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July 3, 2026 

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S-I MODEL: A model used to identify equilibrium in Keynesian economics based on injections (investment, I) and leakages (saving, S) for the two basic sectors (household and business). Equilibrium is achieved at the intersection of the saving line, S, and the investment line, I.

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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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ORANGE REBELOON
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Today, you are likely to spend a great deal of time searching for a specialty store trying to buy either one of those memory foam pillows or a remote controlled train set. Be on the lookout for telephone calls from long-lost relatives.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
"Far and away the best prize that life has to offer is the chance to work hard at work worth doing."

-- Theodore Roosevelt, 26th US president

IROR
Internal Rate of Return
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