A PRIORI: A presumption made before an analysis is undertaken, often based on experiences, beliefs, or deductions from seemingly self-evident propositions about how the world works. This is a Latin for assumption or axiom. A similar sounding, but opposite term is a posteriori, which is derived from observation or facts. For example, in the study of economics of crime you might assume, a priori, that people are basically "good", because that just seems to be part of human nature, and conclude, a posteriori, that people are more likely to commit crimes when the threat of capture and conviction is lower.

     See also | axiom | assumption | theory | scientific method | a posteriori | principle | law | hypothesis | world view | data | empirical | verification |

A PRIORI, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: October 10, 2026].

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A macroeconomic model relating the price level and real production under the assumption that ALL prices are flexible. This is one of two aggregate market submodels used to analyze business cycles, gross production, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The other is the short-run aggregate market. The long-run aggregate market isolates the interaction between aggregate demand and long-run aggregate supply. The key assumption of this model is that ALL prices, especially resource prices, are flexible. The primary result of this model is that the economy achieves long-run equilibrium at full-employment real production.

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Today, you are likely to spend a great deal of time strolling through a department store wanting to buy either a wall poster commemorating the first day of winter or blue cotton balls. Be on the lookout for strangers with large satchels of used undergarments.
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