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GT01003Macroeconomics
Learning Objectives1. Identify the key assumptions of the basic Keynesianmodel2. Explain how to develop a model of Planned...
Learning Objectives4. Show how a change in planned aggregate expenditurecan cause a change in the short-run equilibriumout...
John Maynard Keynes (1883 –1946) The idea that a decline in aggregatespending may cause output to fallbelow potential out...
Keynesian Model Building block for current theories of short-run economicfluctuations and stabilization policies In the ...
Keynesian ModelWill new technologies make the Keynesian theory lessrelevant to the real world?? Technology has reduced me...
New Technologies
New Technologies
New Technologies
Planned Aggregate Expenditure (PAE) Planned aggregate expenditure is planned spending onfinal goods and services Four co...
Planned Aggregate Expenditure (PAE) Actual spending equals planned spending for Consumption Government purchases of fin...
Develop a Model of PAE:Consumption Expenditures Consumption (C) accounts for two-thirds of totalspending Powerful determ...
Consumption, 1960 - 2007
Develop a Model of PAE:Consumption Function The consumption function is an equation relatingplanned consumption to its de...
Develop a Model of PAE:Consumption FunctionC = C + (mpc) (Y – T) The wealth effect is the tendency of changes in assetpri...
Develop a Model of PAE:Consumption FunctionC = C + (mpc) (Y – T) Marginal propensity to consume (mpc) is theincrease in c...
Develop a Model of PAE:Consumption FunctionDisposable income (Y – T)Consumptionspending(C)CC = C + (mpc) (Y – T)Δ (Y – T)Δ...
Planned Aggregate Expenditure(PAE) Two dynamic patterns in the economy1. Declines in production lead to reduced spending2...
Planned Spending ExamplePAE = C + IP + G + NXC = C + mpc (Y – T)PAE = C + mpc (Y – T) + IP + G + NX Suppose that planned ...
Planned Spending ExampleC = 620 + 0.8 (Y – 250)PAE = 960 + 0.8 Y If Y increases by $1, C will increase by $0.80 PAE incr...
Planned Expenditure GraphOutput (Y)Plannedaggregateexpenditure(PAE)960PAE = 960 + 0.8YSlope = 0.84,800
Short-Run Equilibrium Short-run equilibrium is the level of output at whichplanned spending is equal to output No change...
Short-Run Equilibrium SearchOutput (Y) PAE = 960 + 0.8 Y Y – PAE Y = PAE?4,000 4,160 –160 No4,200 4,320 –120 No4,400 4,480...
Short-Run Equilibrium GraphOutput (Y)Plannedaggregateexpenditure(PAE)960PAE = 960 + 0.8Y45oY = PAE4,800Slope = 0.8
Output Greater than Equilibrium Suppose output reaches5,000 Planned spending isless than total output Unplanned invento...
Output Less than Equilibrium Suppose output is only4,500 Planned spending ismore than totaloutput Unplanned inventoryde...
Planned Spending andthe Output GapOutput YPlannedaggregateexpenditure(PAE)960EPAE = 960 + 0.8Y45oY = PAE4,800Y*Recessionar...
Planned Spending andthe Output Gap Autonomous consumption, C, decreases by 10 Causes a downward shift in the planned agg...
Planned Spending andthe Output Gap Japanese recession in 1990s reduced Japanese imports East Asian economies developed b...
Planned Spending andthe Output Gap: US Recession 2001 Robust investment spending, 1995 – 2000 High growth economy New t...
Income-Expenditure Multiplier The income – expenditure multiplier shows the effectof a one-unit increase in autonomous ex...
Stabilization Policy Stabilization policies are government actions toaffect planned spending with the intention ofelimina...
Fiscal Policy and Recessions Government spending is part of planned spending Changes in government spending will directl...
How can the Government eliminatean Output Gap?Output YPlannedaggregateexpenditure(PAE)960PAE = 960 + 0.8Y45oY = PAEFPAE = ...
Example: Japanese Spending In the 1990s Japan spent over $1 trillion on publicworks Highways, subways, and transportatio...
Taxes and Transfers Planned aggregate expenditures are affected by taxesand transfers The effect is indirect, channeled ...
Fiscal Policy as a Stabilization Tool:Three Qualifications The use of fiscal policy to stabilize the economy ismore compl...
Spending and Output in the ShortRunShort-Run Spending and OutputPlannedAggregateExpenditures(PAE)ConsumptionFunctionShort-...
Fiscal policy
Fiscal policy
Fiscal policy
Fiscal policy
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  1. 1. GT01003Macroeconomics
  2. 2. Learning Objectives1. Identify the key assumptions of the basic Keynesianmodel2. Explain how to develop a model of Planned AggregateExpenditure (PAE)3. Analyze how an economy reaches short-runequilibrium in the basic Keynesian model Do the analysis with both numbers and graphs
  3. 3. Learning Objectives4. Show how a change in planned aggregate expenditurecan cause a change in the short-run equilibriumoutput Explain how this is related to the income-expendituremodel5. Explain why the basic Keynesian model suggests thatfiscal policy is useful
  4. 4. John Maynard Keynes (1883 –1946) The idea that a decline in aggregatespending may cause output to fallbelow potential output was one of thekey insights of John Maynard Keynes. The goal of this lecture is to present atheory/model of how recession andexpansion may arise fromfluctuations in planned aggregateexpenditure or total plannedspending.
  5. 5. Keynesian Model Building block for current theories of short-run economicfluctuations and stabilization policies In the short run, firms meet demand at preset prices Firms typically set a price and meet the demand at that pricein the short run Menu price is the cost of changing prices Determining the new price Incorporating prices into the business Informing consumers of new prices Firms change prices when the marginal benefits exceed themarginal costsKeyAssumption
  6. 6. Keynesian ModelWill new technologies make the Keynesian theory lessrelevant to the real world?? Technology has reduced menu costs Bar codes and scanners reduce costs of changing prices in the store Online surveys Highly segmented airline pricing Internet mechanisms for setting price eBay ■ Priceline Other costs remain Competitive analysis ■ Deciding the new prices Informing consumers
  7. 7. New Technologies
  8. 8. New Technologies
  9. 9. New Technologies
  10. 10. Planned Aggregate Expenditure (PAE) Planned aggregate expenditure is planned spending onfinal goods and services Four components of planned aggregate expenditure Consumption (C) by households Investment (I) is planned spending by domestic firmson new capital goods Government purchases (G) are made by federal stateand local governments Net exports (NX) is exports minus imports
  11. 11. Planned Aggregate Expenditure (PAE) Actual spending equals planned spending for Consumption Government purchases of final goods and services Net exports Adjustments between actual and planned spendingare accomplished with changes in inventories The general equation for planned aggregateexpenditures isPAE = C + IP + G + NX
  12. 12. Develop a Model of PAE:Consumption Expenditures Consumption (C) accounts for two-thirds of totalspending Powerful determinant of planned aggregate spending Includes purchases of goods, services, and consumerdurables, but not houses Rent is considered a service C depends on disposable income, (Y – T)
  13. 13. Consumption, 1960 - 2007
  14. 14. Develop a Model of PAE:Consumption Function The consumption function is an equation relatingplanned consumption to its determinants, notablydisposable income (Y – T)C = C + (mpc) (Y – T)where C is autonomous consumption spendingmpc is the change in consumption for a givenchange in (Y – T) Autonomous consumption is spending not related to thelevel of disposable income A change in C shifts the consumption function
  15. 15. Develop a Model of PAE:Consumption FunctionC = C + (mpc) (Y – T) The wealth effect is the tendency of changes in assetprices to affect households wealth and thisconsumption spending This effect is included in C C also captures the effects of interest rates onconsumption Higher rates increase the cost of using credit to purchaseconsumer durables and other items
  16. 16. Develop a Model of PAE:Consumption FunctionC = C + (mpc) (Y – T) Marginal propensity to consume (mpc) is theincrease in consumption spending when disposableincome increases by $1 mpc is between 0 and 1 for the economy If households receive an extra $1 in income, they spendpart (mpc) and save part (Y – T) is disposable income Output plus government transfers minus taxes Main determinant of consumption spending
  17. 17. Develop a Model of PAE:Consumption FunctionDisposable income (Y – T)Consumptionspending(C)CC = C + (mpc) (Y – T)Δ (Y – T)Δ CCInterceptSlope = Δ C / Δ (Y – T)slope
  18. 18. Planned Aggregate Expenditure(PAE) Two dynamic patterns in the economy1. Declines in production lead to reduced spending2. Reductions in spending lead to declines in productionand income Consumption is the largest component of PAE Consumption depends on output, Y PAE depends on Y
  19. 19. Planned Spending ExamplePAE = C + IP + G + NXC = C + mpc (Y – T)PAE = C + mpc (Y – T) + IP + G + NX Suppose that planned spending components have thefollowing valuesPAE = 620 + 0.8 (Y – 250) + 220 + 330 + 20PAE = 960 + 0.8 YC = 620 mpc = 0.8 T = 250IP = 220 G = 330 NX = 20
  20. 20. Planned Spending ExampleC = 620 + 0.8 (Y – 250)PAE = 960 + 0.8 Y If Y increases by $1, C will increase by $0.80 PAE increases by 80 cents Planned aggregate expenditure has two parts Autonomous expenditure, the part of spending thatis independent of output $960 in our example Induced expenditure, the part of spending thatdepends on output (Y) 0.8 Y in our example
  21. 21. Planned Expenditure GraphOutput (Y)Plannedaggregateexpenditure(PAE)960PAE = 960 + 0.8YSlope = 0.84,800
  22. 22. Short-Run Equilibrium Short-run equilibrium is the level of output at whichplanned spending is equal to output No change in output as long as prices are constant Our equilibrium condition can be writtenY = PAE Using our previous example, PAE = 960 + 0.8 YY = 960 + 0.8 Y0.2 Y = 960Y = $4,800
  23. 23. Short-Run Equilibrium SearchOutput (Y) PAE = 960 + 0.8 Y Y – PAE Y = PAE?4,000 4,160 –160 No4,200 4,320 –120 No4,400 4,480 –80 No4,600 4,640 –40 No4,800 4,800 0 Yes5,000 4,960 40 No5,200 5,120 80 No Only when Y = 4,800 does planned spending equaloutput
  24. 24. Short-Run Equilibrium GraphOutput (Y)Plannedaggregateexpenditure(PAE)960PAE = 960 + 0.8Y45oY = PAE4,800Slope = 0.8
  25. 25. Output Greater than Equilibrium Suppose output reaches5,000 Planned spending isless than total output Unplanned inventoryincreases Businesses slow downproduction Output goes downPAEOutput (Y)960PAE = 960 +0.8Y45oY = PAE4,800 5,000
  26. 26. Output Less than Equilibrium Suppose output is only4,500 Planned spending ismore than totaloutput Unplanned inventorydecreases Businesses speed upproduction Output goes upPAEOutput (Y)960PAE = 960 +0.8YY = PAE4,8004,700
  27. 27. Planned Spending andthe Output GapOutput YPlannedaggregateexpenditure(PAE)960EPAE = 960 + 0.8Y45oY = PAE4,800Y*Recessionary gapPAE = 950 + 0.8Y950F4,750
  28. 28. Planned Spending andthe Output Gap Autonomous consumption, C, decreases by 10 Causes a downward shift in the planned aggregateexpenditures curve The economy eventually adjusts to a new lower level ofequilibrium spending an output, $4,750 Suppose that the original equilibriumlevel, $4,800, represented potential output, Y* A recessionary gap develops Size of the recessionary gap is 4,800 – 4,750 = $50 Entire decrease is in Consumption spending Same process applies to a decrease in IP, G, or NX–
  29. 29. Planned Spending andthe Output Gap Japanese recession in 1990s reduced Japanese imports East Asian economies developed by promotingexports The decrease in exports to Japan decreased plannedaggregate expenditures in these countries The decrease in planned spending caused the economiesto contract to a new, lower level of planned spending andoutput Japan exported its recession to its neighbors US recessions have similar effects on its major tradingpartners
  30. 30. Planned Spending andthe Output Gap: US Recession 2001 Robust investment spending, 1995 – 2000 High growth economy New technologies: internet, fiber optics, geneticengineering Not as promising as anticipated Recession caused by a decline in autonomousspending Less investment in 2001 Terrorist attack 9/11 Travel spending decreased Recovery began 2002
  31. 31. Income-Expenditure Multiplier The income – expenditure multiplier shows the effectof a one-unit increase in autonomous expenditure onshort-run equilibrium output Previous example Initial planned expenditure = 960 + 0.8 Y New planned expenditure = 950 + 0.8 Y Equilibrium changed from $4,800 to $4,750 A $10 change in autonomous expenditures caused a $50change in output Multiplier = 5 The larger mpc, the greater the multiplier
  32. 32. Stabilization Policy Stabilization policies are government actions toaffect planned spending with the intention ofeliminating output gaps Expansionary policies increase planned spending Contractionary policies decrease planned spending Two major stabilization tools are fiscal policy andmonetary policy Fiscal policy uses changes in governmentspending, transfers, or taxes Monetary policy uses changes in the money supply
  33. 33. Fiscal Policy and Recessions Government spending is part of planned spending Changes in government spending will directly affect plannedaggregate expenditures Suppose planned spending decreases $ 10 fromY = 960 + 0.8 Y toY = 950 + 0.8 Y Equilibrium Y decreases from $4,800 to $4,750 Recessionary gap is $50 Stabilization policy indicates a $10 increase in governmentspending will restore the economy to Y* at $4,800
  34. 34. How can the Government eliminatean Output Gap?Output YPlannedaggregateexpenditure(PAE)960PAE = 960 + 0.8Y45oY = PAEFPAE = 950 + 0.8Y9504,750E4,800Y*
  35. 35. Example: Japanese Spending In the 1990s Japan spent over $1 trillion on publicworks Highways, subways, and transportation projects Concert halls Re-laying cobblestone sidewalks
  36. 36. Taxes and Transfers Planned aggregate expenditures are affected by taxesand transfers The effect is indirect, channeled through the effects ondisposable income Lower taxes or higher transfers increase disposableincome Increases in disposable income lead to higher C
  37. 37. Fiscal Policy as a Stabilization Tool:Three Qualifications The use of fiscal policy to stabilize the economy ismore complicated than suggested by the basicKeynesian model. Three qualifications must be made to the use of fiscalpolicy as a stabilization tool.1. Fiscal policy may affect potential output as well aspotential spending2. Large and persistent government budget deficitsreduce national saving and growth3. The relative inflexibility of fiscal policy
  38. 38. Spending and Output in the ShortRunShort-Run Spending and OutputPlannedAggregateExpenditures(PAE)ConsumptionFunctionShort-RunEquilibriumChanges inEquilibriumOutput GapsMultiplierFiscal PolicyLimitationsKeynesian Model
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