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Part4
TheEconomyintheShortRun:BusinessCycleTheory
II.InteractionbetweenMoneyMarketandGoodsMarket:IS-LMModel(Ch.10)
McGraw-Hill/IrwinCopyright?2001byTheMcGraw-HillCompanies,Inc.Allrightsreserved.1.AggregateDemandandEquilibriumOutput1.1EquilibriumOutputAD(PE)=C+I+G+NX,whereNX=X-MOutputisinequilibriumifitsatisfies:Y=AD(PE)=C+I+G+NX
McGraw-Hill/IrwinCopyright?2001byTheMcGraw-HillCompanies,Inc.Allrightsreserved.WedefinetheexcessofYoverADasunplannedinventoryinvestment(ordisinvestment),denotedbyIU:IU=Y–AD1.2ConsumptionandAggregateDemandDeterminantsofconsumption:ePricelevelInterestrate
McGraw-Hill/IrwinCopyright?2001byTheMcGraw-HillCompanies,Inc.Allrightsreserved.ConsumptionasafunctionoftotaloutputC=C+cYSavingisalsoafunctionoftotaloutput.S=Y–C=-C+(1-c)YMeaningofc:MPC=△C/△YC----autonomousconsumptione10002000300040005000Consumption11002000280037004400marginalpropensitytoconsume0.90.80.70.4
McGraw-Hill/IrwinCopyright?2001byTheMcGraw-HillCompanies,Inc.Allrightsreserved.AggregatedemandAD=C+c(Y–TA+TR)+I+G+NX=C-c(TA–TR)+I+G+NX+cY=A+cY1.3.EquilibriumOutput(TheKeynesianCross)Y=C+I+G+NXC=C+c(Y-TA+TR)1Y=——·1-c(C+I+G+NX-cTA+cTR)A=——1-c
McGraw-Hill/IrwinCopyright?2001byTheMcGraw-HillCompanies,Inc.Allrightsreserved.THECONSUMPTIONFUNCTIONANDAGGREGATEDEMAND
McGraw-Hill/IrwinSource:HaverAnalyticsMacroeconomicDatabaseRELATIONSHIPOFTOTALCONSUMPTIONTODISPOSABLEINCOME
McGraw-Hill/IrwinCopyright?2001byTheMcGraw-HillCompanies,Inc.Allrightsreserved.DETERMINATIONOFEQUILIBRIUMINCOMEANDOUTPUT
McGraw-Hill/IrwinCopyright?2001byTheMcGraw-HillCompanies,Inc.Allrightsreserved.Conclusion:determinantsofequilibriumoutputMPCAutonomoussp
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