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All HBS Web
(6,825)
- Faculty Publications (523)
Time Use →
- 2022
- Working Paper
Slowly Varying Regression under Sparsity
By: Dimitris Bertsimas, Vassilis Digalakis Jr, Michael Lingzhi Li and Omar Skali Lami
We consider the problem of parameter estimation in slowly varying regression models with sparsity constraints. We formulate the problem as a mixed integer optimization problem and demonstrate that it can be reformulated exactly as a binary convex optimization problem...
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Keywords:
Mathematical Methods
Bertsimas, Dimitris, Vassilis Digalakis Jr, Michael Lingzhi Li, and Omar Skali Lami. "Slowly Varying Regression under Sparsity." Working Paper, September 2022.
- August 2022
- Case
Atlanta Ransomware Attack (A)
By: Amit Goldenberg and Julian Zlatev
This case describes the March 2018 Ransomware attack on the information technology (IT) systems of the city of Atlanta and the response by Mayor Keisha Lance Bottoms and her administration. The case includes a brief background on Bottoms and her young administration at...
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Keywords:
Crime and Corruption;
Decision Making;
Cost vs Benefits;
Decision Choices and Conditions;
Decisions;
Ethics;
Values and Beliefs;
Government and Politics;
Government Administration;
Information Technology;
Cybersecurity;
Information Management;
Leadership;
Management;
Crisis Management;
Management Teams;
Negotiation;
Risk and Uncertainty;
Social Psychology;
Perception;
Personal Characteristics;
Perspective;
Power and Influence;
Society;
Public Administration Industry;
United States;
Georgia (state, US);
Atlanta
Goldenberg, Amit, and Julian Zlatev. "Atlanta Ransomware Attack (A)." Harvard Business School Case 923-009, August 2022.
- August 2022
- Supplement
Atlanta Ransomware Attack (B)
By: Amit Goldenberg and Julian Zlatev
This case describes the March 2018 Ransomware attack on the information technology (IT) systems of the city of Atlanta and the response by Mayor Keisha Lance Bottoms and her administration. The case includes a brief background on Bottoms and her young administration at...
View Details
Keywords:
Crime and Corruption;
Decision Making;
Cost vs Benefits;
Decision Choices and Conditions;
Decisions;
Ethics;
Values and Beliefs;
Government and Politics;
Government Administration;
Information Technology;
Cybersecurity;
Information Management;
Leadership;
Management;
Crisis Management;
Management Teams;
Negotiation;
Risk and Uncertainty;
Social Psychology;
Perception;
Personal Characteristics;
Perspective;
Power and Influence;
Society;
Public Administration Industry;
United States;
Atlanta;
Georgia (state, US)
Goldenberg, Amit, and Julian Zlatev. "Atlanta Ransomware Attack (B)." Harvard Business School Supplement 923-010, August 2022.
- 2022
- Working Paper
Private Equity Fund Valuation Management during Fundraising
By: Brian K. Baik
I investigate whether and how private equity fund managers (GPs) inflate their interim fund valuations (net asset values, or NAVs) during fundraising periods. Specifically, I study the extent to which the GPs inflate NAVs by managing valuation assumptions (e.g.,...
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Keywords:
Private Equity;
Institutional Investors;
Valuation Multiples;
Earnings Management;
Private Firms;
Valuation;
Investment Funds
Baik, Brian K. "Private Equity Fund Valuation Management during Fundraising." Harvard Business School Working Paper, No. 23-013, August 2022.
- 2022
- Working Paper
The Effect of Employee Lateness and Absenteeism on Store Performance
By: Caleb Kwon and Ananth Raman
We empirically analyze the effects of employee lateness and absenteeism on store performance by examining 25.5 million employee shift timecards covering more than 100,000 employees across more than 500 U.S. retail grocery store locations over a four year time period....
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Kwon, Caleb, and Ananth Raman. "The Effect of Employee Lateness and Absenteeism on Store Performance." Working Paper, August 2022.
- 2023
- Working Paper
Scapegoating and Discrimination in Times of Crisis: Evidence from Airbnb
By: Michael Luca, Elizaveta Pronkina and Michelangelo Rossi
We present evidence that discrimination against Asian-American Airbnb users sharply increased at the
start of the COVID-19 pandemic. Using a DiD approach, we find that hosts with distinctively Asian
names experienced a 20 percent decline in guests relative to hosts...
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Keywords:
Discrimination;
Behavioral Economics;
Market Design;
Health Pandemics;
Prejudice and Bias;
Digital Platforms;
Design
Luca, Michael, Elizaveta Pronkina, and Michelangelo Rossi. "Scapegoating and Discrimination in Times of Crisis: Evidence from Airbnb." Harvard Business School Working Paper, No. 23-012, August 2022. (Revised March 2023.)
- 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...
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Keywords:
Social Entrepreneurship;
Early Childhood Education;
Nonprofit Organizations;
Literacy;
Values and Beliefs;
Social and Collaborative Networks;
Education Industry;
India;
Asia
Trelstad, Brian, Tomas Rosales, and Malini Sen. "Rocket Learning: Evidence in Action." Harvard Business School Case 323-002, August 2022.
- August 2022
- Article
Availability of New Medicines in the U.S. and Germany From 2004 to 2018
By: Katharina Blankart, Huseyin Naci and Amitabh Chandra
Importance: Germany's unique approach to coverage determination and pricing has ensured that effective medicines remain on the market, often at prices reduced through negotiation. However, less is known about trade-offs of this approach with regard to initial...
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Keywords:
Market Entry and Exit;
Price;
Market Timing;
Governing Rules, Regulations, and Reforms;
Pharmaceutical Industry;
United States;
Germany
Blankart, Katharina, Huseyin Naci, and Amitabh Chandra. "Availability of New Medicines in the U.S. and Germany From 2004 to 2018." e2229231. JAMA Network Open 5, no. 8 (August 2022).
- July–August 2022
- Article
How Do Disadvantaged Groups Seek Information about Public Services? A Randomized Controlled Trial of Communication Technologies
By: Katerina Linos, Melissa Carlson, Laura Jakli, Nadia Dalma, Isabelle Cohen, Afroditi Veloudaki and Stavros Nikiforos Spyrellis
Governments and NGOs are switching to phone- and Internet-based communication technologies to reduce costs and broaden access to public services. However, these technological shifts can backfire if they exacerbate administrative burden in high-need communities. We...
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Linos, Katerina, Melissa Carlson, Laura Jakli, Nadia Dalma, Isabelle Cohen, Afroditi Veloudaki, and Stavros Nikiforos Spyrellis. "How Do Disadvantaged Groups Seek Information about Public Services? A Randomized Controlled Trial of Communication Technologies." Public Administration Review 82, no. 4 (July–August 2022): 708–720.
- 2023
- Working Paper
Dynamic Pricing, Intertemporal Spillovers, and Efficiency
By: Alexander J. MacKay, Dennis Svartbäck and Anders G. Ekholm
Pricing technology that allows firms to rapidly adjust prices has two potential benefits.
Time-varying prices can respond to high-frequency demand shocks to generate greater revenues,
and they can also be used to smooth out demand to reduce costs. Using data...
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MacKay, Alexander J., Dennis Svartbäck, and Anders G. Ekholm. "Dynamic Pricing, Intertemporal Spillovers, and Efficiency." Harvard Business School Working Paper, No. 23-007, July 2022. (Revised December 2023.)
- July 2022
- Case
General Mills: Responding to the Killing of George Floyd (A)
By: Debora L. Spar and Alicia Dadlani
Jeff Harmening, CEO of General Mills, one of the world's largest manufacturers of breakfast cereals and packaged foods, was deeply disturbed and instantly aware that he and General Mills would need to respond. George Floyd, an African-American man who had been accused...
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Keywords:
Race;
Decisions;
Social Issues;
Corporate Social Responsibility and Impact;
Consumer Products Industry;
Food and Beverage Industry;
Minneapolis;
Minnesota;
United States
Spar, Debora L., and Alicia Dadlani. "General Mills: Responding to the Killing of George Floyd (A)." Harvard Business School Case 323-019, July 2022.
- July 2022
- Supplement
General Mills: Responding to the Killing of George Floyd (B)
By: Debora L. Spar and Alicia Dadlani
Jeff Harmening, CEO of General Mills, one of the world's largest manufacturers of breakfast cereals and packaged foods, was deeply disturbed and instantly aware that he and General Mills would need to respond. George Floyd, an African-American man who had been accused...
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Keywords:
Race;
Decisions;
Social Issues;
Corporate Social Responsibility and Impact;
Consumer Products Industry;
Minneapolis;
Minnesota;
United States
Spar, Debora L., and Alicia Dadlani. "General Mills: Responding to the Killing of George Floyd (B)." Harvard Business School Supplement 323-020, July 2022.
- July 2022
- Article
Countercyclical Prudential Buffers and Bank Risk-taking
By: Manuel Illueca, Lars Norden, Joseph Pacelli and Gregory F. Udell
We investigate the effects of countercyclical prudential buffers on bank risk-taking. We exploit the introduction of dynamic loan loss provisioning in Spain, mandating that banks use historical average loss rates in their estimation of loan loss provisions. We find...
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Keywords:
Banks;
Bank Regulation;
Macroprudential Policies;
Bank Lending;
Loan Loss Provisioning;
Risk Taking;
Banks and Banking;
Financing and Loans;
Governing Rules, Regulations, and Reforms;
Risk and Uncertainty
Illueca, Manuel, Lars Norden, Joseph Pacelli, and Gregory F. Udell. "Countercyclical Prudential Buffers and Bank Risk-taking." Art. 100961. Journal of Financial Intermediation 51 (July 2022).
- 2022
- Working Paper
Hidden Alpha
By: Lauren Cohen, Manuel Amman, Alexander Cochardt and Stephan Heller
Using the setting of financial agents, we explore the importance of hidden connections relative
to all other network connections. We find that hidden connections are those associated with
the largest and most significant abnormal returns accruing to fund managers—on...
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- Article
Multitasking While Driving: A Time Use Study of Commuting Knowledge Workers to Assess Current and Future Uses
By: Thomaz Teodorovicz, Andrew L. Kun, Raffaella Sadun and Orit Shaer
Commuting has enormous impact on individuals, families, organizations, and society. Advances in vehicle automation may help workers employ the time spent commuting in productive work-tasks or wellbeing activities. To achieve this goal, however, we need to develop a...
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Keywords:
In-vehicle User Interfaces;
Time-use Study;
Automated Vehicles;
Knowledge Workers;
Commuting
Teodorovicz, Thomaz, Andrew L. Kun, Raffaella Sadun, and Orit Shaer. "Multitasking While Driving: A Time Use Study of Commuting Knowledge Workers to Assess Current and Future Uses." International Journal of Human-Computer Studies 162 (June 2022).
- June 2022
- Article
The Welfare Effects of Peer Entry in the Accommodation Market: The Case of Airbnb and the Accommodation Industry
By: Chiara Farronato and Andrey Fradkin
We study the effects of enabling peer supply through Airbnb in the accommodation industry. We present a model of competition between flexible and dedicated sellers—peer hosts and hotels—who provide differentiated products. We estimate this model using data from major...
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Keywords:
Peer To Peer;
Airbnb;
Digital Platforms;
Market Entry and Exit;
Competition;
Accommodations Industry
Farronato, Chiara, and Andrey Fradkin. "The Welfare Effects of Peer Entry in the Accommodation Market: The Case of Airbnb and the Accommodation Industry." American Economic Review 112, no. 6 (June 2022): 1782–1817.
- March 22, 2022
- Article
The Great Resignation or the Great Rethink?
By: Ranjay Gulati
Unsettled by the pandemic, most people are considering our jobs with fresh perspective. Some are quitting, in what has been dubbed the Great Resignation. But, for many, it’s more of a Great Rethink. Do we really like our employers’ culture? Do we feel that we’re fairly...
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Gulati, Ranjay. "The Great Resignation or the Great Rethink?" Harvard Business Review (website) (March 22, 2022).
- May 2022
- Article
The Impact of COVID-19 on Digital Communication Patterns
By: Evan DeFilippis, Stephen Michael Impink, Madison Singell, Jeff Polzer and Raffaella Sadun
We explore the impact of COVID-19 on employees’ digital communication patterns through an event study of lockdowns in 16 large metropolitan areas in North America, Europe, and the Middle East. Using de-identified, aggregated meeting and email meta-data from 3,143,270...
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Keywords:
Meetings;
Email;
COVID-19 Pandemic;
Communication Technology;
Health Pandemics;
Time Management
DeFilippis, Evan, Stephen Michael Impink, Madison Singell, Jeff Polzer, and Raffaella Sadun. "The Impact of COVID-19 on Digital Communication Patterns." Humanities and Social Sciences Communications 9, no. 180 (May 2022).
- 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...
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Keywords:
Metrics;
Influence;
Status;
Citations;
Science;
Measurement and Metrics;
Research;
Perception
Teplitskiy, Misha, Eamon Duede, Michael Menietti, and Karim R. Lakhani. "How Status of Research Papers Affects the Way They Are Read and Cited." Research Policy 51, no. 4 (May 2022).
- April 12, 2022
- Article
Evaluation of Individual and Ensemble Probabilistic Forecasts of COVID-19 Mortality in the United States
By: Estee Y. Cramer, Evan L. Ray, Velma K. Lopez, Johannes Bracher, Andrea Brennen, Alvaro J. Castro Rivadeneira, Michael Lingzhi Li and et al.
Short-term probabilistic forecasts of the trajectory of the COVID-19 pandemic in the United States have served as a visible and important communication channel between the scientific modeling community and both the general public and decision-makers. Forecasting models...
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Keywords:
COVID-19;
Forecasting and Prediction;
Health Pandemics;
Mathematical Methods;
Partners and Partnerships
Cramer, Estee Y., Evan L. Ray, Velma K. Lopez, Johannes Bracher, Andrea Brennen, Alvaro J. Castro Rivadeneira, Michael Lingzhi Li, and et al. "Evaluation of Individual and Ensemble Probabilistic Forecasts of COVID-19 Mortality in the United States." e2113561119. Proceedings of the National Academy of Sciences 119, no. 15 (April 12, 2022). (See full author list here.)