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- Article
Faith and Assimilation: Italian Immigrants in the U.S.
By: Stefano Gagliarducci and Marco Tabellini
How do ethnic religious organizations influence immigrant assimilation? To answer this question, we assemble novel data from the Catholic directories to measure the presence of Italian Catholic churches in the US between 1890 and 1920, when four million Italians moved... View Details
- July 2025
- Article
Economic Integration and the Transmission of Democracy
By: Marco Tabellini and Giacomo Magistretti
In this paper, we study the effects of economic integration with democratic partners on democracy. We assemble a large country-level panel dataset from 1960 to 2015, and exploit improvements in air, relative to sea, transportation to derive a time-varying instrument... View Details
- June 2025
- Case
Crossing Borders, Dividing Politics: U.S. Immigration Policy and Political Polarization
By: Marco Tabellini and Alexis Lefort
This case explores the history and political dynamics of U.S. immigration policy, focusing on its evolution from the 18th century to 2025. It traces key legislative milestones, such as the 1965 Immigration and Nationality Act, DACA, and the 2025 Laken Riley Act,... View Details
- June 2025
- Article
Passive Ownership and Price Informativeness
By: Marco Sammon
I show that passive ownership negatively affects the degree to which stock prices anticipate earnings announcements. Estimates across several research designs imply that the rise in passive ownership over the last 30 years has caused the amount of information... View Details
Keywords: Passive Ownership; ETFs; Market Efficiency; Price; Investment Funds; Stocks; Communication
- Working Paper
Index Rebalancing and Stock Market Composition: Do Indexes Time the Market?
By: Marco Sammon and John J. Shim
Value-weighted indexes must rebalance in response to stock market composition changes, e.g., issuance, buybacks, and IPOs. In doing so, existing index funds implicitly engage in market timing. Index funds’ long-short rebalancing portfolios have a -3.5% annual return... View Details
- 2025
- Working Paper
Extractive Taxation and the French Revolution
By: Tommaso Giommoni, Gabriel Loumeau and Marco Tabellini
We study the fiscal determinants of the French Revolution, exploiting plausibly exogenous variation in the salt tax—a large source of royal revenues and one of the most extractive forms of taxation of the Ancien Régime. Implementing a Regression Discontinuity... View Details
- January 2025 (Revised February 2025)
- Teaching Note
Population Aging in the U.S.: Is America Ready for the 'Silver Tsunami?'
By: Marco Tabellini
Teaching Note for HBS Case No. 725-027. View Details
- January 2025 (Revised February 2025)
- Case
Population Aging in the U.S.: Is America Ready for the 'Silver Tsunami?'
By: Marco Tabellini
- November 2024
- Teaching Note
The Marshall Plan: The Politics and Economics of Europe's Recovery After World War II
By: Vincent Pons, Marco Tabellini and Vestal McIntyre
- 2024
- Working Paper
Categorical Processing in a Complex World
By: Marco Sammon, Thomas Graeber and Christopher Roth
In real-world news environments, quantitative information is rarely presented in isolation; it is characterized through qualitative comparisons with various reference levels. Company earnings, for example, are commonly compared to analyst forecasts, previous earnings,... View Details
- Fall, 2024
- Article
Sixty Years of the Voting Rights Act: Progress and Pitfalls
By: Andrea Bernini, Giovanni Facchini, Marco Tabellini and Cecilia Testa
We review the literature on the effects of the 1965 Voting Rights Act (VRA), which removed formal restrictions to Black political participation. After a brief description of racial discrimination suffered by Black Americans since Reconstruction, we introduce the goals... View Details
- September 2024 (Revised March 2025)
- Case
Burn the Gondolas? Venice, the Ghetto, and the Seasons of Capitalism
By: Sophus A. Reinert, Charlotte Robertson and Robert Fredona
This case uses the history of Venice—from the driving of the first pylons in the lagoon to the abdication of the city’s last doge, across the ages of Marco Polo and Vivaldi—to explore the invention and global diffusion of capitalism, as well as the cyclical rise and... View Details
- 2024
- Working Paper
Primary Capital Market Transactions and Index Funds
By: Marco Sammon and Chris Murray
We document the effects of mechanical buying by CRSP-index-tracking funds on post-IPO returns and IPO deal structure. Leveraging a difference-in-differences-style design built on a 2017 CRSP rule change, we find that expected index fund demand leads fast track IPOs to... View Details
- June, 2024
- Book Review
Debunking Immigration Myths: A Review Essay of 'Streets of Gold: America’s Untold Story of Immigrant Success' (PublicAffairs, 2022) by Ran Abramitzky and Leah Boustan
By: Marco Tabellini
This essay reviews Streets of Gold: America’s Untold Story of Immigrant Success by Ran Abramitzky and Leah Boustan. This elegantly written book, highly accessible to both economists and non-economists, is a must-read for anyone interested in the topic of... View Details
- March 2024 (Revised February 2025)
- Case
The Marshall Plan: The Politics and Economics of Europe's Recovery After World War II
By: Vincent Pons, Marco Tabellini and Vestal McIntyre
- March 2024 (Revised February 2025)
- Case
South Africa: Growth and Inequality
- March 2024
- Article
The Political Effects of Immigration: Culture or Economics?
By: Alberto Alesina and Marco Tabellini
We review the growing literature on the political economy of immigration. First, we discuss the effects of immigration on a wide range of political and social outcomes. The existing evidence suggests that immigrants often, but not always, trigger backlash, increasing... View Details
- 2023
- Working Paper
Do Active Funds Do Better in What They Trade?
By: Marco Sammon and John J. Shim
We develop two new, simple measures to quantify active fund decisions at the individual position level. The intuition is to separate passive rebalancing induced by flows and position changes from active rebalancing decisions. We find that additive active rebalancing --... View Details
- 2024
- Working Paper
Migration, Climate Similarity, and the Consequences of Climate Mismatch
By: Marguerite Obolensky, Marco Tabellini and Charles Taylor
This paper examines the concept of “climate matching” in migration—the idea that migrants seek out destinations with familiar climates. Focusing on the US, we document that temperature distance between origin and destination predicts the distribution of migrants across... View Details
Keywords: Migration; Climate; Immigration; Residency; Weather; Ethnicity; Climate Change; Geographic Location; Policy; United States
- 2023
- Working Paper
Firm Purpose and Problem Wickedness: A Review of the Academic Literature
By: Caroline Adelson, Charlotte Kuller, Cate Tompkins, Ellora Sarkar, Samantha Price and Marco Iansiti
Our understanding of the firm’s role in society has evolved greatly over the past 70 years, with more recent years seeing a sharp rise in interest for how firms can contribute more than profits to society – that is, have a purpose beyond profits. Businesses engaged in... View Details