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DOUBLE COINCIDENCE OF WANTS: The requirements of a barter exchange that each trader has want the other wants and wants what the other has. Because everyone doesn't necessarily want everything, the lack of double coincidence of wants is a major obstacle in barter exchanges, especially for complex, modern economies. While double coincidence of wants is also essential for exchanges involving money, it's such an inherent trait of money we don't think twice about it. By its very nature as a generally accepted medium of exchange, everyone WANTS money.

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AGGREGATE SUPPLY

The total (or aggregate) real production of final goods and services available in the domestic economy at a range of price levels, during a given time period. Aggregate supply, usually abbreviated AS, is two different relations between price level and real production--long run and short run. With long-run aggregate supply, prices and wages are flexible and all markets are in equilibrium. With short-run aggregate supply some prices and wage are NOT flexible and some markets are NOT in equilibrium. This is one half of the AS-AD (aggregate market) analysis. The other half is aggregate demand.

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Today, you are likely to spend a great deal of time flipping through mail order catalogs hoping to buy either a handcrafted bird house or a weathervane with a chicken on top. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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In his older years, Andrew Carnegie seldom carried money because he was offended by its sight and touch.
"Believe and act as if it were impossible to fail."

-- Charles F. Kettering

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