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November 13, 2026 

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OLIGOPOLY, CONCENTRATION: Oligopoly is a market structure that contains a small number of relatively large firms, meaning oligopoly markets tend to be concentrated. A small number of large firms account for a majority of total output. Concentration unto itself is not necessarily bad, but it often leads to inefficient behavior, such as collusion and nonprice competition. Concentration is measured in three ways--market share, concentration ratio, Herfindahl index.

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AGGREGATE DEMAND

The total real expenditures on final goods and services produced in the domestic economy that buyers are willing and able to undertake at different price levels, during a given time period (usually a year). Aggregate demand, usually abbreviated AD, is an inverse relation between price level and aggregate expenditures. This is one half of the AS-AD (aggregate market) analysis. The other half is aggregate supply. Aggregate demand consists of four aggregate expenditures--consumption expenditures, investment expenditures, government purchases, and net exports--made by the four macroeconomic sectors--household, business, government, and foreign.

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APLS

ORANGE REBELOON
[What's This?]

Today, you are likely to spend a great deal of time wandering around the downtown area looking to buy either a box of multi-colored, plastic paper clips or several orange mixing bowls. Be on the lookout for gnomes hiding in cypress trees.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"Are you bored with life? Then throw yourself into some work you believe in with all your heart. Live for it, die for it, and you will find happiness that you had thought could never be yours. "

-- Dale Carnegie, writer

IIA
Irrelevance of Independent Alternatives
A PEDestrian's Guide
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