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- Faculty Publications (475)
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- All HBS Web (2,037)
- Faculty Publications (475)
Jacob M. Cook
Jacob Cook is a Lecturer in the Marketing Unit at Harvard Business School, where he teaches the EC course Digital Marketing & AI Workshop. His work focuses on how companies design and scale customer acquisition and retention strategies using digital marketing,... View Details
- 08 Jun 2015
- Working Paper Summaries
Physician Beliefs and Patient Preferences: A New Look at Regional Variation in Health Care Spending
- Research Summary
Overview
By: Rob Markey
Most companies' leaders declare their commitment to delivering value to customers. Many have adopted language such as "customer-centric" or "customer-obsessed." Companies that consistently earn top marks for customer loyalty in their industry deliver total shareholder... View Details
- November 2000
- Case
FireDrop
By: William A. Sahlman and Michael J. Roberts
Describes the evolution of FireDrop, a new venture-backed company that has developed a new platform for e-mail communication. The FireDrop application--called a Zaplet--allows for e-mails to be continually updated so they are current when read (rather than when sent).... View Details
- April 12, 2023
- Article
Using AI to Adjust Your Marketing and Sales in a Volatile World
By: Das Narayandas and Arijit Sengupta
Why are some firms better and faster than others at adapting their use of customer data to respond to changing or uncertain marketing conditions? A common thread across faster-acting firms is the use of AI models to predict outcomes at various stages of the customer... View Details
Keywords: Forecasting and Prediction; AI and Machine Learning; Consumer Behavior; Technology Adoption; Competitive Advantage
Narayandas, Das, and Arijit Sengupta. "Using AI to Adjust Your Marketing and Sales in a Volatile World." Harvard Business Review Digital Articles (April 12, 2023).
- 2023
- Working Paper
Causal Interpretation of Structural IV Estimands
By: Isaiah Andrews, Nano Barahona, Matthew Gentzkow, Ashesh Rambachan and Jesse M. Shapiro
We study the causal interpretation of instrumental variables (IV) estimands of nonlinear, multivariate structural models with respect to rich forms of model misspecification. We focus on guaranteeing that the researcher's estimator is sharp zero consistent, meaning... View Details
Keywords: Mathematical Methods
Andrews, Isaiah, Nano Barahona, Matthew Gentzkow, Ashesh Rambachan, and Jesse M. Shapiro. "Causal Interpretation of Structural IV Estimands." NBER Working Paper Series, No. 31799, October 2023.
- 2009
- Working Paper
Technology Innovation and Diffusion as Sources of Output and Asset Price Fluctuations
By: Diego A. Comin, Mark Gertler and Ana Maria Santacreu
We develop a model in which innovations in an economy's growth potential are an important driving force of the business cycle. The framework shares the emphasis of the recent "new shock" literature on revisions of beliefs about the future as a source of fluctuations,... View Details
Keywords: Business Cycles; Economic Growth; Asset Pricing; Technological Innovation; Mathematical Methods; System Shocks; Technology Adoption
Comin, Diego A., Mark Gertler, and Ana Maria Santacreu. "Technology Innovation and Diffusion as Sources of Output and Asset Price Fluctuations." Harvard Business School Working Paper, No. 09-134, May 2009. (Revise and Resubmit at the Journal of Political Economy.)
- 2023
- Working Paper
Sending Signals: Strategic Displays of Warmth and Competence
By: Bushra S. Guenoun and Julian J. Zlatev
Using a combination of exploratory and confirmatory approaches, this research examines how
people signal important information about themselves to others. We first train machine learning
models to assess the use of warmth and competence impression management... View Details
Keywords: AI and Machine Learning; Personal Characteristics; Perception; Interpersonal Communication
Guenoun, Bushra S., and Julian J. Zlatev. "Sending Signals: Strategic Displays of Warmth and Competence." Harvard Business School Working Paper, No. 23-051, February 2023.
- September 2013 (Revised June 2019)
- Case
Marquee: Reinventing the Business of Nightlife
By: Anita Elberse, Ryan Barlow and Sheldon Wong
In January 2013, nightlife impresarios Jason Strauss and Noah Tepperberg are celebrating the re-opening of their famed New York City–based nightclub Marquee. While most clubs are over within their first one and a half years, Strauss and Tepperberg managed to keep... View Details
Keywords: Creative Industries; Nightlife; Service Management; Entertainment; Fashion; Celebrities; Event Marketing; Risk Management; Customer Relationship Management; Change Management; Supply Chain Management; Music Entertainment; Product Marketing; Entertainment and Recreation Industry; Las Vegas
Elberse, Anita, Ryan Barlow, and Sheldon Wong. "Marquee: Reinventing the Business of Nightlife." Harvard Business School Case 514-028, September 2013. (Revised June 2019.)
- August 2018
- Article
Extrapolation and Bubbles
By: Nicholas Barberis, Robin Greenwood, Lawrence Jin and Andrei Shleifer
We present an extrapolative model of bubbles. In the model, many investors form 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... View Details
Barberis, Nicholas, Robin Greenwood, Lawrence Jin, and Andrei Shleifer. "Extrapolation and Bubbles." Journal of Financial Economics 129, no. 2 (August 2018): 203–227.
- 2008
- Working Paper
'Fair Marriages:' An Impossibility
By: Bettina-Elisabeth Klaus
For the classical marriage model (introduced in Gale and Shapley, 1962) efficiency and envy-freeness are not always compatible, i.e., fair matchings do not always exist. However, for many allocation of indivisible goods models (see Velez, 2008, and references therein),... View Details
Klaus, Bettina-Elisabeth. "'Fair Marriages:' An Impossibility." Harvard Business School Working Paper, No. 09-053, October 2008.
- 2024
- Working Paper
The Value of Open Source Software
By: Manuel Hoffmann, Frank Nagle and Yanuo Zhou
The value of a non-pecuniary (free) product is inherently difficult to assess. A pervasive
example is open source software (OSS), a global public good that plays a vital role in the economy
and is foundational for most technology we use today. However, it is... View Details
Hoffmann, Manuel, Frank Nagle, and Yanuo Zhou. "The Value of Open Source Software." Harvard Business School Working Paper, No. 24-038, January 2024.
- 14 Feb 2023
- HBS Case
Is Sweden Still 'Sweden'? A Liberal Utopia Grapples with an Identity Crisis
Swedish capitalism is like.” Could this lead to the end of the high-tax “Swedish model” that like-minded nations have come to admire? Harvard Business School Professor Debora Spar, who has analyzed Sweden extensively, says no, the Swedish View Details
Keywords: by Lane Lambert
- January 2016 (Revised November 2018)
- Case
Match Next: Next Generation Middle School?
By: John J-H Kim and Daniel Goldberg
This case is set in 2015 as a team at Match Education, a high performing charter middle school in Boston, explores new staffing and technology approaches in their quest to obtain what they term "jaw dropping" results. The team hopes to test and model for other schools... View Details
Keywords: General Management; K-12; Charter Schools; Public Schools; Edtech; Education; Information Technology; Management; Public Sector; Entrepreneurship; Education Industry; Boston
Kim, John J-H, and Daniel Goldberg. "Match Next: Next Generation Middle School?" Harvard Business School Case 316-138, January 2016. (Revised November 2018.)
- March 2002 (Revised July 2004)
- Case
RWE and the Proposal for a German Electricity Regulator
In April 2001, Dietmar Kuhnt, CEO of the German energy giant RWE, had to make a decision that would affect his company's future. Profits in the electricity sector depended heavily on regulatory rules that influenced industry structure and pricing. RWE had emerged... View Details
Dyck, Alexander, Jose Gomez-Ibanez, and Christoph Meier. "RWE and the Proposal for a German Electricity Regulator." Harvard Business School Case 702-053, March 2002. (Revised July 2004.)
- 2024
- Working Paper
Consumer Inertia and Market Power
By: Alexander MacKay and Marc Remer
We study the pricing decisions of firms in the presence of consumer inertia. Inertia, which can arise from habit formation, brand loyalty, and switching costs, generates dynamic pricing incentives. These incentives mediate the impact of competition on market power in... View Details
Keywords: Consumer Inertia; Market Power; Dynamic Competition; Demand Estimation; Consumer Behavior; Markets; Performance; Competition; Price
MacKay, Alexander, and Marc Remer. "Consumer Inertia and Market Power." Harvard Business School Working Paper, No. 19-111, April 2019. (Revised January 2024. Direct download.)
- 06 Oct 2020
- Blog Post
2+2 Where Are They Now Spotlight: Curtis Wu (MBA 2018)
Charles Cooney, taught me that the hardest problems often occur at interfaces between multiple sectors. The 2+2 program offered me a way to learn the language and tools I would need to tackle tough problems at the interface of science and... View Details
- 2019
- Working Paper
Large-Scale Demand Estimation with Search Data
By: Tomomichi Amano, Andrew Rhodes and Stephan Seiler
In many online markets, traditional methods of demand estimation are difficult to implement because assortments are very large and individual products are sold infrequently. At the same time, data on consumer search (i.e., browsing) behavior are often available and are... View Details
Amano, Tomomichi, Andrew Rhodes, and Stephan Seiler. "Large-Scale Demand Estimation with Search Data." Harvard Business School Working Paper, No. 19-022, September 2018. (Revised June 2019. Stanford University Research Paper, No. 18-36, 8-20 2018.)
- January 2020
- Article
Rethinking Measurement of Pay Disparity and Its Relation to Firm Performance
By: Ethan Rouen
I develop measures of firm-level pay disparity and examine their relation to firm performance. Using comprehensive compensation data for a large sample of firms, I find no statistically significant relation between the ratio of CEO-to-mean employee compensation and... View Details
Keywords: Pay Disparity; Pay Ratio; CEO Pay Ratio; Income Inequality; Executive Compensation; Employees; Wages; Equality and Inequality; Business Ventures; Performance
Rouen, Ethan. "Rethinking Measurement of Pay Disparity and Its Relation to Firm Performance." Accounting Review 95, no. 1 (January 2020): 343–378.
- 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.)