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MARGINAL ANALYSIS: A basic technique used in the economics that analyzes small, incremental changes in key variables. The economic obsession with marginal changes exists for at least two reasons. One reason is that many economic decisions made in the real world are made "at the margin." A second reason for using marginal analysis can best be termed analytical sophistication.

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Lesson 5: Market Demand | Unit 4: Determinants Page: 18 of 20

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  • Why relaxing the ceteris paribus assumption enables further analysis of demand and markets.
  • How the changes in the demand determinants cause rightward or leftward shifts in the demand curve.
  • The five basic demand determinants: income, preferences, prices of other goods, buyers' expectations, and number of buyers.
  • How income affects the demand for normal goods differently than inferior goods.
  • How a change in the price of a substitute goods affects demand differently than a change in the price of a complement good.
  • Most important of all, the difference between a change in demand, caused by a change in a demand determinant, and a change in quantity demanded, caused by a change in price.


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AGGREGATE DEMAND

The total real expenditures on final goods and services produced in the domestic economy that buyers are willing and able to undertake at different price levels, during a given time period (usually a year). Aggregate demand, usually abbreviated AD, is an inverse relation between price level and aggregate expenditures. This is one half of the AS-AD (aggregate market) analysis. The other half is aggregate supply. Aggregate demand consists of four aggregate expenditures--consumption expenditures, investment expenditures, government purchases, and net exports--made by the four macroeconomic sectors--household, business, government, and foreign.

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