A Multi-Actor Dynamic Integrated Assessment Model System (MADIAMS)




A Multi-Actor Dynamic Integrated Assessment Model System (MADIAMS) is an actor-based system-dynamic model hierarchy to assess the impacts of climate mitigation policies. The evolution of the modeled closed economy is governed by the interactions of a few key aggregated actors (a firm, household, government, bank etc.) pursuing individual, often conflicting, goals. The economy is treated as a nonlinear system described by a set of system dynamic equations closed by the specification of the actors’ control strategies. An important feature of MADIAMS is the explicit treatment of non-equilibrium processes.


MADIAMS is developed by

Klaus Hasselmann (Max Planck Institute for Meteorology/ Global Climate Forum) and 

Dmitry V. Kovalevsky (Nansen International Environmental and Remote Sensing Centre/ Nansen Environmental and Remote Sensing Center/ St. Petersburg State University/ Global Climate Forum)


The second level of the three-level model hierarchy of MADIAMS – the model M2-hk.mdl (the main economic module of MADIAMS) and the supplementary stand-alone boom-and-bust cycle module Financial-7.mdl with documentation and model runs can be freely downloaded here.


The model can be run in Vensin ® DSS simulation software.

The modeling concept and the system of model equations is described in detail in

Hasselmann K., Kovalevsky D.V. (2013) Simulating animal spirits in actor-based environmental models. Environmental Modelling & Software 44, 10-24


An in-depth discussion of the modeling concept can be also found in a working paper of GCF:

Hasselmann K. (2009) Simulating Human Behavior in Macroeconomic Models Applied to Climate Change. ECF Working Paper 3/2009


The model MADIAM (an earlier version of MADIAMS) was developed by Klaus Hasselmann in cooperation with Michael Weber and Volker Barth and is described in detail in

Weber M., Barth V., Hasselmann K. (2005) A multi-actor dynamic integrated assessment model (MADIAM) of induced technological change and sustainable economic growth. Ecological Economics 54, 306-327


The development of the version of MADIAMS M2-hk as presented on this webpage was supported by the networking project “Global System Dynamics and Policies” within the Future and Emerging Technologies (FET) Programme of the 7th Framework Programme for Research and Development of the European Commission under the FET-Open-Grant agreement GSD, number 221955. One of the authors (Dmitry V. Kovalevsky) also gratefully acknowledges the financial support of the Nansen Scientific Society (Bergen, Norway) and of the Russian Foundation for Basic Research (project No. 10-06-00238-a).

Currently the model MADIAMS is being further developed in the framework of the collaborative project COMPLEX (“Knowledge Based Climate Mitigation Systems for a Low Carbon Economy”) within the 7th Framework Programme for Research and Development of the European Commission, grant agreement number 308601.


Comments on MADIAMS are most warmly welcome. All feedback on the model should be sent to corresponding author:

Prof. Klaus Hasselmann 
Max Planck Institute for Meteorology,
Bundesstraße 53,
20146 Hamburg, Germany



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