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- 2003
- Class Lecture
Judo Strategy
By: David B. Yoffie
Keywords: Strategy
Yoffie, David B. "Judo Strategy." Boston: Harvard Business School Publishing Class Lecture, 2003. Electronic. (Faculty Lecture: HBSP Product Number 1512C.)
- 2001
- Book
Judo Strategy
By: D. B. Yoffie and Mary Kwak
Keywords: Competitive Strategy
Yoffie, D. B., and Mary Kwak. Judo Strategy. Boston, MA: Harvard Business School Press, 2001.
- 04 Jun 2001
- Research & Ideas
RealNetworks, CNET, and Judo Strategy
Ziff-Davis and is now the ninth largest network on the Internet. The tales of these two firms (along with that of Donna Dubinsky, a member of the HBS Class of 1981 and CEO of Handspring, the maker of Visor personal organizers) are the subject of Masters of View Details
Keywords: by Jim Aisner
- January 1994 (Revised April 1995)
- Case
Judo Economics
The early 1990s saw a new wave of start-ups in the U.S. airline business. One entrant, Kiwi International Air Lines, took to the skies in September 1992 with a strategy of attracting small-business travelers looking to save money but lacking the flexibility to book in... View Details
Keywords: Market Entry and Exit; Competitive Advantage; Business Startups; Air Transportation Industry; Financial Services Industry
Brandenburger, Adam M., and Julia Kou. "Judo Economics." Harvard Business School Case 794-103, January 1994. (Revised April 1995.)
- June 2003
- Case
Judo in Action
Contains four short stories about small firms challenging large firms. Illustrates some of the ideas that have been termed "judo strategy." In each case, one can argue that the small firm attempts to use the large firm's size and incumbency to constrain the large firm... View Details
Corts, Kenneth S., and Deborah Freier. "Judo in Action." Harvard Business School Case 703-454, June 2003.
- 16 Jul 2001
- Research & Ideas
How to Compete Like a Judo Strategist
Several best practices, as explained by past and current masters of judo strategy, can help you reach the top of your game. While there are no substitutes for mastering the concepts of judo View Details
Keywords: by David B. Yoffie & Mary Kwak
- March 2014 (Revised March 2018)
- Case
Red Bull (A)
By: Eric Van den Steen and Carin-Isabel Knoop
Despite facing giants like Coke, Pepsi, and Budweiser—with obvious potential sources of competitive advantage—Red Bull had established itself as the U.S. market leader in energy drinks. By 2008, however, Red Bull's dominance was challenged as Monster drinks surpassed... View Details
Keywords: Judo Strategy; Judo Economics; Sustainable Competitive Advantage; Imitation; Strategy; Competitive Strategy; Competitive Advantage; Market Entry and Exit; Food and Beverage Industry; United States
Van den Steen, Eric, and Carin-Isabel Knoop. "Red Bull (A)." Harvard Business School Case 714-401, March 2014. (Revised March 2018.)
- January–February 1999
- Article
Judo Strategy: The Competitive Dynamics of Internet Time
By: D. B. Yoffie and M. A. Cusumano
Yoffie, D. B., and M. A. Cusumano. "Judo Strategy: The Competitive Dynamics of Internet Time." Harvard Business Review 77, no. 1 (January–February 1999): 70–81.
- Article
Judo Strategy: 10 Techniques for Beating a Stronger Opponent
By: David Yoffie and Mary Kwak
Keywords: Strategy
Yoffie, David, and Mary Kwak. "Judo Strategy: 10 Techniques for Beating a Stronger Opponent." Business Strategy Review 13, no. 1 (Spring 2002): 20–30.
- 17 Jul 2006
- Lessons from the Classroom
Developing a Strategy for Digital Convergence
and Doris Starr Professor of International Business Administration at Harvard Business School and an expert in technology strategy. So when Yoffie began a three-year effort to update an HBS elective course on strategy development in... View Details
- 20 Apr 2015
- Research & Ideas
The 5 Strategy Rules of Bill Gates, Andy Grove, and Steve Jobs
that no one had ever seen and that no one understood what it did was brilliant” Those are the questions David B. Yoffie and Michael A. Cusumano address in their new book, Strategy Rules: Five Timeless Lessons from Bill Gates, Andy Grove,... View Details
- 12 Oct 1999
- Research & Ideas
Throwing Your Opponent: Strategies for the Internet Age
can use judo strategy to threaten an entrenched giant such as Microsoft, Microsoft's eventual success in the Internet "browser wars" shows that large, established companies can use these precepts effectively... View Details
Keywords: by Daniel Penrice
- July 2013
- Technical Note
Competition Simulator Exercise: Questions
In the Competition Simulator Exercise, students explore through trial and error some important economic foundations of competitive strategy and managerial economics. In particular, the simulator lets students explore horizontal differentiation with and without price... View Details
Keywords: Economics Of Strategy; Economics Of Competition; Competition; Economics; Game Theory; Competitive Strategy; Marketing Strategy
Van den Steen, Eric. "Competition Simulator Exercise: Questions." Harvard Business School Technical Note 714-406, July 2013.
- February 2019 (Revised September 2021)
- Case
The a2 Milk Company
By: Benjamin C. Esty and Daniel Fisher
The a2 Milk Company (a2MC) became the most valuable company listed on the New Zealand stock exchange in 2018 by capitalizing on a biochemical discovery related to the protein composition of cow's milk. Because many people find the A1 protein difficult to digest, and... View Details
Keywords: Judo Economics; Market Entry; Innovation; Barriers To Response; Industry Attractiveness; Advantage Horizon; Sustainability; First-mover Advantage; Scope; Strategy Execution; Strategic Evolution; Biochemistry; Genetics; Branding; Commodity; Milk; Dairy; Infant Formula; Farming; Porter's Five Forces; Competitive Advantage; Corporate Strategy; Value Creation; Competition; Disruption; Innovation and Invention; Five Forces Framework; Market Entry and Exit
Esty, Benjamin C., and Daniel Fisher. "The a2 Milk Company." Harvard Business School Case 719-424, February 2019. (Revised September 2021.)
- January 2019 (Revised February 2019)
- Supplement
The a2 Milk Company
By: Benjamin C. Esty, Daniel Fisher and Greg Saldutte
The a2 Milk Company (a2MC) became the most valuable company listed on the New Zealand stock exchange in 2018 by capitalizing on a biochemical discovery related to the protein composition of cow's milk. Because many people find the A1 protein difficult to digest, and... View Details
Keywords: Judo Economics; Market Entry; Innovation; Barriers To Response; Industry Attractiveness; Advantage Horizon; Sustainability; First-mover Advantage; Scope; Strategy Execution; Strategic Evolution; Biochemistry; Genetics; Branding; Commodity; Milk; Dairy; Infant Formula; Farming; Porter's Five Forces; Competitive Advantage; Corporate Strategy; Value Creation; Competition; Market Entry and Exit; Disruption; Innovation and Invention; Five Forces Framework; Consumer Products Industry; New Zealand; Australia; China
- April 2019
- Teaching Note
The a2 Milk Company
By: Benjamin C. Esty and Daniel Fisher
The a2 Milk Company (a2MC) became the most valuable company listed on the New Zealand stock exchange in 2018 by capitalizing on a biochemical discovery related to the protein composition of cow's milk. Because many people find the A1 protein difficult to digest, and... View Details
Keywords: Judo Economics; Market Entry; Innovation; Barriers To Response; Industry Attractiveness; Advantage Horizon; Sustainability; First-mover Advantage; Scope; Strategy Execution; Strategic Evolution; Biochemistry; Genetics; Branding; Commodity; Milk; Dairy; Infant Formula; Farming; Porter's Five Forces; Market Entry and Exit; Disruption; Innovation and Invention; Competitive Advantage; Corporate Strategy; Value Creation; Competition; Brands and Branding; Five Forces Framework; Consumer Products Industry; New Zealand; Australia; China
- June 2023 (Revised November 2024)
- Case
Collaboration Wars: Slack vs. Microsoft Teams 2023
By: David B. Yoffie, Kriti Gupta, Mehek Punatar, Poonam Sacheti and Poorvi Vijay
What's the future of corporate communications? Email? Corporate messaging? The battle for corporate messaging in 2023 was stacking up as a fight between Slack, which had been recently acquired by Salesforce, and Microsoft Teams. This case explores a classic judo... View Details
Keywords: Competition; Product Positioning; Marketing Strategy; Acquisition; Technology Industry; Communications Industry
Yoffie, David B., Kriti Gupta, Mehek Punatar, Poonam Sacheti, and Poorvi Vijay. "Collaboration Wars: Slack vs. Microsoft Teams 2023." Harvard Business School Case 723-457, June 2023. (Revised November 2024.)
- June 2012 (Revised July 2013)
- Exercise
Competition Simulator Exercise: Instructions
In the Competition Simulator Exercise, students explore through trial and error some important economic foundations of competitive strategy and managerial economics. In particular, the nine simulator exercises let students explore horizontal differentiation with and... View Details
Van den Steen, Eric. "Competition Simulator Exercise: Instructions." Harvard Business School Exercise 712-498, June 2012. (Revised July 2013.)
- June 2013 (Revised November 2022)
- Exercise
Competition Simulator Exercise
In the Competition Simulator Exercise, students explore through trial and error some important economic foundations of competitive strategy and managerial economics. In particular, the nine simulator exercises let students explore horizontal differentiation with and... View Details
Keywords: Competition; Economics; Game Theory; Competitive Strategy; Learning; Mathematical Methods; Analysis
Van den Steen, Eric J. "Competition Simulator Exercise." Harvard Business School Exercise 713-804, June 2013. (Revised November 2022.)
- 03 Dec 2001
- What Do You Think?
What Happens When the Sumo Master Learns Judo?
does not trust Microsoft and its use of 'customer' information to market to customers and hold them digitally captive. This demographic will continue to provide sales to (a judo master competitor)." These comments reflect general... View Details
Keywords: by James Heskett