Research

Research by Sébastien Lamproye on market power, production networks, platforms, innovation, and welfare.

Job Market Paper

Draft in progress

Market Power and Firm-Level Welfare Incidence

Sébastien Lamproye

Which firms account for the welfare cost of market power? This paper develops a firm-level welfare-incidence measure for markup dispersion. The measure maps firm markups, size, sectoral demand curvature, and benchmark markups into the change in aggregate welfare generated by reducing an individual firm’s markup gap. I implement the framework using Belgian firm-level accounting data from 1980 to 2024.

Draft will be updated before circulation

Working Papers

Working paper

Aggregating Markups in Production Networks

with Emmanuel Dhyne (National Bank of Belgium and University of Mons)

How should firm-level markups be aggregated when production takes place through input–output networks? We derive an aggregate markup consistent with household incidence and show how cost-based exposure weights trace distortions through the production network. We bring the framework to near-universe Belgian firm-to-firm data.

Working paper

Market Power and Firm-Level Welfare Impact in Production Networks

with Emmanuel Dhyne (National Bank of Belgium and University of Mons)

Which firms matter most for the welfare cost of market power in a production network? We map firm-level markups and firm-to-firm linkages into aggregate welfare losses and firm-level welfare effects, then implement the framework using Belgian administrative transaction data.

Under Review

Under review

Technological Knowledge Intensity and Intergenerational Mobility across U.S. Regions

Sébastien Lamproye

This paper studies the regional relationship between technological knowledge intensity and intergenerational upward mobility in the United States. Combining mobility measures from the Opportunity Atlas with U.S. patent records, I document that regions with greater patent-based knowledge intensity exhibit higher upward mobility.

Policy Publication

European Economy Discussion Paper

Are We More Accurate? Revisiting the European Commission’s Macroeconomic Forecasts

with Andras Chabin and Milan Výškrabka

This paper reassesses the accuracy of the European Commission’s macroeconomic forecasts and studies how forecast performance has evolved over time.

Official publication European Economy Discussion Paper 128 · 2020

Work in Progress

When Comparison Makes Markets Tip

with Duy-Anh Phan (Monash University)

Correction for Guessing as Information Revelation

with Michał Kobielarz (KU Leuven) and Johannes Van Biesebroeck (KU Leuven)

Contracts, Corruption, and Relocation: A Theory of Carbon Leakage

with Duy-Anh Phan (Monash University)

Patents, Diffusion, and the Gap Between Discovery and Use

with Tselmuun Tserenkhuu (Osaka University)