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December 14, 2025 

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INDETERMINANT: The term commonly used to indicate that the direction of the change in either price or quantity is not known when the market experiences simultaneous shifts in both the demand and supply curves. For example, an increase in both demand and supply definitely increases the quantity exchanged. But whether the market price increases or decreases is indeterminant.

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PURCHASING POWER: In general the quantities of goods and services that can be bought with a given amount of money. The notable feature of purchasing power is that it declines as prices rise. In particular, inflation is the number one nemesis of purchasing power. When inflation gives higher prices, purchasing power falls. Be careful, though, that you don't get too caught up in the purchasing power of just a single dollar. The real question is not how much stuff one dollar can buy, but how many dollars you have. In other words, while the price of a brand new car might have been $10 when you were a kid (in the good old days), the average annual income was also $20. That's the same purchasing power as a $10,000 car price and a $20,000 income.

     See also | real | nominal | money | price level | inflation | cost of living | living standard | store of value |


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INFLATIONARY EXPECTATIONS, AGGREGATE DEMAND DETERMINANT

One of several specific aggregate demand determinants assumed constant when the aggregate demand curve is constructed, and that shifts the aggregate demand curve when it changes. An increase in the inflationary expectations causes an increase (rightward shift) of the aggregate curve. A decrease in the inflationary expectations causes a decrease (leftward shift) of the aggregate curve. Other notable aggregate demand determinants include interest rates, federal deficit, and the money supply.

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