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Show Results For
- All HBS Web
(3,163)
- People (5)
- News (697)
- Research (2,057)
- Events (8)
- Multimedia (14)
- Faculty Publications (907)
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- 2005
- Working Paper
Money Illusion in the Stock Market: The Modigliani-Cohn Hypothesis
By: Randolph B. Cohen, Christopher Polk and Tuomo Vuolteenaho
Modigliani and Cohn [1979] hypothesize that the stock market suffers from money illusion, discounting real cash flows at nominal discount rates. While previous research has focused on the pricing of the aggregate stock market relative to Treasury bills, the... View Details
Cohen, Randolph B., Christopher Polk, and Tuomo Vuolteenaho. "Money Illusion in the Stock Market: The Modigliani-Cohn Hypothesis." NBER Working Paper Series, No. 11018, January 2005.
- 1 Mar 2002 - 3 Mar 2004
- Conference Presentation
Does governance form matter? Evidence from stock market reactions to acquisitions and alliances
Villalonga, Belen, and Anita M. McGahan. "Does governance form matter? Evidence from stock market reactions to acquisitions and alliances." Paper presented at the Brigham Young University-University of Utah Winter Strategy Conference, March 1, 2002–March 3, 2004. (Also presented at the Strategic Management Society Annual International Conference, Paris, September 2002; MIT Organizational Economics lunch seminar, September 2002; NBER Productivity lunch seminar, Boston, April 2002; Harvard Business School Finance lunch seminar, September 2001; Academy of Management Association Annual Meeting, Washington DC, August 2001; Strategy Research Forum, Northwestern University, May 2001.)
- 05 Jul 2006
- Working Paper Summaries
Analyst Disagreement, Forecast Bias and Stock Returns
- March 2007
- Article
Gender Effects and Stock Market Reactions to the Announcement of Top Executive Appointments
This study uses Kanter's token status theory to link announcements of top executives to shareholder reactions, highlighting possible gender effects. Using a sample of top executive announcements from 1990 to 2000, our results show that investor reactions to the... View Details
- November 2002 (Revised April 2003)
- Case
New York Stock Exchange versus NASDAQ, The
By: Estelle S. Cantillon and Tarun Khanna
Reviews the competition between stock markets, specifically the New York Stock Exchange and NASDAQ, as it plays out both in the United States and internationally. The competition between the two exchanges is interesting because of technological developments and the... View Details
Cantillon, Estelle S., and Tarun Khanna. "New York Stock Exchange versus NASDAQ, The." Harvard Business School Case 703-439, November 2002. (Revised April 2003.)
- 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.
- 19 May 2008
- Research & Ideas
Connecting School Ties and Stock Recommendations
Social networks matter for more than just efficient Internet communication. They're also crucial for the strong performance of stock recommendations by analysts, according to researchers at Harvard Business School and the University of... View Details
- 2009
- Working Paper
Strategic Interactions in Two-Sided Market Oligopolies
By: Emmanuel Farhi and Andrei Hagiu
Strategic interactions between two-sided platforms depend not only on whether their decision variables are strategic complements or substitutes as for one-sided firms, but also -and crucially so- on whether or not the platforms subsidize one side of the market in... View Details
Keywords: Two-Sided Markets; Strategic Complements; Strategic Substitutes; Cost; Investment; Profit; One-Sided Platforms; Two-Sided Platforms; Duopoly and Oligopoly; Competitive Advantage
Farhi, Emmanuel, and Andrei Hagiu. "Strategic Interactions in Two-Sided Market Oligopolies." Harvard Business School Working Paper, No. 08-011, August 2007. (Revised February 2009.)
- Article
Risk and the Cross-Section of Stock Returns
By: Mark Seasholes, Radu Burlacu, Patrice Fontaine and Sonia Jimenez-Garces
This paper mathematically transforms unobservable rational expectation equilibrium model parameters (information precision and supply uncertainty) into a single variable that is correlated with expected returns and that can be estimated with recently observed data. Our... View Details
Keywords: Risk Premiums; Cross-sectional Asset Pricing; REE Models; Risk and Uncertainty; Asset Pricing; Investment Return
Seasholes, Mark, Radu Burlacu, Patrice Fontaine, and Sonia Jimenez-Garces. "Risk and the Cross-Section of Stock Returns." Journal of Financial Economics 105, no. 3 (September 2012): 511–522.
- 2010
- Working Paper
Quality Provision, Expected Firm Altruism and Brand Extensions
By: Julio J. Rotemberg
This paper studies quality choice in a model where consumers expect firms to act altruistically. It is shown that, under plausible assumptions regarding this altruism and the reaction of consumers to firms that demonstrate insufficient altruism, existing firms (or... View Details
Keywords: Brands and Branding; Consumer Behavior; Product Development; Corporate Social Responsibility and Impact; Quality; Mathematical Methods
Rotemberg, Julio J. "Quality Provision, Expected Firm Altruism and Brand Extensions." NBER Working Paper Series, No. 15635, January 2010.
- 24 Feb 2020
- Working Paper Summaries
Recovering Investor Expectations from Demand for Index Funds
- May 2011
- Case
Oriental Fortune Capital: Building a Better Stock Exchange
By: Josh Lerner and Keith Chi-ho Wong
When ChiNext opened in October 2009 as the second tier market of the Shenzhen Stock Exchange (SZSE), it aimed to provide Chinese entrepreneurs with equity capital and to facilitate the exits of venture capital firms and other investors which had previously relied on... View Details
Keywords: Capital Markets; Stocks; Financial Markets; Venture Capital; Private Equity; International Finance; Financial Services Industry; China
Lerner, Josh, and Keith Chi-ho Wong. "Oriental Fortune Capital: Building a Better Stock Exchange." Harvard Business School Case 811-105, May 2011.
- 2025
- Working Paper
Government-Brokerage Analysts and Market Stabilization: Evidence from China
By: Sheng Cao, Xianjie He, Charles C.Y. Wang and Huifang Yin
We show analysts at government-controlled brokerage firms serve as a market stabilization tool
in China. Using earnings forecasts from 2005–2019, we find government-brokerage analysts
issue relatively more optimistic—yet less accurate and timely—forecasts during... View Details
Keywords: Sell-side Analysts; Forecast Optimism; Forecast Accuracy; Government Incentives; Market Stabilization; Government Ownership; Coordinated Economies; Stocks; Forecasting and Prediction; Business and Government Relations; Emerging Markets
Cao, Sheng, Xianjie He, Charles C.Y. Wang, and Huifang Yin. "Government-Brokerage Analysts and Market Stabilization: Evidence from China." Harvard Business School Working Paper, No. 18-095, March 2018. (Revised March 2025.)
- 09 Jun 2020
- Working Paper Summaries
Aggregate and Firm-Level Stock Returns During Pandemics, in Real Time
- February 2018 (Revised October 2019)
- Case
Steinhoff International and the Stock Exchange
By: Siko Sikochi and Austin Lim
Nicky Newton-King, the Chief Executive Officer of the Johannesburg Stock Exchange (JSE), was put in a difficult position. A scandal had broken out at Steinhoff, a JSE-listed company, under her watch and there were calls to suspend listing of the company securities from... View Details
Keywords: Accounting; Financial Reporting; Mergers and Acquisitions; Financial Markets; Corporate Governance; Retail Industry; Manufacturing Industry; Distribution Industry; Africa; South Africa
Sikochi, Siko, and Austin Lim. "Steinhoff International and the Stock Exchange." Harvard Business School Case 118-066, February 2018. (Revised October 2019.)
- 2021
- Working Paper
Going by the Book: Valuation Ratios and Stock Returns
By: Ki-Soon Choi, Eric So and Charles C.Y. Wang
We study the use of firms’ book-to-market ratios (B/M) in value investing and its implications for comovements in firms’ stock returns and trading volumes. We show B/M has become increasingly detached from common alternative valuation ratios over time while also... View Details
Choi, Ki-Soon, Eric So, and Charles C.Y. Wang. "Going by the Book: Valuation Ratios and Stock Returns." Harvard Business School Working Paper, No. 21-126, May 2021.
- 20 Mar 2012
- Working Paper Summaries
The Stock Selection and Performance of Buy-Side Analysts
- September 2023
- Article
Stock Price Reactions to ESG News: The Role of ESG Ratings and Disagreement
By: George Serafeim and Aaron Yoon
We investigate whether ESG ratings predict future ESG news and the associated market reactions. We find that the consensus rating predicts future news, but its predictive ability diminishes for firms with large disagreement between raters. Relation between news and... View Details
Keywords: ESG; ESG (Environmental, Social, Governance) Performance; ESG Disclosure; ESG Ratings; ESG Reporting; ESG Disclosure Metrics; Sustainability; Investments; Disagreement; Rating Disagreement; Ratings; Environmental Sustainability; Social Issues; Corporate Social Responsibility and Impact; Performance; News; Investment; Financial Markets; Stocks; Price
Serafeim, George, and Aaron Yoon. "Stock Price Reactions to ESG News: The Role of ESG Ratings and Disagreement." Special Issue on RAST 2022 Conference. Review of Accounting Studies 28, no. 3 (September 2023): 1500–1530.
- 2024
- Working Paper
What Drives Variation in Investor Portfolios? Estimating the Roles of Beliefs and Risk Preferences
By: Mark Egan, Alexander MacKay and Hanbin Yang
We present an empirical model of portfolio choice that allows for the nonparametric estimation of investors' (subjective) expectations and risk preferences. Utilizing a comprehensive dataset of 401(k) plans from 2009 through 2019, we explore heterogeneity in asset... View Details
Keywords: Stock Market Expectations; Demand Estimation; Retirement Planning; Defined Contribution Retirement Plan; 401 (K); Finance; Investment Portfolio; Investment; Retirement; Behavioral Finance; Financial Services Industry; United States
Egan, Mark, Alexander MacKay, and Hanbin Yang. "What Drives Variation in Investor Portfolios? Estimating the Roles of Beliefs and Risk Preferences." Harvard Business School Working Paper, No. 22-044, December 2021. (Revisions Requested at the Review of Financial Studies. Revised April 2024. Direct download. NBER Working Paper Series, No. 29604, December 2021)
- spring 2008
- Article
Cost Reductions, Cost Padding and Stock Market Prices: The Chilean Experience with Price Cap Regulation
By: Rafael Di Tella and Alexander Dyck
Di Tella, Rafael, and Alexander Dyck. "Cost Reductions, Cost Padding and Stock Market Prices: The Chilean Experience with Price Cap Regulation." Economía 8, no. 2 (spring 2008).