Model Assumptions and Behavioral Economics

Many foundational economic models, like the basic supply-and-demand model, assume people act as fully rational, self-interested decision-makers with complete information, a simplifying assumption that makes a model easier to build and analyze, not necessarily an exact description of how any specific real person actually behaves. Behavioral economics studies the ways real decision-making systematically departs from that idealized assumption, for example how people often weigh a loss more heavily than an equivalent gain, or rely on simple mental shortcuts instead of fully working through every option, insights that can improve a model's own predictions without discarding the basic supply-and-demand framework entirely.

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