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- 2025
- Working Paper
An Empirical Examination of Business Climate Alliances: Effective and/or Harmful?
By: Matteo Gasparini and Peter Tufano
This research studies business alliances that seek to address climate change, offering empirical evidence to address claims advanced by alliance supporters and critics. We study eleven major alliance mostly focused on financial services firms and 424 major... View Details
Keywords: Antitrust; Climate Change; Financial Institutions; Competition; Network Effects; Alliances
Gasparini, Matteo, and Peter Tufano. "An Empirical Examination of Business Climate Alliances: Effective and/or Harmful?" Harvard Business School Working Paper, No. 25-060, May 2025.
- Working Paper
Index Rebalancing and Stock Market Composition: Do Indexes Time the Market?
By: Marco Sammon and John J. Shim
Value-weighted indexes must rebalance in response to stock market composition changes, e.g., issuance, buybacks, and IPOs. In doing so, existing index funds implicitly engage in market timing. Index funds’ long-short rebalancing portfolios have a -3.5% annual return... View Details
Sammon, Marco, and John J. Shim. "Index Rebalancing and Stock Market Composition: Do Indexes Time the Market?" SSRN Working Paper Series, No. 5080459, May 2025.
- 2025
- Working Paper
Generative AI Use by Capital Market Information Intermediaries: Evidence from Seeking Alpha
By: Mark Bradshaw, Chenyang Ma, Benjamin Yost and Yuan Zou
We study the use of generative AI for firm-specific financial analysis on the Seeking Alpha platform. We find that, after the initial launch of ChatGPT in November 2022, the share of AI-generated articles rose sharply to 13.4% of all articles, then declined in late... View Details
Keywords: Generative Ai; Seeking Alpha; Equity Research; Large Language Models; Gpt; AI and Machine Learning; Information Publishing; Financial Markets
Bradshaw, Mark, Chenyang Ma, Benjamin Yost, and Yuan Zou. "Generative AI Use by Capital Market Information Intermediaries: Evidence from Seeking Alpha." Harvard Business School Working Paper, No. 25-055, April 2025.
- April 2025
- Article
Serving with a Smile on Airbnb: Analyzing the Economic Returns and Behavioral Underpinnings of the Host’s Smile
By: Shunyuan Zhang, Elizabeth Friedman, Kannan Srinivasan, Ravi Dhar and Xupin Zhang
Non-informational cues, such as facial expressions, can significantly influence judgments and interpersonal impressions. While past research has explored how smiling affects business outcomes in offline or in-store contexts, relatively less is known about how smiling... View Details
Keywords: Sharing Economy; Airbnb; Image Feature Extraction; Machine Learning; Facial Expressions; Prejudice and Bias; Nonverbal Communication; E-commerce; Consumer Behavior; Perception
Zhang, Shunyuan, Elizabeth Friedman, Kannan Srinivasan, Ravi Dhar, and Xupin Zhang. "Serving with a Smile on Airbnb: Analyzing the Economic Returns and Behavioral Underpinnings of the Host’s Smile." Journal of Consumer Research 51, no. 6 (April 2025): 1073–1097.
- April 2025
- Article
The Allocation of Socially Responsible Capital
By: Daniel Green and Benjamin N. Roth
Portfolio allocation decisions increasingly incorporate social values. We develop a tractable framework to study how competition between investors to own socially valuable assets affects social welfare. Relative to the most common social-investing strategies, we... View Details
Keywords: Socially Responsible Investing; Investment Portfolio; Welfare; Social Issues; Investment Return
Green, Daniel, and Benjamin N. Roth. "The Allocation of Socially Responsible Capital." Journal of Finance 80, no. 2 (April 2025): 755–781.
- April 2025
- Article
The Disappearing Index Effect
By: Robin Greenwood and Marco Sammon
The abnormal return associated with a stock being added to the S&P 500 has fallen from an average
of 7.4% in the 1990s to 0.3% over the past decade. This has occurred despite a significant increase in the
share of stock market assets linked to the index. A similar... View Details
Greenwood, Robin, and Marco Sammon. "The Disappearing Index Effect." Journal of Finance 80, no. 2 (April 2025): 657–698.
- 2025
- Working Paper
With a Little Help from My Family: Informal Startup Financing
By: Brian K. Baik, Johan Ludvig S. Karlsen and Katja Kisseleva
Using Norwegian administrative data, we identify family equity investments in startups
and examine their effects on investor returns and firm behavior. Informal investors
earn lower returns than external individuals, and the firms they back are less
likely to secure... View Details
Keywords: Early Stage Finance; Informal Investment; Household Finance; Risk Taking; Entrepreneurial Finance; Entrepreneurship; Personal Finance; Family and Family Relationships; Business Startups; Investment; Norway
Baik, Brian K., Johan Ludvig S. Karlsen, and Katja Kisseleva. "With a Little Help from My Family: Informal Startup Financing." Harvard Business School Working Paper, No. 25-053, April 2025.
- 25 Mar 2025
- Other Presentation
Louis E. Caldera on the Panama Canal and DEI Under Trump's Administration
By: Louis Caldera and June Carolyn Erlick
Louis E. Caldera, a Senior Lecturer at Harvard Business School, chaired the Panama Canal Commission the year the Canal was returned to Panama, 1999. He was also the first (and only) Latino to serve as Secretary of the Army. He talks on issues ranging from President... View Details
"Louis E. Caldera on the Panama Canal and DEI Under Trump's Administration." Faculty Voices (podcast), Harvard University, David Rockefeller Center for Latin American Studies, March 25, 2025.
- March 2025 (Revised May 2025)
- Case
Primetime Partners: Investing in Healthspan, Wealthspan, and Workspan
By: Rembrand Koning, Nicole Tempest Keller and Susan Wilner Golden
In the fall of 2024, Abby Miller Levy (HBS ’01), co-founder and managing partner of Primetime Partners, was preparing to raise a second fund. Founded in 2020 with veteran investor Alan Patricof, Primetime was a horizontal fund focused on early-stage companies serving... View Details
Keywords: Investment Funds; Age; Social Issues; Financing and Loans; Investment Return; Business Strategy; Financial Services Industry; United States
Koning, Rembrand, Nicole Tempest Keller, and Susan Wilner Golden. "Primetime Partners: Investing in Healthspan, Wealthspan, and Workspan." Harvard Business School Case 825-095, March 2025. (Revised May 2025.)
- 2025
- Working Paper
Centralized Governance in Decentralized Organizations
By: Lin William Cong, Daniel Rabetti, Charles C.Y. Wang and Yu Yan
We systematically document governance centralization in decentralized autonomous organizations (DAOs) and study its drivers and economic implications. Using multiple data sources and granular on-chain transactional data, we compare our findings to those in corporate... View Details
Cong, Lin William, Daniel Rabetti, Charles C.Y. Wang, and Yu Yan. "Centralized Governance in Decentralized Organizations." Working Paper, March 2025.
- March 2025
- Article
Boomerasking: Answering Your Own Questions
By: Alison Wood Brooks and Michael Yeomans
Humans spend much of their lives in conversation, where they tend to hold many simultaneous motives. We examine two fundamental desires: to be responsive to a partner and to disclose about oneself. We introduce one pervasive way people attempt to reconcile these... View Details
Brooks, Alison Wood, and Michael Yeomans. "Boomerasking: Answering Your Own Questions." Journal of Experimental Psychology: General 154, no. 3 (March 2025): 864–893.
- 2025
- Working Paper
Tax Planning, Illiquidity, and Credit Risks: Evidence from DeFi Lending
By: Lisa De Simone, Peiyi Jin and Daniel Rabetti
This study establishes a plausible causal link between tax-planning-induced illiquidity and credit risks in lending markets. Exploiting an exogenous tax shock imposed by the Internal Revenue Service (IRS) on cryptocurrency gains, along with millions of transactions in... View Details
Keywords: Cryptocurrency; Taxation; Financial Liquidity; Credit; Financing and Loans; Financial Markets
De Simone, Lisa, Peiyi Jin, and Daniel Rabetti. "Tax Planning, Illiquidity, and Credit Risks: Evidence from DeFi Lending." Working Paper, February 2025.
- February 2025
- Article
Variation in Batch Ordering of Imaging Tests in the Emergency Department and the Impact on Care Delivery
By: Jacob C. Jameson, Soroush Saghafian, Robert S. Huckman and Nicole Hodgson
Objectives: To examine heterogeneity in physician batch ordering practices and measure the impact of a physician's tendency to batch order imaging tests on patient outcomes and resource utilization.
Study Setting and Design: In this retrospective study, we used... View Details
Study Setting and Design: In this retrospective study, we used... View Details
Keywords: Health Care; Operations Management; Productivity; Health Care and Treatment; Operations; Outcome or Result; Resource Allocation; Health Industry; United States
Jameson, Jacob C., Soroush Saghafian, Robert S. Huckman, and Nicole Hodgson. "Variation in Batch Ordering of Imaging Tests in the Emergency Department and the Impact on Care Delivery." Health Services Research 60, no. 1 (February 2025).
- 10 Dec 2024
- Interview
A New Model for Funding Healthcare Innovation
By: Regina E. Herzlinger and Duke Rohlen
Ajax Health founder Duke Rohlen (HBS MBA 2001) and HBS Professor Regina Herzlinger join host Brian Kenny to discuss the key success factors for both start-up and established medical technology firms. The case “Ajax Health: A New Model for Medical Technology Innovation”... View Details
Keywords: Entrepreneurship; Innovation and Invention; Business Model; Private Equity; Health Industry
Herzlinger, Regina E., and Duke Rohlen. "A New Model for Funding Healthcare Innovation." Cold Call (podcast), Harvard Business Review Group, December 10, 2024.
- December 2024 (Revised January 2025)
- Case
Balancing Returns and Responsibilities at Raya Partners
By: Arthur Segel, Ephraim Mernick, Derek C. M. van Bever and Olivia Barba
Raya Partners, a private equity firm, faces a crucial decision regarding Asa Specialty Coatings Company (ASCC). The dilemma involves shifting ASCC's manufacturing operations to Mexico, a move that would boost profitability and reduce emissions but result in significant... View Details
Keywords: Factories, Labs, and Plants; Communication Strategy; Private Equity; Job Cuts and Outsourcing; Corporate Social Responsibility and Impact; Environmental Sustainability; Values and Beliefs; Financial Services Industry; Manufacturing Industry; Mexico; Vermont
Segel, Arthur, Ephraim Mernick, Derek C. M. van Bever, and Olivia Barba. "Balancing Returns and Responsibilities at Raya Partners." Harvard Business School Case 325-068, December 2024. (Revised January 2025.)
- December 2024 (Revised March 2025)
- Case
Tata Power and India's Energy Transition
By: Vikram S. Gandhi, Radhika Kak and Kairavi Dey
Tata Power stood at the forefront of India’s energy transition. The firm had a long history deeply intertwined with the country's development. As Mumbai’s power needs increased, Tata Power built out thermal assets across North, West, and East India. While thermal power... View Details
Keywords: Renewable Energy; Energy Sources; Climate Change; Green Technology; Transition; Energy Generation; Resource Allocation; Energy Industry; Asia; India
Gandhi, Vikram S., Radhika Kak, and Kairavi Dey. "Tata Power and India's Energy Transition." Harvard Business School Case 325-081, December 2024. (Revised March 2025.)
- 2024
- Working Paper
Climate Solutions, Transition Risk, and Stock Returns
By: Shirley Lu, Edward J. Riedl, Simon Xu and George Serafeim
Using large language models to measure firms' climate solution products and services, we find that high-climate solution firms exhibit lower stock returns and higher market valuation multiples. Their stock prices respond positively to events signaling increased demand... View Details
Keywords: Technology; Generative Ai; Large Language Models; Climate Finance; Climate Change; Innovation and Invention; Environmental Sustainability; AI and Machine Learning; Investment; Financial Markets
Lu, Shirley, Edward J. Riedl, Simon Xu, and George Serafeim. "Climate Solutions, Transition Risk, and Stock Returns." Harvard Business School Working Paper, No. 25-024, November 2024.
- 2024
- Working Paper
Hidden Risk
By: Daniel Barth, Phillip Monin, Emil Siriwardane and Adi Sunderam
Since 2013, large U.S. hedge fund advisers have been required to report risk exposures in their regulatory filings. Using these data, we first establish that managers’ perceptions of risk contain useful information that is not embedded in fund returns. Investor flows... View Details
Keywords: Corporate Disclosure; Investment Funds; Risk and Uncertainty; Investment Return; Communication Strategy; Financial Services Industry
Barth, Daniel, Phillip Monin, Emil Siriwardane, and Adi Sunderam. "Hidden Risk." Working Paper, November 2024.
- 2024
- Working Paper
Categorical Processing in a Complex World
By: Marco Sammon, Thomas Graeber and Christopher Roth
In real-world news environments, quantitative information is rarely presented in isolation; it is characterized through qualitative comparisons with various reference levels. Company earnings, for example, are commonly compared to analyst forecasts, previous earnings,... View Details
- October 2024
- Case
Estímulo: Blended Finance in Brazil
By: Vikram S. Gandhi, James Barnett, Maxim Pike Harrell and Marina Osborn
In December 2022, Estímulo—a Brazilian impact investment fund supporting small businesses—found itself at a crossroads. The fund was established in 2020 to provide emergency relief through accessible credit and financial education. When low default rates from borrowers... View Details
Keywords: Credit; Financial Management; Financing and Loans; Investment; Social Enterprise; Business Model; Financial Services Industry; Brazil; South America; Latin America
Gandhi, Vikram S., James Barnett, Maxim Pike Harrell, and Marina Osborn. "Estímulo: Blended Finance in Brazil." Harvard Business School Case 325-016, October 2024.