The methodology of positive economics

Abstract

Positive economics constitutes an objective science independent of ethical or normative judgments, functioning to provide a system of generalizations that yield accurate predictions about the consequences of changes in circumstances. The performance of an economic theory is judged by the precision, scope, and empirical conformity of the predictions it generates. Fundamental to this methodology is the principle that a hypothesis cannot be tested by the descriptive realism of its assumptions. Because significant theories must abstract from the complexity of reality to isolate crucial variables, their assumptions are necessarily inaccurate representations of the actual world. The validity of a theory rests solely on its predictive power; assumptions serve only as an economical mode of describing the model or specifying the conditions under which the theory is expected to hold. While positive and normative economics remain distinct, progress in the former is essential for achieving consensus on policy, as many normative disagreements stem from divergent predictions regarding economic outcomes rather than fundamental differences in values. Science thus advances through the construction of hypotheses that are simple, fruitful, and consistently fail to be contradicted by observed phenomena. – AI-generated abstract.