Josué Ortega
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I am a Senior Lecturer in Economics at Queen's University Belfast, specializing in market design.
I have published in Games and Economic Behavior, the Journal of Mathematical Economics, and Social Choice and Welfare. My research has been covered by The Economist, The Financial Times, MIT Technology Review, BBC's Thinking Allowed, and Forbes.
I obtained my PhD from the University of Glasgow, advised by Hervé Moulin.
I sit on the program committees of the Economics and Computation Conference (2023–2025), the Matching in Practice Workshop (2022 & 2024), the Royal Economic Society Conference (2024) and the Symposium on Algorithmic Game Theory (2025).
News: I am excited about a series of papers studying which students can improve their Deferred Acceptance placements by trading cycles, comments welcome!
Identifying and Quantifying Unimprovable Students, with G. Ziegler, P. Aribillaga and G. Zhao
[slides]
What Stable-Dominating Mechanisms Cannot Fix, with G. Ziegler, P. Aribillaga and G. Zhao
Publications
Publications
1. School choice with independent versus consolidated districts
Games and Economic Behavior (2024) with T. Klein and R. Aue,
2. The cost of strategy-proofness in school choice
Games and Economic Behavior (2023) with T. Klein,
-> extended abstract in the Matching under Preferences Workshop.
3. Fair cake-cutting in practice
Games and Economic Behavior (2022) with M. Kyropoulou and E. Segal-Halevi,
-> extended abstract in the Conference on Economics and Computation.
4. Obvious manipulations in cake-cutting
Social Choice and Welfare (2022) with E. Segal-Halevi.
5. On the integration of Shapley-Scarf housing markets
Journal of Mathematical Economics (2022) with K. Manocha and R. Kumar,
-> extended abstract in the Symposium on Algorithmic Game Theory.
6. Efficiency and fairness in cake-cutting with single-peaked preferences
Economics Letters (2020) with B. Bhardwaj and R. Kumar
7. Multi-unit assignment under dichotomous preferences
Mathematical Social Sciences (2020).
8. The losses from integration in matching markets can be large
Economics Letters (2019)
9. Equality of opportunity and integration in social networks
Physica A: Statistical Mechanics and its Applications (2019)
10. Social integration in two-sided matching markets
Journal of Mathematical Economics (2018)
Working Papers and Projects
Working Papers and Projects
Identifying and Quantifying Unimprovable Students, with G. Ziegler, P. Aribillaga and G. Zhao [slides]
Previously circulated as Unimprovable students and inequality in school choice
What Stable-Dominating Mechanisms Cannot Fix, with G. Ziegler, P. Aribillaga and G. Zhao
Improvable students in school choice, w. T Knipe
The limits of school choice with consent, with G. Ziegler
-> extended abstract in the Conference on Web and Internet Economics.
Experimental school choice with parents as subjects [slides]
Appeals in school choice [slides]
Refereeing and Editorial Activities
Refereeing and Editorial Activities
Program Committee:
Conference on Economics and Computation (EC); 2023, 2024, 2025.
Matching under Preferences workshop (Match-UP); 2022, 2024.
Symposium on Algorithmic Game Theory (SAGT); 2025.
Royal Economic Society Conference; 2024.
Irish Economic Society Conference; 2025.
Journals: Journal of Economic Theory, Theoretical Economics, Management Science, AEJ Microeconomics, Games and Economic Behavior, European Economic Review, Journal of Mathematical Economics, Social Choice and Welfare, Economics Letters, International Journal of Game Theory, Economic Inquiry, Theory and Decision, Social Networks, Mathematical Social Sciences, Journal of Demographic Economics, Stochastic Systems.
Other Conferences: EC 2020, WINE 2018, 3rd, 4th, 5th and 6th Games, Agents & Incentives Workshop.
Co-Chair: Irish Economic Theory network.
Others
Others
PhD Students
Taylor Knipe, (2024 - present), funded by the Northern Ireland Department of Economy.
Conferences Organised
Irish economic society conference, Belfast 2025.
Irish economic theory workshop, Belfast 2024.
Easter workshop on school choice, Belfast 2022.
15th matching in practice workshop, Mannheim 2018.
Awards and Grants
As PI:
ESRC Impact Acceleration (£24,400).
British Academy small grant (£10,000).
Seal of Excellence for Marie Curie fellowship (€162,806).
As co-PI:
Design and impact of admissions rules for schools, Leibniz Association (€330,000).
Improving school admissions for diversity, Leibniz Association (€340,000).
Internal Grants:
North America Research Mobility Fund, QUB Faculty Research Initiatives Fund, EssexLab Seedcorn Fund Grant, Glasgow - Columbia Principal's Early Career Mobility Fund.
Awards:
Early Career Mathematician Prize for the best article in Mathematics Today in 2016
Queen’s Management School Research Innovation Prize.
Personal
Personal
Mexican and British citizen.
Address: Office 02.021, Riddel Hall Block 3, 185 Stranmillis Rd, Belfast BT9 5EE
Interests: football, latin-american literature, guitars, coffee.
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