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  • August 2011 (Revised July 2012)
  • Case

Mike Mayo Takes on Citigroup (A)

By: Suraj Srinivasan and Amy Kaser
The case details the conflict between Mike Mayo, an influential banking analyst and Citigroup about what Mayo considers aggressive accounting policies. Mike Mayo questions Citigroup's lack of a valuation allowance against their Deferred Tax Assets despite Citi's recent... View Details
Keywords: Accounting; Taxation; Capital; Financial Reporting; Corporate Disclosure; Valuation; Banks and Banking; Financial Strategy; Money; Conflict Management; Capital Budgeting; Asset Management; Banking Industry
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Srinivasan, Suraj, and Amy Kaser. "Mike Mayo Takes on Citigroup (A)." Harvard Business School Case 112-025, August 2011. (Revised July 2012.)
  • 07 Apr 2014
  • Research & Ideas

Excerpt: ‘The Art of Negotiation’

things as well. Familiar routines and old assumptions have to be disrupted, even though doing so entails risk. Otherwise nothing new can be created. Frank Barrett calls this trait "provocative competence." It tops his list of key... View Details
Keywords: Re: Michael A. Wheeler
  • 01 Mar 2016
  • First Look

March 1, 2016

their demand for a risky asset by weighing two signals: an average of the asset’s past price changes and the asset’s degree of overvaluation. The two signals are in conflict, and investors “waver” over time in the relative weight they put on them. The View Details
Keywords: Sean Silverthorne
  • 2016
  • Working Paper

Diversified Business Groups in the West: History and Theory

By: Asli M. Colpan and Takashi Hikino
This working paper examines the historical origins, evolutionary paths, and long-term resilience of diversified business groups in contemporary developed economies of Western Europe, North America, and Oceania. It aims to come up with a new theoretical understanding of... View Details
Keywords: History; Diversification; Business Divisions; Theory; Oceania; North America; Europe
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Colpan, Asli M., and Takashi Hikino. "Diversified Business Groups in the West: History and Theory." Harvard Business School Working Paper, No. 17-035, October 2016.
  • 2016
  • Book

Revolutionizing Innovation: Users, Communities, and Open Innovation

By: Dietmar Harhoff and Karim R. Lakhani
The last two decades have witnessed an extraordinary growth of new models of managing and organizing the innovation process, which emphasize users over producers. Large parts of the knowledge economy now routinely rely on users, communities, and open innovation... View Details
Keywords: Innovation and Management; Transformation; Collaborative Innovation and Invention
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Harhoff, Dietmar and Karim R. Lakhani, eds. Revolutionizing Innovation: Users, Communities, and Open Innovation. Cambridge, MA: MIT Press, 2016.
  • March 2010 (Revised April 2014)
  • Case

American Well: The Doctor Will E-See You Now

By: Elie Ofek and Ron Laufer
What is next for healthcare IT provider American Well, whose innovative Online Care technology allows physicians to deliver care to patients online in real time? Using American Well's platform, patients with non-emergency health concerns can communicate with physicians... View Details
Keywords: Entrepreneurship; Health Care and Treatment; Technological Innovation; Growth and Development Strategy; Market Entry and Exit; Service Delivery; Online Technology; Health Industry
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Ofek, Elie, and Ron Laufer. "American Well: The Doctor Will E-See You Now." Harvard Business School Case 510-061, March 2010. (Revised April 2014.)
  • January 2020 (Revised December 2024)
  • Case

Governing PG&E

By: Lynn S. Paine and Will Hurwitz
The five commissioners of the California Public Utilities Commission (CPUC) listened intently at a public forum in April 2019 as PG&E Corporation’s out-going chairman Richard Kelly described the company’s proposed new board. PG&E, which provided electricity and natural... View Details
Keywords: Bankruptcy; Board Of Directors; Board Dynamics; Business Ethics; Business Model Innovation; Corporate Boards; Energy Efficiency; Environmental And Social Sustainability; Government And Business; Hedge Funds; Institutional Investors; Legal Aspects Of Business; Regulated Monopolies; Regulation; Shareholders; Stakeholder Management; Strategy And Execution; Utilities; Insolvency and Bankruptcy; Governing and Advisory Boards; Ethics; Capital Structure; Climate Change; Corporate Accountability; Corporate Governance; Environmental Sustainability; Executive Compensation; Leadership; Management; Safety; Business and Government Relations; Energy Industry; Utilities Industry; California; United States
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Paine, Lynn S., and Will Hurwitz. "Governing PG&E." Harvard Business School Case 320-024, January 2020. (Revised December 2024.)
  • July 2023 (Revised February 2024)
  • Case

Clair

By: Lauren Cohen, Grace Headinger and Marcos Quirno
Clair was founded with a simple mission: to expedite America’s workers access to their hard-earned wages. In the headwinds of the COVID-19 pandemic, the startup had successfully raised a seed round of $4.5 million, and within two years the earned wage access (EWA)... View Details
Keywords: Fintech; Ewa; Lending; Technology; Business Startups; Growth and Development Strategy; Social Enterprise; Business Strategy; Business Model; Mission and Purpose; Venture Capital; Profit; Financial Services Industry; United States
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Cohen, Lauren, Grace Headinger, and Marcos Quirno. "Clair." Harvard Business School Case 224-015, July 2023. (Revised February 2024.)
  • 04 Aug 2011
  • Working Paper Summaries

A Dynamic Perspective on Ambidexterity: Structural Differentiation and Boundary Activities

Keywords: by Sebastian Raisch & Michael L. Tushman
  • April 2022 (Revised May 2022)
  • Case

Mastercard Labs (A) (Abridged)

By: Linda A. Hill, Sunil Gupta, Emily Tedards and Julia Kelley
When Ajaypal (Ajay) Banga became the CEO of Mastercard in 2010, he shifted the company’s competitive focus from card networks to cash itself. Mastercard’s new vision of a “World Beyond Cash” distilled into a three-pronged framework: Grow the core business, Diversify... View Details
Keywords: Organizational Behavior; Culture; Organizational Culture; Culture Change; Organizational Adaptation; Organizational Effectiveness; Alignment; Leadership; Leadership Development; Innovation; Innovation Ecosystems; Diversity; Collaboration; Co-creation; Learning Organizations; Empowerment; Ecosystem; Agility; Prototype; Experiment; Partnerships; Operating Model; Risk Management; Metrics; Payments; Financial Inclusion; Financial Industry; Ambidexterity; Corporate Innovation; Innovation Lab; Accelerator; Start-up; Intrapreneurship; Competitive Strategy; Business Model; Technological Innovation; Growth and Development Strategy; Digital Transformation
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Hill, Linda A., Sunil Gupta, Emily Tedards, and Julia Kelley. "Mastercard Labs (A) (Abridged)." Harvard Business School Case 422-082, April 2022. (Revised May 2022.)
  • 29 Jan 2024
  • Research & Ideas

Do Disasters Rally Support for Climate Action? It's Complicated.

Environmental disasters like wildfires can ignite awareness of climate change and boost eco-friendly politicians’ careers. But do voters perceive a tradeoff between environmental policies and local economic growth? In Brazil, home to a majority of the Amazon tropical... View Details
Keywords: by Rachel Layne
  • 21 Oct 2005
  • Other Presentation

In Search of a Competitive Identity: Towards A Competitiveness Agenda for Colombia

By: Michael E. Porter
This presentation draws on ideas from Professor Porter's articles and books, in particular, The Competitive Advantage of Nations (The Free Press, 1990), "The Microeconomic Foundations of Economic Development," in The Global Competitiveness Report 2005-06, (World... View Details
Keywords: Economics; Colombia
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Porter, Michael E. "In Search of a Competitive Identity: Towards A Competitiveness Agenda for Colombia." Institute for Strategy and Competitiveness, Cartagena, Columbia, October 21, 2005.
  • 29 Jun 2005
  • Other Presentation

Chile’s Competitiveness: Where Does the Country Stand?

By: Michael E. Porter
This presentation draws on ideas from Professor Porter's articles and books, in particular, The Competitive Advantage of Nations (The Free Press, 1990), "The Microeconomic Foundations of Economic Development," in The Global Competitiveness Report 2004, (World Economic... View Details
Keywords: Economics; Chile
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Porter, Michael E. "Chile’s Competitiveness: Where Does the Country Stand?" Institute for Strategy and Competitiveness, Santiago, Chile, June 29, 2005.
  • 20 Sep 2016
  • News

TPP Passage a No Brainer for an Open Economy

  • May 2025
  • Case

The Future of the BBC: Public Ownership vs. Privatization

By: Henry McGee
With viewership of the British Broadcasting Company (BBC) in decline, the country’s Culture Minister must recommend a new funding model for the venerated public institution which will allow the broadcaster to succeed in an increasingly competitive media environment. View Details
Keywords: Television Entertainment; Cooperative Ownership; State Ownership; Privatization; Public Ownership; Media and Broadcasting Industry; United Kingdom
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McGee, Henry. "The Future of the BBC: Public Ownership vs. Privatization." Harvard Business School Case 825-086, May 2025.
  • June 2018
  • Supplement

Amil and the Health Care System in Brazil (B)

By: Regina Herzlinger, Ana Maria Malik, Ruth Costas and Priscilla Zogbi
Brazilian Managed Care Organization Amil faces a series of challenges while trying to redefine the terms of its relationship with hospitals and clinics and to implement a new health care model based on primary care and family medicine. View Details
Keywords: Health Care; Brazil; Managed Care; Innovation; Health Care Industry; Health Care and Treatment; Health; Cost Management; Innovation and Invention; Competitive Strategy; Health Industry; Insurance Industry; Brazil
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Herzlinger, Regina, Ana Maria Malik, Ruth Costas, and Priscilla Zogbi. "Amil and the Health Care System in Brazil (B)." Harvard Business School Supplement 318-149, June 2018.
  • 02 Jun 2020
  • Working Paper Summaries

HBS COVID-19 Global Policy Tracker

Keywords: by Alberto Cavallo and Tannya Cai; Health
  • 22 Mar 2024
  • Research & Ideas

Open Source Software: The $9 Trillion Resource Companies Take for Granted

What does it take to put a price tag on open source software (OSS), a resource so critical to the global economy that some 96 percent of commercial programs include some code created, tinkered with, or distributed for free by public-facing tech forums? A View Details
Keywords: by Rachel Layne; Computer; Information Technology; Technology

    Krishna G. Palepu

    KRISHNA G. PALEPU is the Ross Graham Walker Professor of Business Administration, and has served previously as Senior Advisor to the President of Harvard University, and Senior Associate Dean at the... View Details

    Keywords: accounting industry; banking; financial services; information technology industry; pharmaceuticals; retailing

      Ruru Hoong

      Ruru Hoong is a PhD candidate in Economics at Harvard & HBS, on the academic job market AY 2025-26.

      Her research interests span artificial intelligence, digital economics, privacy, and social media, primarily focusing on the (i) optimal design and integration... View Details

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