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2.3communityindifferencecurve一國(guó)的需求：社會(huì)無(wú)差異曲線Chapter2TheToolsinMicroPartofInternationalEconomicsSofar,wehavediscussedproduction,orsupplyasre?ectedinitsproductionpossibilitiesfrontier.Wenowintroducethetastes,ordemandpreferences,inanation.Individualindifferencecurverepresentseachindividualwell-beingfromconsumingvariousgoodsandservices,andtheactualconsumptionpointchosenbytheindividualdependsonthebudgetconstraint.Givenabudgetconstraint,theindividualchoosesconsumptiontobeaswelloffaspossible-toreachthehighestfeasibleindifferencecurve.11.11iscoming吳亦凡andPharrellWilliams:《Double11Day》插入音頻TmallandAmazonArtificialshoppingcarnivalistopromotesale.CommunityindifferencecurveHowtoportrayanentirenationdecisiononconsumptionquantitiesandwhatdecisionimpliesfortheeconomicwell-beingofthenationasawhole?Individualindifferencecurveisusefulasatoolforouranalysis.Theoretically,weaddtheindividualindifferencecurvestogether,andgetacommunityindifferencecurves.Wewillutilizecommunityindifferencecurvestoshowtheeconomicwell-beingofawholegroup.Acommunityindifferencecurveshowsthevariouscombinationsoftwocommoditiesthatyieldequalsatisfactiontothecommunityornation.Tobeuseful,theymustnotcross.CommunityIndifferenceCurvesforNation1andNation2.Highercurvesrefertogreatersatisfaction.Lowercurvestolesssatisfaction.Themovementofindifferencecurvemeansimprovementordeterioration.Communityindifferencecurvesarenegativelyslopedandconvexfromtheorigin.Thedecliningslopeofthecurvere?ectsthediminishingmarginalrateofsubstitution(MRS)ofXforYinconsumption.Themarginalrateofsubstitution(MRS)ofXforYinconsumptionreferstotheamountofYthatanationcouldgiveupforoneextraunitofXandstillremainonthesameindifferencecurve.ThedeclineinMRSorabsoluteslopeofanindifferencecurveisare?ectionofthefactthatthemoreofXandthelessofYanationconsumes,themorevaluabletothenationisaunitofYatthemargincomparedwithaunitofX.Therefore,thenationcangiveuplessandlessofYforeachadditionalunitofXitwants.TheconsumptionpointThesatisfactionisrestrictedbydisposableincome.

RevenuebudgetlineI=PxX+PyYToconsumer,theirtargetistomaximizesatisfaction,itwillattempttoconsumesomecombinationofgoodsonthehighestindifferencecur

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