Mathias Fjællegaard Jensen

Mathias Fjællegaard Jensen

Senior Research Fellow

Department of Economics

University of Oxford

Biography

I am a Senior Research Fellow in the Department of Economics at the University of Oxford, and affiliated with Lady Margaret Hall, Nuffield College, CEPR, and IZA. I am an applied microeconomist working at the intersection of labour, public, and health economics. I am on the 2025-26 academic job market.

My research agenda has two strands. First, I study the parent–child relationship across three phases: the effects of childbirth, intergenerational dynamics across the life course, and the consequences when the relationship ends at parental death. Second, I examine how policy, labour market dynamics, and education contribute to heterogeneous outcomes in modern labour markets and in well-being more broadly.

My work has appeared in AEJ: Applied Economics, Journal of Public Economics, and AEA Papers and Proceedings, among others. I have one paper conditionally accepted and one under revise-and-resubmit at the American Economic Review. Since finishing my PhD in 2021, I have attracted and managed about £950k in research funding to Oxford, including an ESRC New Investigator grant (2025-2028).

I communicate research to broader audiences through policy briefs (e.g., VoxEU; IZA World of Labor) and direct engagement with business and policymakers (e.g., via OUBEP). My work has been featured in international media, including the New York Times and The Observer/Guardian.

In my job market paper, Intergenerational Mobility by Sexuality, we develop a population-scale approach to observing sexuality in administrative data – a dimension rarely observable in data sources linked across generations. This provides novel population-level evidence on intergenerational dynamics and outcomes by sexuality.

Please get in touch if you would like to talk research!


News

December 2025Effects of Parental Death on Labor Market Outcomes (with Ning Zhang) conditionally accepted at the American Economic Review.

November 2025 — Joined the Centre for Economic Policy Research (CEPR) as a Research Affiliate.


Interests

  • Applied Microeconomics
  • Labour, Public, and Health Economics
  • Intergenerational Mobility
  • Inequality

Education

  • PhD in Economics, 2021

    Copenhagen Business School

  • MSc in Business Administration & Philosophy, 2018

    Copenhagen Business School

  • MPhil in Multi-Disciplinary Gender Studies, 2016

    University of Cambridge

  • BA (Hons.) in Economics, 2015

    University of Cambridge

Working Papers

Intergenerational Mobility by Sexuality

Existing research documents substantial disparities in life outcomes between same-sex and different-sex attracted individuals, typically disadvantaging same-sex attracted individuals. We analyse how parental background relates to adult children’s earnings, health, fertility, and family formation by sexuality. To do so, we develop a new strategy to identify same-sex and different-sex couples in population-wide administrative data using joint financial commitments from Denmark. Our approach mitigates limitations associated with non-representative surveys and cross-sectional data on sexuality. Drawing on identity economics and minority stress theory, we propose a conceptual framework in which deviation from the social prescription of different-sex attraction generates identity costs that may decline with parental resources through reduced exposure to discrimination and enhanced coping capacity. Empirically, we find that disparities generally persist across the parental income distribution, though severe mental health conditions are particularly elevated among same-sex attracted individuals from low-income families. We explore parent-child relationships as potential mechanisms, finding that same-sex attracted individuals live farther from parents across the income distribution. Results are robust to controlling for unobserved parental heterogeneity through sibling fixed effects, but vary across childhood regions and cohorts. Our findings suggest that intergenerational mobility depends not only on factors shared by siblings but also on innate individual characteristics, such as sexuality.

Intergenerational Mobility of Immigrants in 15 Destination Countries

We estimate intergenerational mobility of immigrants and their children in fifteen receiving countries. We document large income gaps for first-generation immigrants that diminish in the second generation. Around half of the second-generation gap can be explained by differences in parental income, with the remainder due to differential rates of absolute mobility. The daughters of immigrants enjoy higher absolute mobility than daughters of locals in most destinations, while immigrant sons primarily enjoy this advantage in countries with long histories of immigration. Cross-country differences in absolute mobility are not driven by parental country-of-origin, but instead by destination labor markets and immigration policy.

Publications / accepted papers

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