Dr. Johannes
Ziesmer.

Agricultural economics
& computational modelling

Publications & presentations

Methods & applications

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The selected papers below cover policy modelling, uncertainty, and collective choice. The full list also includes reports and presentations. You can find my work on Google Scholar and ORCID.

Selected publications

Full publication & presentation list

Earlier publications and presentations appear under my former name, Johannes Hedtrich.

Journal articles

  1. Michael H. Grunenberg, Christian H. C. A. Henning, and Johannes Ziesmer (2026).

    Macht Wissen Politik? Muster und Determinanten des Informational Lobbyings in der deutschen Tierwohlpolitik

    Zeitschrift für Vergleichende Politikwissenschaft, 20, Article 2.

  2. Johannes Ziesmer (2024).

    Identifying key sectors of sustainable development: A Bayesian framework estimating policy‐impacts in a general equilibrium

    Agribusiness, 40(2), 458-483.

  3. Malte Braack, Christian Henning, and Johannes Ziesmer (2024).

    Pure strategy Nash equilibria for bargaining models of collective choice

    International Journal of Game Theory, 53, 373-421.

  4. Johannes Ziesmer, Ding Jin, Sneha D. Thube, and Christian Henning (2023).

    A Dynamic Baseline Calibration Procedure for CGE models

    Computational Economics, 61, 1331-1368.

  5. Johannes Ziesmer, Ding Jin, Askar Mukashov, and Christian Henning (2023).

    Integrating fundamental model uncertainty in policy analysis: A Bayesian averaging approach combining CGE-models with metamodeling techniques

    Socio-Economic Planning Sciences, 87, Article 101591.

  6. Christian Henning, Christian Aßmann, Johannes Hedtrich, Julian Ehrenfels, and Eva Krampe (2019).

    What drives participatory policy processes: Grassroot activities, scientific knowledge or donor money? A comparative policy network approach

    Social Networks, 58, 78-104.

  7. Christian H. C. A. Henning, Nana Zarnekow, Johannes Hedtrich, Sascha Stark, Kathrin Türk, and Matthias Laudes (2014).

    Identification of direct and indirect social network effects in the pathophysiology of insulin resistance in obese human subjects

    PLoS ONE, 9(4), e93860.

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Work in progress

  1. Ding Jin and Johannes Ziesmer.

    A comparison of metamodeling techniques for the simulation of CGE model outputs

    Ongoing research.

  2. Christian Henning, Ding Jin, Sonja Peterson, and Johannes Ziesmer.

    Global trade networks as a commitment device in international climate policy? – a metamodeling approach assessing multi-layer trade networks as determinants of abatement cost spillovers of national carbon emission reductions

    Revision under review at Computational Economics.

  3. Johannes Ziesmer, Christian Henning, and Ousmane Badiane (2026).

    Institutional foundations of evidence-based and participatory policy processes in Africa: Empirical application to the CAADP process

    Contribution to ATOR 2026.

  4. Christian Henning, Sonja Peterson, and Johannes Ziesmer.

    International Bargaining on Moral Values in Climate Clubs

    Ongoing research.

  5. Christian Henning, Mihaly Himics, Lea Panknin, Peter Witzke, and Johannes Ziesmer.

    The F2F strategy in the EU Green Deal – An optimal implementation?

    Ongoing research.

  6. Malte Braack, Christian Henning, and Johannes Ziesmer.

    Where Banzhaf Meets Nash and Black: A Legislative Bargaining Foundation of a Generalized Banzhaf Value

    Ongoing research.

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Book chapters & proceedings

  1. Bernd Überschär, Christian Henning, and Johannes Ziesmer (2026).

    Aquaponic Systems for Small-Scale Farming in Africa: Potential and Challenges

    Moving the Technology Frontiers in African Agrifood Systems. ReSAKSS 2025 Annual Trends and Outlook Report.

  2. Frits K. van Evert, Khadim Dia, Pepijn A. J. van Oort, Christian Henning, and Johannes Ziesmer (2026).

    From Innovation to Impact: Exploring the Economic Potential of Digital Twins in European and African Agriculture

    Moving the Technology Frontiers in African Agrifood Systems. ReSAKSS 2025 Annual Trends and Outlook Report.

  3. Johannes Hedtrich, Ekaterina Fabritz, Christian Henning, and Bernhard Thalheim (2018).

    Digital playground for policy decision making

    DAMDID/RCDL 2018 · CEUR Workshop Proceedings 2277, pp. 174–180.

  4. Christian Henning and Johannes Hedtrich (2018).

    Modeling and evaluation of political processes: A new quantitative approach

    Development Policies and Policy Processes in Africa · Springer.

  5. Christian Henning, Johannes Hedtrich, Ligane Massamba Sène, and Eva Krampe (2018).

    Whither participation? Evaluating participatory policy processes using the CGPE approach: The case of CAADP in Malawi

    Development Policies and Policy Processes in Africa · Springer.

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Technical reports, policy briefs & working papers

  1. Christian Henning, Johannes Ziesmer, Mahamadou Tankari, Henry Okodua, Moustapha Pene, Mouhamadou Hady Diallo, Paul Guthiga, and Julia Collins (2026).

    Policy and Investment Priorities for Advancing the Kampala CAADP Goals and Target Commitments in Kenya

    Kampala CAADP Series, Country Diagnostics Brochure · 1 · AKADEMIYA2063.

  2. Christian H. C. A. Henning, Mahamadou Tankari, and Johannes Ziesmer (2025).

    Enhancing the Effectiveness and Impacts of Public Agricultural Expenditure under CAADP

    Kampala Policy Brief Series · 10 · AKADEMIYA2063.

  3. Sean Woolfrey, Livia Bizikova, Christian Henning, Esther Boere, Marta Kozicka, David Laborde, Valeria Pineiro, Andrey Augustynczik, Michael Grunenberg, Petr Havlik, Nelson Illescas, Sherin Khalifa, Claire McConnell, Elsa Olivetti, and Johannes Ziesmer (2024).

    Modelling the impacts of policy interventions for food systems transformation in Indonesia

    Governance and Policy Support Report · FAO.

  4. Johannes Ziesmer (2022).

    Samples, weights, and nonresponse: Wave 16 of the student sample of the national educational panel study

    Leibniz Institute for Educational Trajectories.

  5. Johannes Ziesmer (2022).

    Samples, weights, and nonresponse: Wave 17 of the student sample of the national educational panel study

    Leibniz Institute for Educational Trajectories.

  6. Ariane Würbach, Uta Landrock, Thorsten Schnapp, Johannes Ziesmer, and Michael Bergrab (2021).

    NEPS technical report for weighting – the additional corona survey of the national educational panel study

    NEPS Survey Paper No. 89 · Leibniz Institute for Educational Trajectories.

  7. Johannes Ziesmer (2021).

    Samples, weights, and nonresponse: Wave 15 of the student sample of the national educational panel study

    Leibniz Institute for Educational Trajectories.

  8. Friedhelm Taube, Christian Henning, Johannes Hedtrich, Kai-Uwe Strelow, Christof Kluß, and Thorsten Reinsch (2019).

    2. Nährstoffbericht des Landes Schleswig-Holstein

    Ministerium für Energiewende, Landwirtschaft, Umwelt und ländliche Räume des Landes Schleswig-Holstein.

  9. Ding Jin, Johannes Hedtrich, and Christian Henning (2018).

    Applying Meta-modeling for extended CGE-modeling: Sampling techniques and potential application

    Agricultural Policy Working Paper Series · WP2018-03 · Kiel University.

  10. Christian Henning, Johannes Hedtrich, Jan Christiansen, and Rudolf Berghammer (2017).

    Political power in non-cooperative legislative bargaining games: A modified baron-ferejohn game with application to decision-making in the common agricultural policy of the european union

    Agricultural Policy Working Paper Series · WP2017-01 · University of Kiel.

  11. Christian Henning, Johannes Hedtrich, and Ligane Sene (2015).

    Identifying key sectors and key policies of pro poor growth: An integrated approach linking a bayesian econometric model with a dynamic general equilibrium approach

    PEBAP Working Paper No. 23.

  12. Christian H. C. A. Henning, Ligane Sene, Johannes Hedtrich, Cheikh Sadibou Fall, and Michael Johnson (2015).

    Implementing CAADP 2025 in Senegal: Identifying key sectors and policies promoting pro-poor growth

    IFPRI-Policy Brief, Washington D. C..

  13. Christian Henning, Johannes Hedtrich, Patience Rwamigisa, and Michael Johnson (2015).

    Implementing CAADP-2025 in Uganda – Is there a convergence of ideas among stakeholders?

    IFPRI Policy Brief · International Food Policy Research Institute (IFPRI).

  14. Christian Henning, Johannes Hedtrich, and Kai-Uwe Strelow (2012).

    A online tool to collect ego-centric network data

    Working paper of Teilprojekt 4.1, Fokus-Verbundprojekt 4, gesundheitliche Bewertung und Konsumverhalten, University of Kiel.

  15. Christian Henning, Ernst C. Albrecht, Antje Herrmann, Friedhelm Taube, Nana Zarnekow, Johannes Hedtrich, and Kai-Uwe Strelow (2012).

    Regionales Ökologisch-polit-ökonomisches Verbundmodell zur polit-ökonomischen analyse nachhaltiger Landnutzungspolitiken in Schleswig-Holstein

    Working Paper, Abteilung Agrarpolitik, University of Kiel.

  16. Christian H. C. A. Henning, Volker Saggau, and Johannes Hedtrich (2009).

    A mean field theory approach to farm exit, diversification and investment decisions

    ADVANCED-EVAL Working Paper Series · WP5-7 · Institute of Agricultural Economics, University of Kiel, Germany.

  17. Christian H. C. A. Henning, Volker Saggau, Johannes Hedtrich, Christoph Kluß, Wolfgang Britz, Simon von Janowsky, and Nana Zarnekow (2009).

    Application of a micro-macro linked ABM-CGE model to analyze rural development in high and low performing rural regions in Poland and Slovakia

    ADVANCED-EVAL Working Paper Series · Regional Report RR5-1 [D 23] · Institute of Agricultural Economics, University of Kiel, Germany.

  18. Christian H. C. A. Henning, Volker Saggau, and Johannes Hedtrich (2009).

    Belief formation in communication networks and social capital

    ADVANCED-EVAL Working Paper Series · WP4-15 · Institute of Agricultural Economics, University of Kiel, Germany.

  19. Christian H. C. A. Henning, Wolfgang Britz, Johannes Hedtrich, and Volker Saggau (2009).

    Model based ex-ante evaluation of RD policies: Derivation and application of a micro-macro linked ABM-CGE model

    Project Report, EU-Project ADVANCED-EVAL · Institute of Agricultural Economics, University of Kiel, Germany.

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Presentations & conference contributions

Includes co-authored conference contributions and workshop presentations.

  1. Johannes Ziesmer and Christian H. C. A. Henning (2026).

    Kampala Policy Brief #10: Enhancing the Effectiveness and Impacts of Public Agricultural Expenditure under CAADP

    Presented in Webinar Session VI of the Kampala CAADP Series, AKADEMIYA2063, online, 18 June.

  2. Christian Henning, Sonja Peterson, and Johannes Ziesmer (2025).

    Global Trade Networks as a Commitment Device in International Climate Policy? – A Metamodeling Approach Assessing Multi-Layer Trade Networks as Determinants of Abatement Cost Spillovers of National Carbon Emission Reductions

    Organised session “Machine Learning & Economic Modelling” at the XVIII Congress of the European Association of Agricultural Economists, Bonn, Germany, 27 August.

  3. Johannes Ziesmer, Christian Aßmann, and Christian Henning (2022).

    Key sectors of sustainable development: A Bayesian framework estimating policy impacts in a general equilibrium

    Presented at AgEconMeet 2022, Göttingen.

  4. Christian H. C. A. Henning, Johannes Hedtrich, Jan Christiansen, and Rudolf Berghammer (2019).

    A generalized voting power index: A theoretical conception and applied computation for a modified baron-ferejohn legislative bargaining game

    Presented at the 2019 Meeting of the European Public Choice Society in Jerusalem, Israel.

  5. Johannes Hedtrich and Christian H. C. A. Henning (2019).

    Assessing policy failure in a general political equilibrium framework

    Presented at the 2019 Meeting of the European Public Choice Society in Jerusalem, Israel.

  6. Johannes Hedtrich and Christian H. C. A. Henning (2019).

    Narratives in Economic Modelling: A New Kid on the Block?

    Presented at the 22nd Annual Conference on Global Economic Analysis (GTAP), Warsaw, Poland.

  7. C. Henning, J. Hedtrich, and L. Sene (2018).

    Assessing policy failure in a general political equilibrium framework: Derivation and application of a new CGPE-approach

    presented at the 21. Annual Conference on Global Economic Analysis (GTAP) in Cartagena, Colombia.

  8. Christian H. C. A. Henning, Johannes Hedtrich, Jan Christiansen, and Rudolf Berghammer (2018).

    Computation of equilibrium of the baron-ferejohn legislative bargaining game

    presented at the European Public Choice in Rom, Italy.

  9. J. Hedtrich, E. Fabritz, C. Henning, and B. Thalheim (2018).

    Digital playground for policy decision making

    presented at the ’Data Analytics and Management in Data Intensive Domaine (DAMDID)’ in Moscow, Russia.

  10. Johannes Hedtrich, Christian Aßmann, and Christian Henning (2018).

    Key Sectors – Key Policies: Challenges in Estimating and Validating a Policy-Impact Function

    Presented at the 21st Annual Conference on Global Economic Analysis (GTAP), Cartagena, Colombia.

  11. J. Christiansen, S. Dylus, J. Hedtrich, C. Henning, and R. Berghammer (2018).

    Verwendung von Programmiersprachentechniken in der Sozialwahltheorie

    presented at the 35. Jahrestreffen der GI-Fachgruppe ’Programmiersprachen und Rechenkonzepte’ in Bad Honnef, Germany.

  12. Johannes Hedtrich (2018).

    When science meets politics: Introduction of the CAADP policy tool kit

    Presented at: Prä-Konferenz-Workshop III ’Political Economy and Behavioral Economics on Development Policies and Policy Process’ at the 58. Jahrestagung der GeWiSoLa in Kiel.

  13. Johannes Hedtrich (2017).

    Key sectors and key policies for an effective PPG-strategy in ghana, senegal, and uganda

    presented at the 2017 ReSAKSS Annual Conference, Maputo, Mozambique.

  14. Johannes Hedtrich (2017).

    Whither participation? Evaluating participatory policy processes with the CGPE approach: The case of CAADP in Malawi

    presented at the 2017 ReSAKSS Annual Conference, Maputo, Mozambique.

  15. Christian H. C. A. Henning and Johannes Hedtrich (2016).

    Conception of CAADP policy lab. Presentation of the policy-tool CAADP policy lab

    presented at International Food Policy Research Institute (IFPRI).

  16. Christian H. C. A. Henning and Johannes Hedtrich (2016).

    Future GFSS-extensions. Presentation of the policy-tool CAADP policy lab

    presented at International Food Policy Research Institute (IFPRI).

  17. Johannes Hedtrich (2016).

    Identifying key sectors and key policies of pro poor growth: An integrated approach linking a bayesian econometric model with a dynamic general equilibrium approach

    presented at the Self Organized Session ’Modelling and Evaluation of Development Policies and Policy Processes: The PEBAP-Project during the GEWISOLA.

  18. Christian H. C. A. Henning and Johannes Hedtrich (2016).

    Identifying key sectors and key policies of pro poor growth: An integrated approach linking a bayesian econometric model with dynamic general equilibrium approach

    presented at International Food Policy Research Institute (IFPRI).

  19. Christian H. C. A. Henning and Johannes Hedtrich (2016).

    Presentation of the policy-tool CAADP policy lab

    presented at United States Agency for International Development (USAID).

  20. Christian H. C. A. Henning and Johannes Hedtrich (2016).

    Theoretical framework of the policy-tool CAADP policy lab

    presented at International Food Policy Research Institute (IFPRI).

  21. Johannes Hedtrich (2016).

    What drives participatory and evidence-based policy processes in development politics: Grassroot activities, scientific knowledge or donor money? A comparative policy network approach applied to Ghana, Senegal and Uganda

    presented at the Interactive Workshop ’Modelling and Evaluation of CAADP Policies and Policy Processes’ in Dakar, Senegal.

  22. Johannes Hedtrich and Ligane Sene (2015).

    Analytical Toolkit - Schafft Wissen!

    präsentiert auf der Eröffnungsveranstaltung des Promotionsschwerpunktes "Ein Dritter Weg zur Ernährung der Einen Welt" in Kiel.

  23. Johannes Hedtrich (2015).

    Introducing to CAADP-LAB: A Policy-Tool-Kit for Evaluation and Formulation of CAADP Policy Options

    Presented at the Interactive Workshop "Making CAADP Work in Uganda" in Entebbe, Uganda.

  24. Christian H. C. A. Henning and Johannes Hedtrich (2015).

    Introducing to CAADP-LAB: A Tool Kit Facilitating Participatory and Evidence-Based Agricultural Processes in Africa

    Presented at the ReSAKSS Board Meeting in Addis Abeba, Ethiopia.

  25. Johannes Hedtrich (2015).

    Introduction to CAADP-LAB: A policy tool kit for evaluation and formulation of CAADP policy options

    presented at the Interactive Workshop "Making CAADP Work in Senegal in Saly, Senegal.

  26. Johannes Hedtrich (2015).

    Participant Expert Views on Policy Growth and Growth-Poverty Relations in Ghana

    Presented at the Interactive Workshop "Making CAADP Work in Ghana", Akosombo, Ghana.

  27. Johannes Hedtrich and Christian H. C. A. Henning (2013).

    A Bayesian rationality to follow opinion leaders? Belief formation and social influence in networks and their impact on macro-behavior

    Paper presented at the XXXIII Sunbelt International Network for Social Network Analysis (INSNA), Hamburg, Germany.

  28. Christian H. C. A. Henning, Johannes Hedtrich, and Sascha Stark (2013).

    Micro-macro-linked ABM-FHM-CGE models for senegal, ghana and uganda

    presented at the 1. Progress Seminar ot the BMZ-Project PEBAP.

  29. Christian H. C. A. Henning, Nana Zarnekow, Svetlana Petri, Ernst Albrecht, and Johannes Hedtrich (2013).

    Public evaluation and political acceptance of sustainable land use polices: An econometric application to biogas subsidization in germany

    Paper accepted for presentation at the 2013 AAEA & CAES Joint Annual Meeting in Washington, D. C., USA.

  30. Christian H. C. A. Henning, Christian Aßmann, and Johannes Hedtrich (2012).

    The Co-evolution of policy networks and political knowledge: An econometric approach to the emergence of local elite networks and government performance

    Paper presented at the Second World Congress of the Public Choice Societies, Miami, USA.

  31. Christian H. C. A. Henning and Johannes Hedtrich (2011).

    Assessing political performance gaps: Application of an evolutionary CGPE-approach to CAADP in Malawi

    Paper presented at the International Workshop jointly organized with IFPRI (International Food Policy Research Institute) ’Modelling and Evaluation of CAADP - Policies: Theory, Methods and Application’, Kiel.

  32. Volker Saggau, Christian H. C. A. Henning, and Johannes Hedtrich (2011).

    Modelling and evaluation of agricultural policy applying a micro-macro linked ABM-CGE approach

    Paper presented at the International Workshop jointly organized with IFPRI (International Food Policy Research Institute) ’Modelling and Evaluation of CAADP - Policies: Theory, Methods and Application’, Kiel.

  33. Christian Aßmann, Christian H. C. A. Henning, and Johannes Hedtrich (2011).

    The emergence of local elite networks and political performance: A combination of an agent-based and an econometric approach

    Poster presented at the 4th Annual Political Networks Conference at the University of Michigan, Ann Arbor, USA.

  34. Christian H. C. A. Henning, Volker Saggau, and Johannes Hedtrich (2010).

    Elite networks, political belief formation and government performance: An agent-based approach to a general political economy equilibrium

    Paper presented at the 3rd Annual Political Networks Conference, Duke University, USA.

  35. Christian H. C. A. Henning, Volker Saggau, and Johannes Hedtrich (2010).

    The impact of local elite networks on policy learning and government capture in decentralized and centralized systems: Simulation analyses based on a computable general political economy equilibrium

    Paper presented at the International Workshop on Advances in Agent-Based Computational Economics - ADACE 2010, ZiF, Bielefeld University, Germany.

  36. Christian H. C. A. Henning, Volker Saggau, and Johannes Hedtrich (2009).

    Ecological modeling of macrobehavior - a micro-macro linked ABM-CGE approach with applications to rural development

    Paper presented at the EU-Project ADVANCED-EVAL Workshop ’Networks as Determinants of Economic and Political Behavior’, Kiel, Germany.

  37. Christian H. C. A. Henning, Volker Saggau, and Johannes Hedtrich (2009).

    Networks, belief formation and diversification of the farm sector: A micro-macro linked ABM-CGE approach

    Paper presented at the EU-Project ADVANCED-EVAL Workshop ’Networks as Determinants of Economic and Political Behavior’ in Kiel, Germany.

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