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- September 16, 2022
- Article
A Causal Test of the Strength of Weak Ties
By: Karthik Rajkumar, Guillaume Saint-Jacques, Iavor I. Bojinov, Erik Brynjolfsson and Sinan Aral
The authors analyzed data from multiple large-scale randomized experiments on LinkedIn’s People You May Know algorithm, which recommends new connections to LinkedIn members, to test the extent to which weak ties increased job mobility in the world’s largest... View Details
- September 2022
- Article
Experimentation and Start-up Performance: Evidence from A/B Testing
By: Rembrand Koning, Sharique Hasan and Aaron Chatterji
Recent scholarship has argued that experimentation should be the organizing principle for entrepreneurial strategy. Experimentation leads to organizational learning, which drives improvements in firm performance. We investigate this proposition by exploiting the... View Details
- September 2022
- Article
Health Externalities and Policy: The Role of Social Preferences
By: Laura Alfaro, Ester Faia, Nora Lamersdorf and Farzad Saidi
Social preferences facilitate the internalization of health externalities, for example by reducing mobility during a pandemic. We test this hypothesis using mobility data from 258 cities worldwide alongside experimentally validated measures of social preferences.... View Details
- 2022
- Working Paper
Turning Away From the State: Trade Shocks and Informal Insurance in Brazil
By: Paula Rettl
How does economic globalization affect vote choices? Conventional wisdom holds that voters who lose from economic integration support parties that propose to expand the welfare state. I argue that a key scope condition of this causal relationship is expectations about... View Details
- August 13, 2022
- Article
A Historic Opportunity for Universal Health Coverage in India
By: Vikram Patel, Shubhangi Bhadada, Kiran Mazumdar-Shaw, Arnab Mukherji, Tarun Khanna and Gagandeep Kang
The milestone of India's 75th anniversary of independence on Aug 15, 2022, offers an opportunity to reassert the country's commitment to realising universal health coverage (UHC). The first such effort predates independence, with the 1946 Bhore Committee report.... View Details
- August 2022 (Revised August 2023)
- Case
NOW PT (A): Should We Invest?
By: George A Riedel, Amy Klopfenstein and Mel Martin
In fall 2021, a team of students from the HBS Impact Investing Fund considered Neurologic Optimal Wellness Physical Therapy (NOW PT) for a potential investment. Dr. Banks, the founder of NOW PT, drove to visit patients. She sought an investment from the fund to open a... View Details
- August 2022
- Case
Rocket Learning: Evidence in Action
By: Brian Trelstad, Tomas Rosales and Malini Sen
Founders of Rocket Learning, an India-based nonprofit which focused on early childhood education (ECE), received an invitation from MIT’s Abdul Latif Jameel Poverty Action Lab (JPAL), a development research organization, to test its intervention for ECE with a... View Details
- August, 2022
- Article
Changing Ingroup Boundaries: The Effect of Immigration on Race Relations in the United States
By: Vasiliki Fouka and Marco Tabellini
How do social group boundaries evolve? Does the appearance of a new outgroup change the ingroup's perceptions of other outgroups? We introduce a conceptual framework of context-dependent categorization, in which exposure to one minority leads to recategorization of... View Details
- 2022
- Article
Nonparametric Subset Scanning for Detection of Heteroscedasticity
By: Charles R. Doss and Edward McFowland III
We propose Heteroscedastic Subset Scan (HSS), a novel method for identifying covariates that are responsible for violations of the homoscedasticity assumption in regression settings. Viewing the problem as one of anomalous pattern detection, we use subset scanning... View Details
- Article
Online Experimentation: Benefits, Operational and Methodological Challenges, and Scaling Guide
By: Iavor Bojinov and Somit Gupta
In the past decade, online controlled experimentation, or A/B testing, at scale has proved to be a significant driver of business innovation. The practice was first pioneered by the technology sector and, more recently, has been adopted by traditional companies... View Details
- 2022
- Working Paper
Pricing Power in Advertising Markets: Theory and Evidence
By: Matthew Gentzkow, Jesse M. Shapiro, Frank Yang and Ali Yurukoglu
Existing theories of media competition imply that advertisers will pay a lower price in equilibrium to reach consumers who multi-home across competing outlets. We generalize and extend this theoretical result and test it using data from television and social media... View Details
- 2022
- Article
How to Choose a Default
By: John Beshears, Richard T. Mason and Shlomo Benartzi
We have developed a model for setting a default when a population is choosing among ordered choices—that is, ones listed in ascending or descending order. A company, for instance, might want to set a default contribution rate that will increase employees’ average... View Details
- 2022
- Article
Values and Inequality: Prosocial Jobs and the College Wage Premium
By: Nathan Wilmers and Letian Zhang
Employers often recruit workers by invoking corporate social responsibility, organizational purpose, or other claims to a prosocial mission. In an era of substantial labor
market inequality, commentators typically dismiss these claims as hypocritical: prosocial... View Details
- May 2022
- Article
How Status of Research Papers Affects the Way They Are Read and Cited
By: Misha Teplitskiy, Eamon Duede, Michael Menietti and Karim R. Lakhani
Although citations are widely used to measure the influence of scientific works, research shows that many citations serve rhetorical functions and reflect little-to-no influence on the citing authors. If highly cited papers disproportionately attract rhetorical... View Details
Keywords: Metrics; Influence; Status; Citations; Science; Measurement and Metrics; Research; Perception
- April 2022
- Teaching Note
CVS Health: Prescription for Transformation
By: Rosabeth Moss Kanter and Catarina Martinez
In 2021, new CEO Karen Lynch (named the most powerful woman in business) considered the next transformation phase for CVS Health (a Fortune 5 corporate giant). The 2018 acquisition of Aetna insurance brought her to the company as part of its long evolution from a... View Details
Keywords: Health; COVID-19 Pandemic; Primary Care; Leadership; Change Management; Women Executives; Retail; Pharmacy; Pharmacy Benefit Manager; Clinical Trials; Vaccination; Acquisition; Innovation and Invention; Transformation; Retail Industry; Pharmaceutical Industry; Health Industry; United States
- April 2022
- Article
National Customer Orientation: A Framework, Propositions and Agenda for Future Research
By: Ofer Mintz, Imran S. Currim and Rohit Deshpandé
Purpose: This paper aims to propose a new country-level construct, national customer orientation, to provide a benchmark for global headquartered managers’ decisions and scholars investigating cross-national research.
Design/methodology/approach: A conceptual... View Details
Design/methodology/approach: A conceptual... View Details
- 2022
- Working Paper
Is Hybrid Work the Best of Both Worlds? Evidence from a Field Experiment
Hybrid work is emerging as a novel form of organizing work globally. This paper reports causal evidence on how the extent of hybrid work—the number of days worked from home relative to days worked from the office—affects work outcomes. Collaborating with an... View Details
- March 2022 (Revised July 2022)
- Technical Note
Statistical Inference
This note provides an overview of statistical inference for an introductory data science course. First, the note discusses samples and populations. Next the note describes how to calculate confidence intervals for means and proportions. Then it walks through the logic... View Details
- Article
From Immigrants to Americans: Race and Assimilation During the Great Migration
By: Vasiliki Fouka, Soumyajit Mazumder and Marco Tabellini
How does the arrival of a new minority group affect the social acceptance and outcomes of existing minorities? We study this question in the context of the First Great Migration. Between 1915 and 1930, 1.5 million African Americans moved from the U.S. South to Northern... View Details
- 2022
- Working Paper
Statistical Inference for Heterogeneous Treatment Effects Discovered by Generic Machine Learning in Randomized Experiments
By: Kosuke Imai and Michael Lingzhi Li
Researchers are increasingly turning to machine learning (ML) algorithms to investigate causal heterogeneity in randomized experiments. Despite their promise, ML algorithms may fail to accurately ascertain heterogeneous treatment effects under practical settings with... View Details