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March 5, 2024 

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EIGHT-FIRM CONCENTRATION RATIO: The proportion of total output in an industry that's produced by the eight largest firms in the industry. This is one of two common concentration ratios. The other is the four-firm concentration ratio. The eight-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and how market control is held by the eight largest firms in the industry.

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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.

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


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CHECK CLEARING

The process in which reserves or funds are transferred among banks to settle the accounts of checks written on one account and deposited into another. Check clearing is the heart and sole of daily banking activity and the final step in the use of checkable deposits as the medium of exchange for conducting transactions in the economy. Check clearing is facilitated by central clearinghouses, including the Federal Reserve System and a number of private organizations. The check clearing process is also a key component of the money creation process.

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Today, you are likely to spend a great deal of time at an auction seeking to buy either a bookshelf that will fit in your closet or a birthday greeting card for your grandfather. Be on the lookout for slightly overweight pizza delivery guys.
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The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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American Economic Review
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