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September 4, 2026 

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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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MARKET STRUCTURE CONTINUUM

The four common market structures, perfect competition, monopoly, monopolistic competition, and oligopoly, can be viewed as a continuum based on (1) differences in the number of firms in a market, (2) the relative size of each firm, and thus (3) the market control of each firm. Perfect competition lies at one end and monopoly at the other. Monopolistic competition is close to perfect competition and oligopoly is near monopoly. The essence of the continuum is that monopolistic competition blends into oligopoly, with no clear-cut line of separation.

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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors seeking to buy either a large flower pot shaped like a Greek urn or a small palm tree that will fit on your coffee table. Be on the lookout for cardboard boxes.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Don't waste your effort on a thing that results in a petty triumph unless you are satisfied with a life of petty issues. "

-- John D. Rockefeller, industrialist

JEP
Journal of Economic Perspectives
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