The didactic value of linking models: experiences from the LEI model funnel
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The complexity of agri-environmental economic issues is such that
a model that is fully consistent at all levels of aggregation and all
type of questions to be addressed is not available at the Agricultural
Economics Research Institute in the Hague LEI. Such a model is
probably also not feasible. At LEI this problem is solved by linking
models at different scales of analysis: global economic, national
economy-wide, regional agricultural, national spatial and farm levels.
This linked model system enlarges scope and consistency of
the analysis. The goal of the model linking, however, is not a full
integration and, ultimately, simultaneous optimization of the models.
Therefore, the different models of the LEI model funnel are often
rather loosely linked. Hence, it is not surprising that the models
sometimes produce different results even for the shared variables.
This article describes the difficulties to share and exchange information
between different models and identifies possible solutions
which aim at a more consistent analysis along the models combined
at LEI while maintaining the diversity of modelling approaches.