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A POSTERIORI: A conclusion reached through logical reasoning based on facts and observations about the real world. This notion is closely related to the scientific verification of hypotheses and the identification of principles. A similar sounding, but opposite term is a prior, which is a unverified presumption made before an analysis is undertaken. For example, in the study of economics of crime you might assume, a priori, that people are basically "good", 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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MARGINAL COST AND LAW OF DIMINISHING MARGINAL RETURNS

Decreasing then increasing marginal cost, reflected by a U-shaped marginal cost curve, is the result of increasing then decreasing marginal returns. In particular the decreasing marginal returns is caused by the law of diminishing marginal returns. As such, the law of diminishing marginal returns affects not only the short-run production of a firm but also the cost of short-run production. This translates into a positively-sloped supply curve for profit-maximizing competitive firms.

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PINK FADFLY
[What's This?]

Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors wanting to buy either looseleaf notebook paper or a three-hole paper punch. Be on the lookout for gnomes hiding in cypress trees.
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This isn't me! What am I?

In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"In a time of drastic change, it is the learners who inherit the future. "

-- Eric Hoffer, philosopher

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Journal of Econometrics
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