Abstract
Models are at the heart of our ability to reason about complex systems. The content of our reasoning reflects the elements and relationships included in our system models. Analyses of problem solving protocols indicate that experts make use of several distinct types of models. Qualitative models represent a type of model that is designed to support reasoning about change. This reasoning process takes the form of a simulation that generates abstract summaries of possible system behaviors. Most research to date has explored the applicability of qualitative models to the representation and simulation of mechanical and electronic systems. In this paper, we review basic notions of qualitative modeling and suggest their straightforward application to economic reasoning . In addition, we introduce concepts sufficient to rep resent the equilibrium-based framework of many economic theories and to produce t he associated style of reasoning
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