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MARKET FAILURE: A condition in which a market does not efficiently allocate resources to achieve the greatest possible consumer satisfaction. The four main market failures are--(1) public good, (2) market control, (3) externality, and (4) imperfect information. In each case, a market acting without any government imposed direction, does not direct an efficient amount of our resources into the production, distribution, or consumption of the good.

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AGGREGATE DEMAND: The total (or aggregate) real expenditures on final goods and services produced in the domestic economy that buyers would willing and able to make at different price levels, during a given time period (usually a year). Aggregate demand (AD) is one half of the aggregate market analysis; the other half is aggregate supply. Aggregate demand, relates the economy's price level, measured by the GDP price deflator, and aggregate expenditures on domestic production, measured by real gross domestic product. The aggregate expenditures are consumption, investment, government purchases, and net exports made by the four macroeconomic sectors (household, business, government, and foreign).

     See also | economy | aggregate expenditures | domestic | aggregate market analysis | price level | real production | aggregate supply | GDP price deflator | gross domestic product | real gross domestic product | consumption expenditures | investment expenditures | government purchases | net exports | household sector | business sector | government sector | foreign sector | market demand | interest-rate effect | real-balance effect | net-export effect | income effect | substitution effect |


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AGGREGATE DEMAND, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2026. [Accessed: October 5, 2026].


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ASSUMPTIONS, PRODUCTION POSSIBILITIES

The four key assumptions underlying production possibilities analysis are: (1) resources are used to produce one or both of only two goods, (2) the quantities of the resources do not change, (3) technology and production techniques do not change, and (4) resources are used in a technically efficient way.

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