The use of economic models, like the cost-benefit principle, means economists believe that:

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Economists use economic models, including the cost-benefit principle, as a reasonable abstraction of how people make decisions between alternatives. They understand that this is not necessarily how all individuals make decisions, but it provides a framework for analyzing and predicting behavior. There is no belief that those who explicitly use these principles are smarter, nor is there an assumption that all individuals will start making decisions this way with enough education.

The Use of Economic Models, Like the Cost-Benefit Principle, Means