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July 21, 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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RESERVES: The vault cash and deposits at the Federal Reserve System that banks use to complete day-to-day transactions.

     See also | bank | vault cash | Federal Reserve deposits | required reserves | legal reserves | excess reserves |


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EQUILIBRIUM, AGGREGATE MARKET

The state of equilibrium that exists in the aggregate market when real aggregate expenditures are equal to real production with no imbalances to induce changes in the price level or real production. The opposing forces of aggregate demand (the buyers) and aggregate supply (the sellers) exactly offset each other. At the existing price level, the four macroeconomic sectors (household, business, government, and foreign) purchase all of the real production that they seek and producers sell all of the real production that they have.

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BEIGE MUNDORTLE
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Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either a replacement battery for your pocket calculator or a how-to book on home remodeling. Be on the lookout for strangers with large satchels of used undergarments.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
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