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EQUILIBRIUM, LONG-RUN AGGREGATE MARKET: The state of equilibrium that exists in the long-run aggregate market when real aggregate expenditures are equal to full employment real production with no imbalances to induce changes in the price level or real production. The opposing forces of aggregate demand (the buyers) and long-run aggregate supply (the sellers) exactly offset each other. Equilibrium in the long-run aggregate market also involves simultaneous equilibrium in the aggregated financial and resource markets. Long-run price flexibility ensures that all three aggregate markets are in equilibrium.

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BARRIERS TO ENTRY

Institutional, government, technological, or economic restrictions on the entry of participants into a market or industry. The four primary barriers to entry are: (1) resource ownership, (2) patents and copyrights, (3) government restrictions, and (2) start-up cost. Barriers to entry are a key reason for market control and the inefficiency that results. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time touring the new suburban shopping complex hoping to buy either a birthday gift for your uncle or a pair of red and purple designer socks. Be on the lookout for the last item on a shelf.
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On a typical day, the United States Mint produces over $1 million worth of dimes.
"We succeed in enterprises (that) demand the positive qualities we possess, but we excel in those (that) can also make use of our defects. "

-- Alexis de Tocqueville, statesman, author

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Net Present Value
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