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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.

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ABILITY-TO-PAY PRINCIPLE: A principle of taxation in which taxes are based on the income or resource-ownership ability of people to pay the tax. The income tax collected by our friends at the Internal Revenue Service is one of the most common taxes that seeks to abide by the ability-to-pay principle. In theory, the income tax system is set up such that people with greater incomes pay more taxes. Proportional and progressive taxes follow this ability-to-pay principle, while regressive taxes, such as sales taxes and Social Security taxes, don't.

     See also | benefit principle | tax | income | public goods | progressive tax | regressive tax | proportional tax | circular flow |


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ABILITY-TO-PAY PRINCIPLE, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: September 6, 2026].


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TOTAL FACTOR COST CURVE, PERFECT COMPETITION

A curve that graphically represents the relation between total factor cost incurred by a perfectly competitive firm when using a given factor of production to produce a good or service. The total factor cost curve is most important in factor market analysis for the derivation of the marginal factor cost curve.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time watching infomercials wanting to buy either a large red and white striped beach towel or a bottle of blackcherry flavored spring water. Be on the lookout for pencil sharpeners with an attitude.
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More money is spent on gardening than on any other hobby.
"The majority of men meet with failure because of their lack of persistence in creating new plans to take the place of those that fail. "

-- Napoleon Hill, author

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