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July 24, 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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PRICE INDEX

A measure of the average of a group of prices calculated as a ratio to prices in a given time period (that is, a base year). A price index is primarily used to compare relative prices, or changes in the group prices over time. Such an index is a handy indicator of overall price trends. Two common price indexes that surface in the study of macroeconomics are the Consumer Price Index (CPI) and the GDP price deflator. Both are used to indicate the macroeconomy's average price level and to estimate the inflation rate. The Dow Jones Industrial Average (the Dow), Standard & Poor's 500, and the NASDAQ are well-known indexes of stock market prices.

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APLS

PINK FADFLY
[What's This?]

Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for jovial bank tellers.
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This isn't me! What am I?

A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
"The greatest use of life is to spend it for something that will outlast it."

-- William James, psychologist

MPS
Marginal Propensity to Save
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