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Humboldt-Universität zu Berlin - Faculty of Life Sciences - Resource Economics

Dr. Achim Hagen


Achim Hagen
Photo: Achim Hagen


Research Interests



  • International Environmental Agreements
  • Game Theory
  • Polycentric Climate Governance
  • Biodiversity Conservation

Room: 1.23
Phone: +49-30-2093-46376
Fax:     +49-30-2093-46361



Academic Career

10/2018   PhD, Humboldt-Universität zu Berlin (summa cum laude). Thesis title: Global Climate Policy Beyond Nation-State Actors: An Economic Analysis of Environmental Cooperation.
since 2016  

Research Assistant, Resource Economics Group, Humboldt-Universität zu Berlin

since 2014  

Research Assistant, Research Group Environment and Development Economics, Carl von Ossietzky University Oldenburg


Member of the Knowledge Integration Unit Support Team of the Global TraPs project, facilitation of the dialogue-session „The Role of Subsidies in Sustainable Phosphorus Management“ at the 1st Global TraPs World Conference in Beijing


Master of Arts in Sustainability Economics and Management at the Carl von Ossietzky University of Oldenburg  and the Université Nice Sophia-Antipolis


Bachelor of Science in Environmental Sciences/ Economic Sciences at the Leuphana University Lüneburg


Selected Publications

Hagen, A., P. von Mouche, and H. P. Weikard (2020). The Two-Stage Game Approach to Coalition Formation: Where We Stand and Ways to Go. Games 11(1), 3. https://doi.org/10.3390/g11010003.

Hagen, Achim, and Klaus Eisenack. 2019. “Climate Clubs Versus Single Coalitions: The Ambitions of International Environmental Agreements.” Climate Change Economics 10 (3). https://doi.org/10.1142/S2010007819500118.

Roggero, Matteo, Leonhard Kähler and Achim Hagen. 2019. Strategic cooperation for transnational adaptation: lessons from the economics of climate change mitigation. International Environmental Agreements: Politics, Law and Economics. https://doi.org/10.1007/s10784-019-09442-x.

Hagen, A. and C. Roolfs (2019) Self-Enforcing Environmental Federations. PET 2019 conference paper.

Hagen, A. and J. Schneider (2017) Boon or Bane? Trade Sanctions and the Stability of International Environmental Agreements, Oldenburg Discussion Papers in Economics V-403-17, Carl von Ossietzky University Oldenburg, Germany.

Hagen, A., L. Kähler and K. Eisenack (2017) Transnational Environmental Agreements with Heterogeneous Actors, In S. Çağatay (ed.) Economics of International Environmental Agreements: a Critical Approach, Routledge.

Hagen, A., J.-C. Altamirano-Cabrera and H.-P. Weikard (2016) The Influence of Political Pressure Groups on the Stability of International Environmental Agreements, Oldenburg Discussion Papers in Economics V-391-16, Carl von Ossietzky University Oldenburg, Germany.


Complete CV including publication list (pdf)



Carl von Ossietzky Universität Oldenburg

  • Research Project: Polycentric Climate Governance (2015-2016)
  • Microeconomic Foundations of Environmental and Resource Economics (2014-2016)
  • Tutorial Resource Economics (2014-2015)


Other Activities

  • Consultancy for the European Court of Auditors