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- All HBS Web (2,041)
- Faculty Publications (476)
- 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
Rayport, Jeffrey F., Nicole Tempest Keller, and Nicole Luo. "Duolingo: On a 'Streak'." Harvard Business School Case 825-097, January 2025. (Revised April 2025.)
- March 2021 (Revised April 2021)
- Case
Wirecard: The Downfall of a German Fintech Star
By: Jonas Heese, Charles C.Y. Wang and Tonia Labruyere
Wirecard was a German fintech company, member of the DAX30, that provided payment processing and related services. Wirecard had enjoyed large growth rates over the years and most investors and analysts were enthusiastic about the company's prospects. Wirecard's... View Details
Keywords: Accounting Fraud; Scandal; Accounting Audits; Accounting; Financial Reporting; Financial Institutions; Financial Markets; Corporate Governance; Governance Compliance; Corporate Accountability; Governance Controls; Financial Services Industry; Germany; Singapore; Dubai
Heese, Jonas, Charles C.Y. Wang, and Tonia Labruyere. "Wirecard: The Downfall of a German Fintech Star." Harvard Business School Case 121-058, March 2021. (Revised April 2021.)
- Research Summary
Overview
Professor Begenau’s research agenda is directed at better understanding how financial markets work and how they affect the real economy. She uses quantitative analysis to build both prescriptive and descriptive models concerning financial risk in banking, and she also... View Details
- July 2023 (Revised May 2024)
- Case
Vytal: Packaging-as-a-Service
By: George Serafeim, Michael W. Toffel, Lena Duchene and Daniela Beyersdorfer
The Germany-based startup Vytal operated the largest digital-native reusable packaging-as-a-service network globally, having raised nearly €15 million, established a large network of restaurant partners, and prevented the use of millions of single-use take-out food... View Details
Keywords: Climate Risk; Digital; Platform Strategies; Data; Packaging; Sustainability; Start-up; Startup; Entrepreneur; Impact; Circular; Growth Strategy; Innovation; Environmental Sustainability; Innovation and Invention; Business Growth and Maturation; Growth and Development Strategy; Business Startups; Resource Allocation; Risk Management; Adoption; Strategy; Performance Productivity; Service Delivery; Service Operations; Supply Chain; Distribution; Entrepreneurship; Climate Change; Green Technology Industry; Service Industry; Retail Industry; Germany; Europe
Serafeim, George, Michael W. Toffel, Lena Duchene, and Daniela Beyersdorfer. "Vytal: Packaging-as-a-Service." Harvard Business School Case 124-007, July 2023. (Revised May 2024.)
- April 2018
- Teaching Note
InsideSales.com (A) and (B)
By: Frank Cespedes
Teaching Note for HBS Nos. 817-018 and 817-042. InsideSales.com (ISC) has been successful selling its software to small- and medium-sized businesses (SMB). But for various reasons, the founders see “the next stage of growth” as building a scalable sales and service... View Details
- Article
Soul and Machine (Learning)
By: Davide Proserpio, John R. Hauser, Xiao Liu, Tomomichi Amano, Burnap Alex, Tong Guo, Dokyun (DK) Lee, Randall Lewis, Kanishka Misra, Eric Schwarz, Artem Timoshenko, Lilei Xu and Hema Yoganarasimhan
Machine learning is bringing us self-driving cars, medical diagnoses, and language translation, but how can machine learning help marketers improve marketing decisions? Machine learning models predict extremely well, are scalable to “big data,” and are a natural fit to... View Details
Keywords: Machine Learning; Marketing Applications; Knowledge; Technological Innovation; Core Relationships; Marketing; Applications and Software
Proserpio, Davide, John R. Hauser, Xiao Liu, Tomomichi Amano, Burnap Alex, Tong Guo, Dokyun (DK) Lee, Randall Lewis, Kanishka Misra, Eric Schwarz, Artem Timoshenko, Lilei Xu, and Hema Yoganarasimhan. "Soul and Machine (Learning)." Marketing Letters 31, no. 4 (December 2020): 393–404.
- 13 Oct 2006
- Working Paper Summaries
Pricing Liquidity: The Quantity Structure of Immediacy Prices
- 13 Apr 2007
- Working Paper Summaries
Incorporating Price and Inventory Endogeneity in Firm-Level Sales Forecasting
- 12 PM – 1 PM EDT, 28 Sep 2016
- Webinars: Career
5 Happiness Hacks That Drive Productivity, Sales, and Creativity
According to Harvard Business Review, happy people are 37% more productive, have 31% higher sales, and are three times more creative than their peers. In this webinar, Neil Pasricha (MBA 2007) provides models to create lasting happiness including building diverse... View Details
- 20 Oct 2011
- Research & Ideas
Getting the Marketing Mix Right
whereas gains from detailing would come at the expense of competing drugs (84 percent). By contrast, the random coefficient logit model predicted that gains from DTCA, M&E, and detailing would come View Details
Keywords: by Dina Gerdeman
- October 2013 (Revised December 2013)
- Case
Intuit QuickBooks: From Product to Platform
By: Andrei Hagiu and Elizabeth J. Altman
This case focuses on the challenges and opportunities faced by a successful incumbent organization attempting to transform a large portion of its business from a traditionally product-centric operating mode to a platform-based one that leverages network effects to... View Details
Keywords: Business Model; Organizational Change and Adaptation; Digital Platforms; Competitive Advantage; Network Effects; Consumer Products Industry
Hagiu, Andrei, and Elizabeth J. Altman. "Intuit QuickBooks: From Product to Platform." Harvard Business School Case 714-433, October 2013. (Revised December 2013.)
- 2011
- Working Paper
The Flexible Substitution Logit: Uncovering Category Expansion and Share Impacts of Marketing Instruments
By: Qiang Liu, Thomas J. Steenburgh and Sachin Gupta
Different instruments are relevant for different marketing objectives (category demand expansion or market share stealing). To help brand managers make informed marketing mix decisions, it is essential that marketing mix models appropriately measure the different... View Details
Keywords: Decision Choices and Conditions; Forecasting and Prediction; Investment; Brands and Branding; Marketing Strategy; Demand and Consumers; Mathematical Methods
Liu, Qiang, Thomas J. Steenburgh, and Sachin Gupta. "The Flexible Substitution Logit: Uncovering Category Expansion and Share Impacts of Marketing Instruments." Harvard Business School Working Paper, No. 12-012, September 2011.
- Research Summary
Overcoming Large-N, Small-T Issues in Asset Pricing Tests
The large-N, small-T (i.e. large cross-section, short time series) nature of our asset data presents serious estimation problems for empirical asset pricing. In response, the literature tests asset pricing models against 10-25 test assets or portfolios. A... View Details
- February 2008 (Revised November 2008)
- Case
Radical Collaboration: IBM Microelectronics Joint Development Alliances
By: Willy Shih, Gary Pisano and Andrew A. King
IBM's "Radical Collaboration" model has been an innovative approach to meeting the challenges of the huge R&D and capital investments that are needed to stay competitive in the global semiconductor industry. This model has required a rethinking of what is proprietary,... View Details
Keywords: Cost Management; Investment; Collaborative Innovation and Invention; Problems and Challenges; Alliances; Networks; Partners and Partnerships; Research and Development; Competitive Advantage; Semiconductor Industry
Shih, Willy, Gary Pisano, and Andrew A. King. "Radical Collaboration: IBM Microelectronics Joint Development Alliances." Harvard Business School Case 608-121, February 2008. (Revised November 2008.)
- January 2009 (Revised October 2012)
- Case
Semiconductor Manufacturing International Corporation: 'Reverse BOT'
By: Willy Shih
Semiconductor Manufacturing International Corporation (SMIC) is executing a strategy that leverages the desires of municipalities in China to build clusters of high technology companies. By partnering with those cities to build new semiconductor fabs that SMIC would... View Details
Keywords: Growth and Development Strategy; Industry Clusters; Infrastructure; State Ownership; Business and Community Relations; Semiconductor Industry; China
Shih, Willy. "Semiconductor Manufacturing International Corporation: 'Reverse BOT'." Harvard Business School Case 609-062, January 2009. (Revised October 2012.)
- September 2010
- Article
Do Inventory and Gross Margin Data Improve Sales Forecasts for U.S. Public Retailers?
By: Saravanan Kesavan, Vishal Gaur and Ananth Raman
Firm-level sales forecasts for retailers can be improved if we incorporate cost of goods sold, inventory, and gross margin (defined here as the ratio of sales to cost of goods sold) as three endogenous variables. We construct a simultaneous equations model, estimated... View Details
Keywords: Sales; Forecasting and Prediction; Distribution; Goods and Commodities; Cost; Public Sector; Profit; Mathematical Methods; Analytics and Data Science; Retail Industry; United States
Kesavan, Saravanan, Vishal Gaur, and Ananth Raman. "Do Inventory and Gross Margin Data Improve Sales Forecasts for U.S. Public Retailers?" Management Science 56, no. 9 (September 2010): 1519–1533.
- 01 Apr 2025
- HBS Seminar
Eric Bradlow, University of Pennsylvania
- June 2019
- Article
Social Risk, Fiscal Risk, and the Portfolio of Government Programs
We develop a model of government portfolio choice in which a benevolent government chooses the scale of risky projects in the presence of market failures and tax distortions. These two frictions generate motives to manage social risk and fiscal risk. Social risk... View Details
Hanson, Samuel G., David S. Scharfstein, and Adi Sunderam. "Social Risk, Fiscal Risk, and the Portfolio of Government Programs." Review of Financial Studies 32, no. 6 (June 2019): 2341–2382. (Internet Appendix Here.)
- 02 Oct 2020
- News
Computer Simulations Are Better — and More Affordable — than Ever
- September 2018
- Article
Asset Price Dynamics in Partially Segmented Markets
By: Robin Greenwood, Samuel G. Hanson and Gordon Y. Liao
We develop a model in which capital moves quickly within an asset class but slowly between asset classes. While most investors specialize in a single asset class, a handful of generalists can gradually reallocate capital across markets. Upon the arrival... View Details
Greenwood, Robin, Samuel G. Hanson, and Gordon Y. Liao. "Asset Price Dynamics in Partially Segmented Markets." Review of Financial Studies 31, no. 9 (September 2018): 3307–3343. (Internet Appendix Here.)