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It Mgr

In:

Submitted By estudiantep2012
Words 2252
Pages 10
Applying the Supplyand-Demand Model

Topics To Be Covered
How the shapes of demand and supply curves matter? Sensitivity of quantity demanded to price. Sensitivity of quantity supplied to price. Long run versus short run Effects of a sales tax.

© 2009 Pearson Addison-Wesley. All rights reserved.

3-2

How shapes of demand and supply matter? The shapes of the demand and supply curves determine by how much a shock affects the equilibrium price and quantity. Example: processed pork (same as Chapter 2)
Supply depends on the price of pork and the price of hogs.

© 2009 Pearson Addison-Wesley. All rights reserved.

3-3

1

Figure 3.1 How the Effect of a Supply Shock Depends on the Shape of the Demand Curve
This shift of the supply curve causes a movement along the demand curve… (a) A $0.25 increase in the price of pork causes the supply of pork to shift to the left. e2 e1 (b) A $0.25 increase in the price of pork causes the supply of pork to shift to the left p, $ per kg D2

p, $ per kg

D1

3.55 3.30

S2 S1

3.675 3.30

e2 S2 S1 e1

0

176

215220

0

176

220

Q, Million kg of pork per year

Q, Million kg of pork per year

and a reduction in quantity.
© 2009 Pearson Addison-Wesley. All rights reserved.

But equilibrium quantity does not change since consumption is not sensitive to price
3-4

Figure 3.1 How the Effect of a Supply Shock Depends on the Shape of the Demand Curve
(cont’d)
p, $ per kg

When demand is very sensitive to price… a shift in the supply curve to S2… has no effect on the equilibrium price and a substantial effect on the quantity

(c)

3.30

D3 S2 S1

e2 e1

0

176

205

220

Q, Million kg of pork per year

© 2009 Pearson Addison-Wesley. All rights reserved.

3-5

Sensitivity of quantity demanded to price. Elasticity – the percentage change in a variable in response

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