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AGGREGATE DEMAND CURVE: A graphical representation of the relation between aggregate expenditures on real production and the price level, holding all ceteris paribus aggregate demand determinants constant. The aggregate demand, or AD, curve is one side of the graphical presentation of the aggregate market. The other side is occupied by the aggregate supply curve (which is actually two curves, the long-run aggregate supply curve and the short-run aggregate supply curve). The negative slope of the aggregate demand curve captures the inverse relation between aggregate expenditures on real production and the price level. This negative slope is attributable to the interest-rate effect, real-balance effect, and net-export effect.

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Lesson 12: Elasticity and Demand | Unit 3: Measurement Page: 10 of 25

Topic: Doing The Numbers <=PAGE BACK | PAGE NEXT=>

  • Suppose we have the following price and quantity values for the demand of calling minutes in cellular phones:

    P1 = 10 cents, Q1 = 5 million minutes, P2 = 11 cents, and Q2 = 4.5 million minutes.

  • Plugging theses numbers into the formula gives us:

    elasticity=- 0.105 ÷ 0.095=- 1.105

  • While the quick and dirty elasticity indicates exactly unit elastic demand (1 on the nose), the midpoint formula indicates relatively elasticity demand (1.105).

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AVERAGE REVENUE, MONOPOLY

The revenue received for selling a good per unit of output sold, found by dividing total revenue by the quantity of output. Average revenue often goes by a simpler and more widely used term... price. For a monopoly average revenue is greater than marginal revenue. Average revenue for a monopoly is often depicted by a negatively-sloped average revenue curve.

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