skills to build software. The case covers cofounder Joshua Haas’s engineering background, as he experienced a high... View Details
Keywords: Business Startups; Business Growth and Maturation; Business Model; Business Plan; Disruption; Transformation; Trends; Customer Focus and Relationships; Customer Relationship Management; Cost vs Benefits; Decisions; Entrepreneurship; Venture Capital; Equity; Executive Compensation; Recruitment; Selection and Staffing; Disruptive Innovation; Technological Innovation; Job Interviews; Growth and Development Strategy; Ownership Stake; Opportunities; Applications and Software; Technology Adoption; Technology Industry; Web Services Industry; New York (city, NY); California; France