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- December 2024
- Article
Proximate (Co-)Working: Knowledge Spillovers and Social Interactions
By: Maria P. Roche, Alexander Oettl and Christian Catalini
We examine the influence of physical proximity on between-start-up knowledge spillovers at one of the largest technology coworking hubs in the United States. Relying on the exogenous assignment of office space to the hub’s 251 start-ups, we find that proximity... View Details
- July 2023
- Article
Takahashi-Alexander Revisited: Modeling Private Equity Portfolio Outcomes Using Historical Simulations
By: Dawson Beutler, Alex Billias, Sam Holt, Josh Lerner and TzuHwan Seet
In 2001, Dean Takahashi and Seth Alexander of the Yale University Investments Office developed a deterministic model for estimating future cash flows and valuations for the Yale endowment’s private equity portfolio. Their model, which is simple and intuitive, is still... View Details
- 2023
- Working Paper
Evaluation and Learning in R&D Investment
By: Alexander P. Frankel, Joshua L. Krieger, Danielle Li and Dimitris Papanikolaou
We examine the role of spillover learning in shaping the value of exploratory versus incremental
R&D. Using data from drug development, we show that novel drug candidates generate more
knowledge spillovers than incremental ones. Despite being less likely to reach... View Details
- May 2023
- Article
Self-Preferencing at Amazon: Evidence from Search Rankings
By: Chiara Farronato, Andrey Fradkin and Alexander MacKay
We study whether Amazon engages in self-preferencing on its marketplace by favoring its own brands (e.g., Amazon Basics) in search. To address this question, we collect new micro-level consumer search data using a custom browser extension installed by a panel of study... View Details
- Article
Recovering Investor Expectations from Demand for Index Funds
By: Mark Egan, Alexander J. MacKay and Hanbin Yang
We use a revealed-preference approach to estimate investor expectations of stock market returns. Using data on demand for index funds that follow the S&P 500, we develop and estimate a model of investor choice to flexibly recover the time-varying distribution of... View Details
- March 2022
- Article
Where to Locate COVID-19 Mass Vaccination Facilities?
By: Dimitris Bertsimas, Vassilis Digalakis Jr, Alexander Jacquillat, Michael Lingzhi Li and Alessandro Previero
The outbreak of COVID-19 led to a record-breaking race to develop a vaccine. However, the limited vaccine capacity creates another massive challenge: how to distribute vaccines to mitigate the near-end impact of the pandemic? In the United States in particular, the new... View Details
- 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
- January 2021
- Article
Chain Stability in Trading Networks
By: John William Hatfield, Scott Duke Kominers, Alexandru Nichifor, Michael Ostrovsky and Alexander Westkamp
We show that in general trading networks with bilateral contracts, a suitably adapted chain stability concept (Ostrovsky, 2008) is equivalent to stability (Hatfield and Kominers, 2012; Hatfield et al., 2013) if all agents' preferences are fully substitutable and... View Details
- June 2021
- Article
From Predictions to Prescriptions: A Data-driven Response to COVID-19
By: Dimitris Bertsimas, Léonard Boussioux, Ryan Cory-Wright, Arthur Delarue, Vassilis Digalakis Jr, Alexander Jacquillat, Driss Lahlou Kitane, Galit Lukin, Michael Lingzhi Li, Luca Mingardi, Omid Nohadani, Agni Orfanoudaki, Theodore Papalexopoulos, Ivan Paskov, Jean Pauphilet, Omar Skali Lami, Bartolomeo Stellato, Hamza Tazi Bouardi, Kimberly Villalobos Carballo, Holly Wiberg and Cynthia Zeng
The COVID-19 pandemic has created unprecedented challenges worldwide. Strained healthcare providers make difficult decisions on patient triage, treatment and care management on a daily basis. Policy makers have imposed social distancing measures to slow the disease, at... View Details
- December 2020
- Teaching Plan
Scaling Well by Doing Good: Motivating Talent at b.good
By: Francesca Gino, Gary P. Pisano and Alexander Rohe
- 2023
- Working Paper
When Should Public Programs Be Privately Administered? Theory and Evidence from the Paycheck Protection Program
By: Alexander Bartik, Zoë B. Cullen, Edward L. Glaeser, Michael Luca, Christopher Stanton and Adi Sunderam
What happens when public resources are allocated by private companies whose objectives may be
imperfectly aligned with policy goals? We study this question in the context of the Paycheck
Protection Program (PPP), which relied on private banks to disburse aid to small... View Details
- 2021
- Working Paper
Recovering Investor Expectations from Demand for Index Funds
By: Mark Egan, Alexander J. MacKay and Hanbin Yang
We use a revealed-preference approach to estimate investor expectations of stock market returns. Using data on demand for index funds that follow the S&P 500, we develop and estimate a model of investor choice to flexibly recover the time-varying distribution of... View Details
- December 2019
- Case
Steemit: A New Social Media?
By: Ramon Casadesus-Masanell, Alexander White and Karen Elterman
This case discusses the alternative social media site Steemit, including the principles it was founded on in 2016 and the challenges it faced in 2019. Steemit was a blockchain-based platform that aimed to differentiate itself from other social media companies by... View Details
Keywords: Decision Making; Decisions; Voting; Economic Systems; Money; Fairness; Values and Beliefs; Goals and Objectives; Digital Platforms; Product Design; Design; Problems and Challenges; Network Effects; Motivation and Incentives; Social and Collaborative Networks; Reputation; Business Strategy; Competition; Internet and the Web; Social Media; Entertainment and Recreation Industry; United States; Virginia; New York (city, NY)
- May 2019 (Revised May 2020)
- Case
fidentiaX: The Tradable Insurance Marketplace on Blockchain
By: Alexander Braun, Lauren H. Cohen and Jiahua Xu
Three years ago, Alvin Ang and his partner founded fidentiaX in Singapore, with the ambition to create the world’s first marketplace for tradable insurance policies on blockchain. With a 26-page white paper, the start-up closed a successful fundraising round through an... View Details
- June 2018
- Background Note
Introduction to Life Settlements
By: Alexander Braun, Lauren H. Cohen, Christopher J. Malloy and Jiahua Xu
Life insurance is an asset owned by the majority of American adults (61%). Note that this 61% penetration rate is essentially at parity with home ownership (64%) and higher than that of 401(k) retirement account ownership (53%). Life settlements, or life insurance... 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
- May 2018 (Revised June 2018)
- Case
Ashar Group: Brokers and Co-opetition in the Life Settlement Industry
By: Alexander Braun, Lauren H. Cohen, Christopher J. Malloy and Jiahua Xu
Connecting life insurance policyholders with potential investors (called Life Settlement Providers), Ashar Group plays a pivotal role in the industry. Its current position is, however, increasingly being challenged by consumer-direct models, led by major providers... View Details
- Article
An Invitation to Market Design
By: Scott Duke Kominers, Alexander Teytelboym and Vincent P. Crawford
Market design seeks to translate economic theory and analysis into practical solutions to real-world problems. By redesigning both the rules that guide market transactions and the infrastructure that enables those transactions to take place, market designers can... View Details
Keywords: Matching; Trading; Scrip; Liquidity; Efficiency; Equity; Allocation Rules; Marketplaces; Market Design; Marketplace Matching; Auctions
- 2016
- Working Paper
Refugee Resettlement
By: David Delacretaz, Scott Duke Kominers and Alexander Teytelboym
Over 100,000 refugees are permanently resettled from refugee camps to hosting
countries every year. Nevertheless, refugee resettlement processes in most countries
are ad hoc, accounting for neither the priorities of hosting communities nor the preferences of refugees... View Details
- August 2016
- Teaching Note
The Role of Real Estate in Endowment Portfolios: The Case of Christ Church College
By: Arthur I. Segel and Alexander W. Schultz
The case centers on Christ Church’s Treasurer, James Lawrie, who is contemplating his options for investing a portion of the College’s endowment in real estate. Approximately 1/3 of the total $690 million endowment was allocated towards real estate, much higher than... View Details