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ARC ELASTICITY: The average elasticity for discrete changes in two variables, A and B. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of the initial and ending values of each variable, rather than only initial values. Arc elasticity is generally calculated using the midpoint formula. Arc elasticity should be compared with point elasticity. For infinitesimally small changes in variables A and B, arc elasticity is the same as point elasticity.

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AD: The abbreviation for aggregate demand, which is 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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GOVERNMENT SECTOR

The aggregate macroeconomic sector that includes all levels of government, including federal, state, and local. The primary function of the government sector, also termed the public sector, is to impose resource allocation decisions on the rest of the economy that might not be made otherwise. This is one of the four macroeconomic sectors. The other three are household sector, business sector, and foreign sector.

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