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  • All HBS Web  (14,737)
    • People  (57)
    • News  (2,450)
    • Research  (9,837)
    • Events  (46)
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  • 2021
  • Working Paper

How Much Should We Trust Staggered Difference-In-Differences Estimates?

By: Andrew C. Baker, David F. Larcker and Charles C.Y. Wang
Difference-in-differences analysis with staggered treatment timing is frequently used to assess the impact of policy changes on corporate outcomes in academic research. However, recent advances in econometric theory show that such designs are likely to be biased in the... View Details
Keywords: Difference In Differences; Staggered Difference-in-differences Designs; Generalized Difference-in-differences; Dynamic Treatment Effects; Mathematical Methods
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Baker, Andrew C., David F. Larcker, and Charles C.Y. Wang. "How Much Should We Trust Staggered Difference-In-Differences Estimates?" European Corporate Governance Institute Finance Working Paper, No. 736/2021, February 2021. (Harvard Business School Working Paper, No. 21-112, April 2021.)
  • 2014
  • Working Paper

Search-Based Peer Firms: Aggregating Investor Perceptions Through Internet Co-Searches

By: Charles M.C. Lee, Paul Ma and Charles C.Y. Wang
Applying a "co-search" algorithm to Internet traffic at the SEC's EDGAR web-site, we develop a novel method for identifying economically-related peer firms and for measuring their relative importance. Our results show that firms appearing in chronologically adjacent... View Details
Keywords: Peer Firm; EDGAR Search Traffic; Revealed Preference; Co-search; Industry Classification; Analytics and Data Science; Internet and the Web; Mathematical Methods; Corporate Finance
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Lee, Charles M.C., Paul Ma, and Charles C.Y. Wang. "Search-Based Peer Firms: Aggregating Investor Perceptions Through Internet Co-Searches." Harvard Business School Working Paper, No. 13-048, November 2012. (Revised September 2013, March 2014, June 2014, July 2014.)
  • 2025
  • Working Paper

Dynamic Personalization with Multiple Customer Signals: Multi-Response State Representation in Reinforcement Learning

By: Liangzong Ma, Ta-Wei Huang, Eva Ascarza and Ayelet Israeli
Reinforcement learning (RL) offers potential for optimizing sequences of customer interactions by modeling the relationships between customer states, company actions, and long-term value. However, its practical implementation often faces significant challenges.... View Details
Keywords: Dynamic Policy; Deep Reinforcement Learning; Representation Learning; Dynamic Difficulty Adjustment; Latent Variable Models; Customer Relationship Management; Customer Value and Value Chain; Foreign Direct Investment; Analytics and Data Science
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Ma, Liangzong, Ta-Wei Huang, Eva Ascarza, and Ayelet Israeli. "Dynamic Personalization with Multiple Customer Signals: Multi-Response State Representation in Reinforcement Learning." Harvard Business School Working Paper, No. 25-037, February 2025.
  • Article

Private and Civil Society Governors of Mercury Pollution from Artisanal and Small-scale Gold Mining: A Network Analytic Approach

By: Kristin Sippl
Artisanal and small-scale gold mining (ASGM) is both a subsistence livelihood for millions of people and the leading source of mercury pollution globally. The United Nation’s 2013 Minamata Convention on Mercury aims to address this challenge, but such public regulatory... View Details
Keywords: Artisanal And Small-scale Mining (ASM); Private Governance; Gold; Mercury; Mining; Governance; Networks; Pollutants; Research
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Sippl, Kristin. "Private and Civil Society Governors of Mercury Pollution from Artisanal and Small-scale Gold Mining: A Network Analytic Approach." Extractive Industries and Society 2, no. 2 (April 2015): 198–208.
  • September 2011 (Revised December 2012)
  • Case

Pepsi-Lipton Brisk

By: Thales S. Teixeira and Alison Caverly
This case showcases key decisions in promoting the re-launch of Brisk, a ready-to-drink iced tea by Pepsi-Lipton. The decisions are: creative, media and metrics selection. It also deals with budget allocation to traditional (Super Bowl, television) and new (viral ads... View Details
Keywords: Marketing Channels; Marketing Communications; Advertising Campaigns; Decision Making; Media; Product Launch; Resource Allocation; Performance Effectiveness; Budgets and Budgeting; Food and Beverage Industry
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Teixeira, Thales S., and Alison Caverly. "Pepsi-Lipton Brisk." Harvard Business School Case 512-011, September 2011. (Revised December 2012.)
  • September 2016 (Revised July 2018)
  • Case

United Airlines: More Out-and-Back Flying?

By: Ryan W. Buell, Willy Shih and Mike Toffel
This case looks at United Airlines when it is facing a decision on whether to shift its aircraft routing to more "out-and-back" routing in order to try to improve its on-time performance. As one of the world's largest airlines, United had a very large fleet and... View Details
Keywords: Service Excellence; Service Management; Service Quality; Service Quality Competition; Services; Airline Industry; Airlines; Operational Complexity; Operational Disruptions; Operational Effectiveness; Operations Improvement; Operations Management; Operations Strategy; Air Transportation; Operations; Service Operations; Service Delivery; Performance Effectiveness; Performance Improvement; Complexity; Air Transportation Industry; United States
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Buell, Ryan W., Willy Shih, and Mike Toffel. "United Airlines: More Out-and-Back Flying?" Harvard Business School Case 617-010, September 2016. (Revised July 2018.)

    Meg Rithmire

    Meg Rithmire is the James E. Robison Professor in the Business, Government, and International Economy Unit. Professor Rithmire holds a PhD in Government from Harvard University, and her primary expertise is in the comparative political economy of development with a... View Details

    Keywords: real estate

      Karim R. Lakhani

      Karim R. Lakhani is the Dorothy & Michael Hintze Professor of Business Administration at the Harvard Business School. He specializes in technology management, innovation, digital transformation and artificial... View Details

      Keywords: biotechnology; communications; computer; health care; high technology; information technology industry; internet; pharmaceuticals; software; video games
      • March 2002 (Revised May 2007)
      • Case

      Customer Profitability and Customer Relationship Management at RBC Financial Group (Abridged)

      By: V.G. Narayanan and Lisa Brem
      The Royal Bank of Canada uses customer relationship management and customer profitability tools to gain a competitive advantage in Canada's increasingly crowded financial services market. The case presents two pricing and customer management issues: one from the point... View Details
      Keywords: Customers; Customer Relationship Management; Price; Perspective; Marketing; Competitive Advantage; Financial Services Industry; Banking Industry; Canada
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      Narayanan, V.G., and Lisa Brem. "Customer Profitability and Customer Relationship Management at RBC Financial Group (Abridged)." Harvard Business School Case 102-072, March 2002. (Revised May 2007.)
      • July 2011 (Revised September 2018)
      • Case

      Nashton Partners and Its Search Fund Process

      By: Richard S. Ruback and Royce Yudkoff
      Nashton Partners was a search fund founded by two HBS MBA's that raised $500,000 to finance a search for a company that they could purchase and then run for the next five to ten years. The case examines the search fund structure, the two-year search, and two potential... View Details
      Keywords: Acquisition; Capital Structure; Financing and Loans; Investment Funds; Partners and Partnerships
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      Ruback, Richard S., and Royce Yudkoff. "Nashton Partners and Its Search Fund Process." Harvard Business School Case 212-006, July 2011. (Revised September 2018.)
      • 11 Sep 2023
      • Blog Post

      Reflections on My First Semester Teaching at HBS

      to the visitors - it's intimidating to visit HBS; it definitely took me a month in the classroom to settle into my more authentic self.) 2. Taking risks - In our entrepreneurship teaching group, we talk... View Details
      • May 2009
      • Case

      Ceres Gardening Company: Funding Growth in Organic Products

      By: John H. McArthur and Sunru Yong
      Ceres is a leading player in the growing organic gardening industry, selling seeds, small plants, and related items. Their distribution depends heavily on retail sales through independent nurseries and garden centers. Because these small dealers are unable to finance... View Details
      Keywords: Accounting Procedures; Marketing; Business Growth; Plant-Based Agribusiness; Marketing Strategy; Expansion; Business Growth and Maturation; Marketing Channels; Credit; Financial Statements; Sales; Retail Industry; Agriculture and Agribusiness Industry
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      McArthur, John H., and Sunru Yong. "Ceres Gardening Company: Funding Growth in Organic Products." Harvard Business School Brief Case 094-017, May 2009.
      • April 2011
      • Supplement

      Felipe Calderón: Leading with Light and Power (B)

      By: J. Bruce Harreld and David Lane
      This sequence of cases explores how leaders get their team focused on framing, analyzing, and ultimately acting upon complex decisions. The A case provides an inside look as President of Mexico, Felipe Calderon, works with his cabinet ministers to decide how to... View Details
      Keywords: Management Analysis, Tools, and Techniques; Decision Choices and Conditions; Cases; Crime and Corruption; State Ownership; Business or Company Management; Economics; Risk and Uncertainty; Finance; Performance; Management Teams; Strategic Planning; Energy Industry; Mexico City
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      Harreld, J. Bruce, and David Lane. "Felipe Calderón: Leading with Light and Power (B)." Harvard Business School Supplement 811-080, April 2011.
      • March 2012 (Revised January 2013)
      • Case

      Boston Children's Hospital: Measuring Patient Costs

      By: Robert S. Kaplan, Mary L. Witkowski and Jessica A. Hohman
      The case describes two pilot projects on applying activity-based costing to measuring the cost of treating patients. It presents process maps and financial data relating to the processes used during (1) an office visit to a plastic surgeon for three different diagnoses... View Details
      Keywords: Health Care; Time-Driven Activity-Based Costing; Costing; Hospitals; Activity Based Costing and Management; Mathematical Methods; Health Industry
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      Kaplan, Robert S., Mary L. Witkowski, and Jessica A. Hohman. "Boston Children's Hospital: Measuring Patient Costs." Harvard Business School Case 112-086, March 2012. (Revised January 2013.)
      • July 2017
      • Case

      Centerbridge Partners and Great Wolf Resorts: Buying from a Highly Regarded Competitor

      By: Josh Lerner, John D. Dionne and Amram Migdal
      The case examines the March 2015 Centerbridge Partners investment decision regarding whether to acquire Great Wolf Resorts, a North American family-oriented indoor water parks and hotel operator, from a private equity (PE) competitor, Apollo Global Management. The case... View Details
      Keywords: Private Equity Financing; Commercial Mortgage Backed Securities; CMBS; Secondary Buyouts; Business Ventures; Acquisition; Finance; Borrowing and Debt; Cost; Cost of Capital; Equity; Private Equity; Financial Instruments; Debt Securities; Accommodations Industry; Entertainment and Recreation Industry; Financial Services Industry; North and Central America; United States
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      Lerner, Josh, John D. Dionne, and Amram Migdal. "Centerbridge Partners and Great Wolf Resorts: Buying from a Highly Regarded Competitor." Harvard Business School Case 818-023, July 2017.
      • 22 Jan 2014
      • Working Paper Summaries

      Separating Homophily and Peer Influence with Latent Space

      Keywords: by Joseph P. Davin, Sunil Gupta & Mikołaj Jan Piskorski
      • Web

      Introduction - Option Pricing in Theory & Practice: The Nobel Prize Research of Robert C. Merton - Exhibits - Historical Collections

      be awarded to Professor Robert C. Merton, Harvard University, and Professor Myron S. Scholes, Stanford University, "for a new method to determine the value of derivatives." Robert Merton is View Details
      • November 2013 (Revised November 2014)
      • Case

      Infection Control at Massachusetts General Hospital

      By: Robert S. Huckman and Nikolaos Trichakis

      The case explores the challenges facing Massachusetts General Hospital concerning the adoption of a new infection control policy, which promises to improve operational performance, patient safety, and profitability. The new policy requires coordination between... View Details

      Keywords: Safety; Organizational Change and Adaptation; Integration; Health Care and Treatment; Policy; Health Industry; Boston
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      Huckman, Robert S., and Nikolaos Trichakis. "Infection Control at Massachusetts General Hospital." Harvard Business School Case 614-044, November 2013. (Revised November 2014.)
      • June 2013 (Revised July 2017)
      • Case

      Angus Cartwright IV

      By: Kenneth J. Hatten, William J. Poorvu, Howard H. Stevenson, Arthur I Segel and John H. Vogel, Jr.
      Judy and John DeRight, looking to diversify their investment portfolios, have retained Angus Cartwright, Jr. to identify prospective real estate acquisitions. Mr. Cartwright has four potential properties that he feels merit an in-depth financial analysis. The case... View Details
      Keywords: Acquisition; Cash Flow; Investment Return; Investment Portfolio; Taxation; Balanced Scorecard; Valuation
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      Hatten, Kenneth J., William J. Poorvu, Howard H. Stevenson, Arthur I Segel, and John H. Vogel, Jr. "Angus Cartwright IV." Harvard Business School Case 813-185, June 2013. (Revised July 2017.)
      • September 1998 (Revised May 2002)
      • Case

      Cisco Systems, Inc.: Implementing ERP

      By: Robert D. Austin, Richard L. Nolan and Mark J. Cotteleer
      Reviews Cisco System's approach to implementing Oracle's Enterprise Resource Planning (ERP) software product. This case chronologically reviews the diverse, critical success factors and obstacles facing Cisco during its implementation. Cisco faced the need for... View Details
      Keywords: Information Technology; Applications and Software; Technology Adoption; Complexity; Information Management
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      Austin, Robert D., Richard L. Nolan, and Mark J. Cotteleer. "Cisco Systems, Inc.: Implementing ERP." Harvard Business School Case 699-022, September 1998. (Revised May 2002.)
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