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Show Results For
- All HBS Web
(462)
- News (27)
- Research (361)
- Events (14)
- Multimedia (1)
- Faculty Publications (263)
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- 2021
- Working Paper
Which Markets (Don't) Drive Pharmaceutical Innovation? Evidence From U.S. Medicaid Expansions
By: Craig Garthwaite, Rebecca Sachs and Ariel Dora Stern
Pharmaceutical innovation policy involves managing a tradeoff between high prices for new products in the short-term and stronger incentives to develop products for the future. Prior research has documented a causal relationship between market size and pharmaceutical... View Details
Keywords: Pharmaceuticals; Medicaid; Innovation and Invention; Policy; Markets; Research and Development; Pharmaceutical Industry
Garthwaite, Craig, Rebecca Sachs, and Ariel Dora Stern. "Which Markets (Don't) Drive Pharmaceutical Innovation? Evidence From U.S. Medicaid Expansions." NBER Working Paper Series, No. 28755, May 2021.
- March 2004
- Article
Do Police Reduce Crime? Estimates Using the Allocation of Police Forces after a Terrorist Attack
By: Rafael Di Tella and Ernesto Schargrodsky
An important challenge in the crime literature is to isolate causal effects of police on crime. Following a terrorist attack on the main Jewish center in Buenos Aires, Argentina, in July 1994, all Jewish institutions received police protection. Thus, this hideous event... View Details
Di Tella, Rafael, and Ernesto Schargrodsky. "Do Police Reduce Crime? Estimates Using the Allocation of Police Forces after a Terrorist Attack." American Economic Review 94, no. 1 (March 2004): 115–33.
- Research Summary
Overview
By: Isamar Troncoso
Professor Troncoso's research explores problems related to digital marketplaces and AI applications in marketing, and combines toolkits from econometrics, causal inference, and machine learning. She has studied how different platform design choices can lead to... View Details
- June 2018
- Article
Deviations from Covered Interest Rate Parity
By: Wenxin Du, Alexander Tepper and Adrien Verdelhan
We find that deviations from the covered interest rate parity (CIP) condition imply large, persistent, and systematic arbitrage opportunities in one of the largest asset markets in the world. Contrary to the common view, these deviations for major currencies are not... View Details
Du, Wenxin, Alexander Tepper, and Adrien Verdelhan. "Deviations from Covered Interest Rate Parity." Journal of Finance 73, no. 3 (June 2018): 915–957.
- 2017
- Working Paper
Homophily in Entrepreneurial Team Formation
By: Paul A. Gompers, Kevin Huang and Sophie Q. Wang
We study the role of homophily in group formation. Using a unique dataset of MBA students, we observe homophily in ethnicity and gender increases the probability of forming teams by 25%. Homophily in education and past working experience increases the probability of... View Details
Gompers, Paul A., Kevin Huang, and Sophie Q. Wang. "Homophily in Entrepreneurial Team Formation." Harvard Business School Working Paper, No. 17-104, May 2017.
- 2010
- Working Paper
Prosocial Spending and Well-Being: Cross-Cultural Evidence for a Psychological Universal
By: Lara B. Aknin, Christopher P. Barrington-Leigh, Elizabeth W. Dunn, John F. Helliwell, Robert Biswas-Diener, Imelda Kemeza, Paul Nyende, Claire Ashton-James and Michael I. Norton
This research provides the first support for a possible psychological universal: human beings around the world derive emotional benefits from using their financial resources to help others (prosocial spending). Analyzing survey data from 136 countries, we show that... View Details
Keywords: Spending; Philanthropy and Charitable Giving; Happiness; Motivation and Incentives; Welfare; Uganda; Canada
Aknin, Lara B., Christopher P. Barrington-Leigh, Elizabeth W. Dunn, John F. Helliwell, Robert Biswas-Diener, Imelda Kemeza, Paul Nyende, Claire Ashton-James, and Michael I. Norton. "Prosocial Spending and Well-Being: Cross-Cultural Evidence for a Psychological Universal." Harvard Business School Working Paper, No. 11-038, September 2010.
- 2024
- Working Paper
Principles and Content for Downstream Emissions Disclosures
By: Robert S. Kaplan and Karthik Ramanna
In a previous paper, we proposed the E-liability carbon accounting algorithm for companies to measure and subsequently reduce their own and their suppliers’ emissions. Some investors and stakeholders, however, want companies to also be accountable for downstream... View Details
Keywords: Carbon Emissions; Disclosure; Carbon Footprint; Climate Change; Measurement and Metrics; Corporate Disclosure; Environmental Sustainability; Corporate Social Responsibility and Impact
Kaplan, Robert S., and Karthik Ramanna. "Principles and Content for Downstream Emissions Disclosures." Harvard Business School Working Paper, No. 24-050, January 2024.
- April 2020
- Article
Designs for Estimating the Treatment Effect in Networks with Interference
By: Ravi Jagadeesan, Natesh S. Pillai and Alexander Volfovsky
In this paper, we introduce new, easily implementable designs for drawing causal inference from randomized experiments on networks with interference. Inspired by the idea of matching in observational studies, we introduce the notion of considering a treatment... View Details
Keywords: Experimental Design; Network Inference; Neyman Estimator; Symmetric Interference Model; Homophily
Jagadeesan, Ravi, Natesh S. Pillai, and Alexander Volfovsky. "Designs for Estimating the Treatment Effect in Networks with Interference." Annals of Statistics 48, no. 2 (April 2020): 679–712.
- November 5, 2021
- Article
Leaders: Stop Confusing Correlation with Causation
By: Michael Luca
We’ve all been told that correlation does not imply causation. Yet many business leaders, elected officials, and media outlets still make causal claims based on misleading correlations. These claims are too often unscrutinized, amplified, and mistakenly used to guide... View Details
Keywords: Behavioral Economics; Data Analysis; Organizations; Decision Making; Analytics and Data Science; Analysis; Learning
Luca, Michael. "Leaders: Stop Confusing Correlation with Causation." Harvard Business Review Digital Articles (November 5, 2021).
- 2017
- Article
Handgun Waiting Periods Reduce Gun Deaths
By: Michael Luca, Deepak Malhotra and Christopher Poliquin
Handgun waiting periods are laws that impose a delay between the initiation of a purchase and final acquisition of a firearm. We show that waiting periods, which create a “cooling off” period among buyers, significantly reduce the incidence of gun violence. We estimate... View Details
Keywords: Gun Policy; Gun Violence; Waiting Period; Injury Prevention; Policy; Safety; Governing Rules, Regulations, and Reforms; United States
Luca, Michael, Deepak Malhotra, and Christopher Poliquin. "Handgun Waiting Periods Reduce Gun Deaths." Proceedings of the National Academy of Sciences 114, no. 46 (November 14, 2017).
- 2023
- Working Paper
Market Exclusivity and Innovation: Evidence From Antibiotics
By: Edward Kong and Olivia Zhao
The US incentivizes drug innovation via patents as well as market exclusivity periods awarded by the US Food and Drug Administration. We estimate the causal effects of extending market exclusivity for an important drug class: antibiotics. Using a... View Details
Keywords: Health Testing and Trials; Innovation and Invention; Motivation and Incentives; Government Administration; Government Legislation; Pharmaceutical Industry; United States
Kong, Edward, and Olivia Zhao. "Market Exclusivity and Innovation: Evidence From Antibiotics." Working Paper, December 2023.
- November 2022
- Article
The Psychosocial Value of Employment: Evidence from a Refugee Camp
By: Reshmaan Hussam, Erin M. Kelley, Gregory Lane and Fatima Zahra
Employment may be important to wellbeing for reasons beyond its role as an income source. This paper presents a causal estimate of the psychosocial value of employment in refugee camps in Bangladesh. We involve 745 individuals in a field experiment with three arms: a... View Details
Hussam, Reshmaan, Erin M. Kelley, Gregory Lane, and Fatima Zahra. "The Psychosocial Value of Employment: Evidence from a Refugee Camp." American Economic Review 112, no. 11 (November 2022): 3694–3724.
- 2012
- Article
Journalists and the Stock Market
By: Christopher Parsons, C. Dougal, J. Engelberg and D. Garcia
We use exogenous scheduling of Wall Street Journal columnists to identify a causal relation between financial reporting and stock market performance. To measure the media's unconditional effect, we add columnist fixed effects to a daily regression of excess Dow Jones... View Details
Parsons, Christopher, C. Dougal, J. Engelberg, and D. Garcia. "Journalists and the Stock Market." Review of Financial Studies 25, no. 3 (March 2012): 639–679.
- October 2010
- Journal Article
The Flattening Firm and Product Market Competition: The Effect of Trade Liberalization on Corporate Hierarchies
By: Maria Guadalupe and Julie Wulf
This paper establishes a causal effect of product market competition on various characteristics of organizational design. Using a unique panel-dataset on firm hierarchies of large U.S. firms (1986-1999) and a quasi-natural experiment (trade liberalization), we find... View Details
Keywords: Business Ventures; Product; Markets; Competition; Organizational Design; Governing Rules, Regulations, and Reforms; Rank and Position; Organizational Structure; Decision Choices and Conditions; Change; Trade; United States
Guadalupe, Maria, and Julie Wulf. "The Flattening Firm and Product Market Competition: The Effect of Trade Liberalization on Corporate Hierarchies." American Economic Journal: Applied Economics 2, no. 4 (October 2010).
- 2009
- Other Unpublished Work
The Flattening Firm and Product Market Competition: The Effect of Trade Liberalization on Corporate Hierarchies
By: Maria Guadalupe and Julie Wulf
This paper establishes a causal effect of product market competition on various characteristics of organizational design. Using a unique panel-dataset on firm hierarchies of large U.S. firms (1986-1999) and a quasi-natural experiment (trade liberalization), we find... View Details
Keywords: Trade; Managerial Roles; Organizational Change and Adaptation; Organizational Design; Organizational Structure; Business Strategy; Competitive Strategy
Guadalupe, Maria, and Julie Wulf. "The Flattening Firm and Product Market Competition: The Effect of Trade Liberalization on Corporate Hierarchies." December 2009.
- 2023
- Working Paper
The Effects of Inconsistent Work Schedules on Employee Lateness and Absenteeism
By: Caleb Kwon and Ananth Raman
Problem Definition: Employee lateness and absenteeism pose challenges for businesses, particularly in the retail industry, where punctuality is vital for optimal store operations and customer service. This paper relates employee lateness and absenteeism with... View Details
Kwon, Caleb, and Ananth Raman. "The Effects of Inconsistent Work Schedules on Employee Lateness and Absenteeism." Working Paper, August 2023.
- April 2023
- Article
Learning Down to Train Up: Mentors Are More Effective When They Value Insights from Below
By: Ting Zhang, Dan Wang and Adam D. Galinsky
Although mentorship is vital for individual success, potential mentors often view it as a costly burden. To understand what motivates mentors to overcome this barrier and more fully engage with their mentees, we introduce a new construct, learning direction, which... View Details
Keywords: Mentoring; Learning Direction; Interpersonal Communication; Learning; Leadership Development
Zhang, Ting, Dan Wang, and Adam D. Galinsky. "Learning Down to Train Up: Mentors Are More Effective When They Value Insights from Below." Academy of Management Journal 66, no. 2 (April 2023): 604–637.
- Article
Matchmaking Promotes Happiness
By: Lalin Anik and Michael I. Norton
Four studies document and explore the psychology underlying people's proclivity to connect people to each other—to play "matchmaker." First, Study 1 shows that chronic matchmaking is associated with higher well-being. Studies 2 and 3 show that matching others on the... View Details
Anik, Lalin, and Michael I. Norton. "Matchmaking Promotes Happiness." Social Psychological & Personality Science 5, no. 6 (August 2014): 644–652.
- 2009
- Working Paper
Mental Health in the Aftermath of Conflict
By: Quy-Toan Do and Lakshmi Iyer
We survey the recent literature on the mental health effects of conflict. We highlight the methodological challenges faced in this literature, which include the lack of validated mental health scales in a survey context, the difficulties in measuring individual... View Details
Keywords: Ethnicity; War; Health Disorders; Policy; Health Care and Treatment; Conflict and Resolution; Bosnia and Hercegovina
Do, Quy-Toan, and Lakshmi Iyer. "Mental Health in the Aftermath of Conflict." Harvard Business School Working Paper, No. 10-040, November 2009.
- 2023
- Working Paper
Beyond the Hype: Unveiling the Marginal Benefits of 3D Virtual Tours in Real Estate
By: Mengxia Zhang and Isamar Troncoso
3D virtual tours (VTs) have become a popular digital tool in real estate platforms, enabling potential buyers to virtually walk through the houses they search for online. In this paper, we study home sellers’ adoption of VTs and the VTs’ relative benefits compared to... View Details
Zhang, Mengxia, and Isamar Troncoso. "Beyond the Hype: Unveiling the Marginal Benefits of 3D Virtual Tours in Real Estate." Harvard Business School Working Paper, No. 24-003, July 2023.