ECON1102 Lecture Notes - Lecture 4: Xm Satellite Radio, Menu Cost, Exogeny

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18 May 2018

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4 – Income-Expenditure Model of GDP

Keynesian Model

• Key assumption (of friction):

 Prices of goods are fixed sticky’)

(a) Firms do not change prices in response to a change in demand for their

product

(b) Instead, they fix their price and then meet the demand by varying their level

of production

• In the short-run, firms will:

 Accommodate a cut in demand by reducing output and employment, not by

reducing prices

 Accommodate a rise in demand by increasing output and employment, not by

increasing prices

• Deeper assumptions

 Firms have some ability to set prices (not perfectly competitive world)

 Firms face some cost to changing prices (menu costs)

• In the long-run:

 Sustained or persistent changes in demand will eventually lead firms to change

their prices and cause production to return to normal capacity

Frictionless view of the world

• Fluctuations in demand will be accommodated by flexible prices and wages without

changes in output and employment

• There will never be excess production because firms will cut prices to sell it

• There will never be persistent unemployment because workers will cut their wages

to keep and get jobs

Expenditure measure of GDP

• Y = C + I + G + NX

Planned aggregate expenditure

• (Keynesian) assumption is that firms meet demand by changing production

• Implies:

 Aggregate output (or production) will be determined by the total level of desired

(or planned) spending

 PAE – total planned spending on domestically produced final goods and services

(a) Planned / desired spending

 Difference between actual and planned expenditure = (unplanned) changes in

inventories

 Y = PAE + uplaed ∆ietories

 Could be an unplanned fall in inventories if PAE > Y

Two concepts:

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• Aggregate expenditure: Y = C + I + G + (X – M)

• Planned aggregate expenditure: PAE = C + IP + G + (X – M)

Equilibrium and disequilibrium

• Equilibrium condition: Y = PAE

 Two equivalent decisions: I = IP

(a) uplaed ∆ietories = 

 No tendency for real GDP to change

• Disequilibrium: Y < PAE or Y > PAE

 In both cases, there will be some tendency for the level of GDP to change

Income-expenditure model assumes level of planned or desired aggregate expenditure

will determine the level of aggregate output

• PAE = C + IP + G + (X – M)

Two-sector model

• Assumptions (no simplifying):

 No government sector (G = T = 0)

 No foreign sector (i.e. a closed economy) (X = M = 0)

• Planned aggregate expenditure: PAE = C + IP

 Planned investment – IP = I0

(a) Assumed to be autonomous / exogenous variable

(b) Determined by factors other than GDP (Y)

• Household consumption:

 Non-durable goods

 Durable goods

 Services

Model of consumption expenditure

• Hypothesise that a key influence on consumption spending by households is current

disposable income (= Y – T)

 Y = national income or GDP

 T = taxes (TA) – transfers (TR) – interest on government debt (INT)

 Assume retained earnings (RE = 0)

• Consumption function: C = C0 + c (Y – T)

 Linear relationship

 Household consumption depends on:

(a) A constant C0, and

(b) Disposable income (Y – T)

 C0 is exogenous (or autonomous) consumption

(a) Factors (other than disposable income) that could affect consumption, e.g.

wealth, real interest rates

(b) The value of an exogenous variable is determined outside of the model under

consideration

 c (Y – T) captures the effect of disposable income on consumption (sometimes

called induced consumption)

(a) c = marginal propensity to consume (parameter)

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Document Summary

Accommodate a cut in demand by reducing output and employment, not by reducing prices. Accommodate a rise in demand by increasing output and employment, not by increasing prices: deeper assumptions. Firms have some ability to set prices (not perfectly competitive world) Firms face some cost to changing prices (menu costs) Sustained or persistent changes in demand will eventually lead firms to change their prices and cause production to return to normal capacity. Expenditure measure of gdp: y = c + i + g + nx. Planned aggregate expenditure (keynesian) assumption is that firms meet demand by changing production. Aggregate output (or production) will be determined by the total level of desired (or planned) spending. Pae total planned spending on domestically produced final goods and services (a) planned / desired spending. Difference between actual and planned expenditure = (unplanned) changes in inventories. Could be an unplanned fall in inventories if pae > y.

Related Questions

1. If the price level doubles and the real output doesn't change, then nominal output also doubles.
2. Inflation makes it less difficult to interpret the information conveyed by prices.

3. Laissez-faire economists oppose government intervention in the market process.

4. Active demand management policies are based on the work of JohnMaynard Keynes.

5. In the AS/AD model, as the price level rises, the real value of assets increases, causing consumption to increase. This is one reason why the aggregate demand curve slopes down.

6. The short-run aggregate supply curve is upward sloping in part because increases in aggregate demand cause some firms to increase their price markups.

7. If productivity and wages both raises by 3 percent, then the short-run aggregate supply curve does not shift.

8. The long-run aggregate supply curve is vertical because all prices adjust in the long run.

9. If the economy is not in long-run equilibrium and other things are equal, then prices will eventually adjust to bring the economy to long-run equilibrium.

10. Most economists agree that it is possible for fiscal policy to fine-tune the economy.

bluewolf591

Please help wtih these economics questions. I'll give the best answer to the person who justifies their answer.. or someone who does well in economics and knows the subject area well.

Which of the following statements is not true about Say's Law?

A. People produce more goods than they want for their own use only if they seek to trade them for other goods.

B. Markets would be regularly hit by severe shortages and surpluses.

C. Desired expenditures will equal actual expenditures.

D. Surpluses will be eliminated by falling prices and shortages will be eliminated by increasing prices.

Which of the following is not an assumption of the classical model?

A. Buyers and sellers react to changes in relative prices.

B. Households want to maximize economic well being.

C. Wages and prices will move freely in the upward direction but not the downward direction.

D. No single buyer or seller of a commodity can affect its price.

Money illusion is

A. when people think they are better off when their income increases even though prices have increased by the same amount.

B. when people are motivated by self-interest.

C. could not exist if the economy did not have competitive markets.

D. a basic condition that all classical economists assume people have.

Saving is not a problem in the classical model because

A. interest rates were flexible and savings were channeled into investment.

B. savers and investors were the same people.

C. the classical economists assumed that saving was beneficial to people for retirement.

D. saving would be spent by consumers eventually.

Which of the following statements is true?

A. There is an inverse relationship between investment and the interest rate.

B. There is no relationship between investment and the interest rate.

C. There is a direct relationship between investment and the interest rate.

D. Investment is always less than savings.

In the classical model, high unemployment due to either a demand or a supply shock

A. will return to its normal level quickly as wages adjust.

B. will persist if due to a supply shock but not if due to a demand shock.

C. can persist for an indefinite period of time.

D. never exists because unemployment can never deviate from its normal level.

The classical model makes little distinction between the long-run and short-run because

A. the model has not been fully developed yet.

B. prices adjust so fast that the economy is quickly moving towards the long-run.

C. the classical economists knew that we are always operating in the short run.

D. current changes influence the long run, so it is not possible to plan for the future.

In the classical model

A. the level of real GDP per year does not depend on the level of aggregate demand.

B. the level of GDP is demand determined.

C. the level of GDP determines prices independent of demand.

D. changes in aggregate supply affect the price level, not real GDP.

Which of the following is a true statement?

A. Classical economists believed output adjusted more than prices when aggregate demand fell while Keynes believed prices adjusted more than output.

B. Classical economists believed price adjusted more than output when aggregate demand fell while Keynes believed output adjusted more than prices.

C. A decrease in aggregate demand has no short-run effects according to the classical economists, but had significant effects according to Keynes.

D. A decrease in aggregate demand was not possible according to the classical economists, but was possible according to Keynes.

Which of the following is not a reason why GDP can be expanded beyond a level consistent with its long-run growth path in modern Keynesian analysis?

A. Prices and wages are flexible allowing for needed adjustments.

B. In the short-run existing workers can work more hours.

C. The existing capital stock can be used more intensively.

D. Higher prices induce firms to hire more workers.

A recessionary gap can be caused by

A. a decrease in aggregate supply holding aggregate demand constant.

B. an increase in aggregate demand holding aggregate supply constant.

C. an increase in the long run aggregate supply curve holding the aggregate demand constant.

D. a decrease in both aggregate demand and aggregate supply.

lemonpug153

Question 1 (1 point) Question 1 Unsaved In a competitive market the equilibrium price is determined: Question 1 options: at the intersection of the firmâs demand and the market supply curves. at the intersection of the market demand and supply curves. at the intersection of the firmâs demand and marginal cost curves. so as to cover the costs of the potential firms. so as to cover the costs of the firms currently in the industry. Save Question 2 (1 point) Question 2 Unsaved If the perfectly competitive market demand for gym shoes is given by QD = 100 â P and the market supply is given by QS = 10 + 2P, then the equilibrium price and quantity will be: Question 2 options: P = 50 and Q = 50. P = 40 and Q = 90. P = 40 and Q = 60. P = 30 and Q = 70. P = 25 and Q = 75. Save Question 3 (1 point) Question 3 Unsaved A constant-cost industry is one in which: Question 3 options: input prices do not change over time. technology does not change over time. input prices and technology do not change as firms enter or exit the industry. input prices and technology do not change over time. firms have reached the maturity phase of the industryâs life cycle. Save Question 4 (1 point) Question 4 Unsaved At the profit-maximizing level of output for the monopolist: Question 4 options: total revenue is equal to total cost. total costs are minimized. total revenue is maximized. marginal revenue is equal to marginal cost. average revenue is equal to average cost. Save Question 5 (1 point) Question 5 Unsaved Craigâs Red Sea Restaurant is the only restaurant in Columbia, South Carolina, that sells Ethiopian food. The demand for Ethiopian food is given by Q = 25 â P. Craigâs costs are given by TC = 25 + Q + 5Q2. Its maximum monopoly profit is: Question 5 options: â$1. $21. $22. $24. $26. Save Question 6 (1 point) Question 6 Unsaved So long as price exceeds average variable cost, in the model of monopolistic competition, a firm maximizes profits by producing where: Question 6 options: the difference between marginal revenue and marginal cost is maximized. marginal cost equals marginal revenue. marginal revenue equals price. the difference between price and marginal cost is maximized. price equals marginal cost. Save Question 7 (1 point) Question 7 Unsaved If a firm in a monopolistically competitive industry is profit maximizing, it should choose its level of advertising such that the marginal revenue of an additional dollar of advertising: Question 7 options: is equal to the elasticity of its demand curve minus 1. is exactly $1. increases revenues by $1. is equal to 1 plus the elasticity of its demand curve. is equal to the elasticity of its demand curve. Save Question 8 (1 point) Question 8 Unsaved Firms advertise in order to: Question 8 options: build brand loyalty. appeal to the price-sensitive consumers. increase the demand elasticities of their loyal customers. shift the market supply curve to the left. shift the market demand curve to the left. Save Question 9 (1 point) Question 9 Unsaved Firms offer promotions in order to: Question 9 options: build brand loyalty. appeal to the price-sensitive consumers. increase the demand elasticities of their loyal customers. shift the market supply curve to the left. shift the market demand curve to the left. Save Question 10 (1 point) Question 10 Unsaved If the demand increases for the product of a decreasing-cost industry: Question 10 options: short-run price goes up, but long-run price falls. long-run output goes up, but long-run price may go up or down. short-run output goes up, but long-run output may go up or down. long-run output goes up, but short-run price remains constant. long-run price goes up, but short-run price may go up or down. Save Question 11 (1 point) Question 11 Unsaved If the demand increases for the product of an increasing-cost industry: Question 11 options: short-run price goes up, but long-run price falls. long-run output goes up, but long-run price may go up or down. short-run output goes up, but long-run output may go up or down. long-run output goes up, but short-run price remains constant. short-run price goes up, and long-run price goes up. Save Question 12 (1 point) Question 12 Unsaved When Pan United Airlines gives a $400 fare discount to persons with student IDs, they are practicing: Question 12 options: first-degree price discrimination. second-degree price discrimination. third-degree price discrimination. markup pricing. tying. Save Question 13 (1 point) Question 13 Unsaved When a utility charges homeowners less than big industrial users, it is practicing: Question 13 options: first-degree price discrimination. fourth-degree price discrimination. third-degree price discrimination. markup pricing. tying. Save Question 14 (1 point) Question 14 Unsaved Cereal manufacturersâ use of coupons can be partially explained by: Question 14 options: first-degree price discrimination. second-degree price discrimination. third-degree price discrimination. markup pricing. tying. Save Question 15 (1 point) Question 15 Unsaved If a firm supplies separable markets with price elasticities h1 and h2, it should set prices P1 and P2 so that: Question 15 options: P1h1 = P2h2. P1 /h1 = P2 /h2. P1(1 + 1/h1) = P2 (1 + 1/h2). P1/(1 â 1 /h1) = P2 / (1 â 1/h2). P1 = 1 â 1/h1 and P2 = 1 â 1/h2. Save Question 16 (1 point) Question 16 Unsaved If a firm supplies separable markets with price elasticities h1 = â3 and h2 = â2, it should set prices P1 and P2 so that: Question 16 options: P1 = P2. 3P1 = 2P2. 2P1 = 3P2. 2/3P1 = 1/2P2. 2P1 = 2/3P2. Save Question 17 (1 point) Question 17 Unsaved Women are often charged more than men for haircuts performed by the same haircutter. This is not considered price discrimination because: Question 17 options: women receive more consumer surplus from haircuts than men receive. haircutters claim to spend more time on womenâs hair, raising the cost of the haircut to the firm. firms make up the extra cost to consumers by giving women free samples of products. men receive more consumer surplus from haircuts than women receive. women have a lower price elasticity of demand for haircuts. Save Question 18 (1 point) Question 18 Unsaved If price is above the average variable cost but below the average total cost of a representative firm in a competitive industry: Question 18 options: there will be entry to the industry over time. there will be exit from the industry over time. the firms in the industry are just earning a normal rate of return. the firms in the industry are earning a supranormal rate of return. the industry is in long-run equilibrium. Save Question 19 (1 point) Question 19 Unsaved Joeâs T-shirts has costs given by TC = $100 + 3Q, where Q is the number of shirts. If Joe charges $5 each, the percentage markup for 100 shirts is: Question 19 options: 20%. 25%. 33%. 50%. 67%. Save Question 20 (1 point) Question 20 Unsaved In the model of monopolistic competition, there can be short-run: Question 20 options: losses or profits, but there must be profits in long-run equilibrium. profits, but there must be losses in long-run equilibrium. losses or profits, but there must be losses in long-run equilibrium. losses or profits, but there must be neither profits nor losses in long-run equilibrium. losses, but there must be profits in long-run equilibrium.

ECON1102 Lecture Notes - Lecture 4: Xm Satellite Radio, Menu Cost, Exogeny

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