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New research on investing from Harvard Business School faculty on issues including institutional investing, foreign direct investment, and investment activism.
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Impact Investing: A Theory of Financing Social Entrepreneurship

by Benjamin N. Roth

The author provides a formal definition of organizational sustainability and characterizes the situations in which a social enterprise should be sustainable. The analysis then delineates when an investment in a social enterprise delivers superior impact to a grant.

A Preliminary Framework for Product Impact-Weighted Accounts

by George Serafeim, Katie Trinh, and Robert Zochowski

Although there is growing interest in environmental, social, and governance measurement, the impact of company operations is emphasized over product use. A framework like this one that captures a product’s reach, accessibility, quality, optionality, environmental use emissions, and end of life recyclability allows for a systematic methodology that can be applied to companies across many industries.

Why CalSTRS Chooses to Engage with the Gun Industry

Should large institutional investors divest or engage if they have an issue with a company? In a recent case study, Vikram Gandhi discusses how CalSTRS, the $200 billion pension plan for California public school teachers, chose to engage with gun makers and retailers. Open for comment; Comment(s) posted.

Shareholder Activism and Firms’ Voluntary Disclosure of Climate Change Risks

by Caroline Flammer, Michael W. Toffel, and Kala Viswanathan

Shareholder resolutions typically fail, and often by a wide margin. So why do active investors bother? It turns out that resolutions nonetheless can influence corporate transparency. Specifically, after being targeted with shareholder resolutions on environmental topics, this research shows that companies are more likely to publicly disclose their climate change risks—and that such disclosure increases these companies’ valuation.

Decarbonization Factors

by Alex Cheema-Fox, Bridget LaPerla, George Serafeim, David Turkington, and Hui (Stacie) Wang

This paper contributes to a growing knowledge base about how climate change impacts investor expectations, capital allocations and thereby pricing and returns. It provides actionable insights into how to decarbonize portfolios and evaluate the likely performance and carbon exposure differences across strategies.

Should a Pension Fund Try to Change the World?

Re: Rebecca M. Henderson, George Serafeim

Can inclusivity, sustainability, and better governance boost economies? Rebecca Henderson and George Serafeim discuss the impact investing efforts of GPIF, Japan’s government pension fund. Open for comment; Comment(s) posted.

Going Digital: Implications for Firm Value and Performance

by Wilbur Chen and Suraj Srinivasan

More and more nontechnology companies are adopting digital technologies like AI, data analytics, and machine learning. This study of the economic performance of nontech firms adopting new digital technologies finds a persistent future increase in valuation. However, investors only slowly incorporate the value implications of digital activities into prices. Nontech companies with senior executives with tech talent improve performance more than those without.

Reflexivity in Credit Markets

by Robin Greenwood, Samuel G. Hanson, and Lawrence J. Jin

Investors’ biases and market outcomes affect each other in a two-way feedback loop. This study develops a model of a credit market feedback loop, finding that when investors become more bullish this can predict positive returns in the short run, even if expected returns become more negative at longer horizons.

Activist CEOs Are Rising Up—and Their Customers Are Listening

by Michael Blanding

Are product sales affected by the CEO's stance on political and social issues? Michael Toffel and Aaron Chatterji study how consumers react to vocal chief executives. Open for comment; Comment(s) posted.

Diagnostic Bubbles

by Pedro Bordalo, Nicola Gennaioli, Spencer Yongwook Kwon, and Andrei Shleifer

The financial crisis of 2007-2008 revived academic interest in price bubbles but many conceptual questions remain open. This paper generates insights into the structure of asset price bubbles by modeling beliefs from fundamental psychological assumptions, and combining this with standard neoclassical mechanisms, such as learning from prices and speculation.

'Green Bonds' May Be Our Best Bet for Environmental Damage Control

by Michael Blanding

The popularity of green bonds as a way to finance environmentally friendly projects is on the upswing, say Malcolm Baker and George Serafeim. Open for comment; Comment(s) posted.

How Companies Can Increase Market Rewards for Sustainability Efforts

by Rachel Layne

There is a connection between public sentiment about a company and how the market rewards its corporate social performance, according to George Serafeim. Is your company undervalued? Open for comment; Comment(s) posted.

Do Fire Sales Create Externalities?

by Sergey Chernenko and Adi Sunderam

This paper contributes to our understanding of the role of large institutional investors in securities markets, providing evidence that the structure of the mutual fund industry increases the risks of costly "fire sales."

Public Sentiment and the Price of Corporate Sustainability

by George Serafeim

Public opinions from industry experts are important in the economy but it has not been clear how they affect the valuation of and returns to corporate activities. Using big data and machine learning, this paper analyzes how public sentiment influences the market pricing of firms’ sustainability activities and thereby the future stock returns of portfolios that integrate environmental, social, and governance data.

IQ from IP: Simplifying Search in Portfolio Choice

by Huaizhi Chen, Lauren Cohen, Umit Gurun, Dong Lou, and Christopher J. Malloy

Mutual fund managers solve their complex “search problem” for superior investable returns by tracking—and trading—on very particular sets of firms and insiders. These sets are chosen strategically and remain very persistent over time, as does the outperformance these insiders’ trades afford to the given fund managers.

Investing Outside the Box: Evidence from Alternative Vehicles in Private Capital

by Josh Lerner, Jason Mao, Antoinette Schoar, and Nan R. Zhang

Private equity vehicles that differ from the traditional structure have become a major portion of investors’ portfolios, especially over the past decade. This study identifies differences in performance across limited and general partners participating in such vehicles, as well as across the two broad classes of alternative vehicles.

Is 'Gut Feel' a Good Reason to Invest in a Startup?

by Michael Blanding

Most investments in startups should never be made, at least when using by-the-numbers reasoning. But funded they are. Laura Huang believes investors use gut instinct to manage that risk. Open for comment; Comment(s) posted.

Expected Stock Returns Worldwide: A Log-Linear Present-Value Approach

by Akash Chattopadhyay, Matthew R. Lyle, and Charles C.Y. Wang

Over the last 20 years, shortcomings of classical asset-pricing models have motivated research in developing alternative methods for measuring ex ante expected stock returns. This study evaluates the main paradigms for deriving firm-level expected return proxies (ERPs) and proposes a new framework for estimating them.

Developing Novel Drugs

by Joshua Krieger, Danielle Li, and Dimitris Papanikolaou

This paper contributes to our understanding of how financing constraints affect the direction of innovation in drug development. The authors develop a new measure of drug novelty based on molecular characteristics, and explore the tradeoffs involved in decisions to develop more novel therapies. Open for comment; Comment(s) posted.

Mutual Funds as Venture Capitalists? Evidence from Unicorns

by Sergey Chernenko, Josh Lerner, and Yao Zeng

Larger mutual funds and those having more stable funding are more likely to invest in privately held startups known as unicorns. Mutual funds are less involved in corporate governance, especially boards of directors, but have more protections when it comes to liquidating their stakes.