Introduction to CGE.pdf

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1、IntroductiontoComputableGeneralEquilibriumModel(CGE)DhaznGillig&BruceA.McCarlDepartmentofAgriculturalEconomicsTexasA&MUniversity1CourseOutline¢OverviewofCGE¢AnIntroductiontotheStructureofCGE¢AnIntroductiontoGAMS¢CastingCGEmodelsintoGAMS¢DataforCGEModels&Calibration¢Incorporatingat

2、rade&abasicCGEapplication¢Evaluatingimpactsofpolicychangesandcastingnestedfunctions&atradeinGAMS¢MixedComplementaryProblems(MCP)2ThisWeek’sRoadMap¢IncorporatingasimpletraderelationshipinaCGEmodel¢SAMinGAMS¢CalibrationinGAMS¢BasicCGEapplication(Shoven&Whalley)3IncorporatingTrade–mo

3、dificationstoabasicCGEmodel¢BasicrelationshipsforasimpleCGEmodel1.Supply–Demand2.Zeroprofitcondition3.Factordemandbyproducers4.Productdemandbyhouseholds5.Incomebalanceconstraintforhouseholds6.Governmentbalance7.TradeBalanceassumption:-Smallopen-economy-Onlygoodsaretradable.-Goodsa

4、rehomogenousacrosscountries(ignoretheCETandARMINGTONapproachesfornow)4IncorporatingTrade–modificationstoabasicCGEmodel1.Thecommoditymarketbalance0≤P^j∑Xjh+∑aj,j1Qj1−Qj+sjR/Pjhj1+QExpj−QImpj≤0∀j2.Thefactormarketbalance=>nochange(assumingnotradeonfactors)3.Theprofitcondition=>nochan

5、ge4.Thehouseholdincomeequation=>nochange5IncorporatingTrade–modificationstoabasicCGEmodel5.Thegovernmenttaxrevenuebalance0≤R^R≤∑tjPjQj−∑th(WLLh+WKKh−Fh)jh+∑(tWL+tWK)ljLjkjKjj+∑tExpjQExpjPj+∑tImpjQImpjPjj∈exj∈im6IncorporatingTrade–modificationstoabasicCGEmodel6.Thedomestic(US)trade

6、priceequationsExports:0≤PWExp^jPExp≤(PWExp×Exchange)−TransCost∀j∈exjjImports:0≤PWImp^jPImp≤(PWImp×Exchange)+TransCost∀j∈imjj7IncorporatingTrade–modificationstoabasicCGEmodel7.Thedomestic(US)tradequantityequationsExports:0≤QExp^jQExp≤f(PWExp,ε)∀j∈exjjwhereeandmarepriceelasticitiesI

7、mports:-INFpricereceivedbydomesti

8、cproducersfromexportsNOT=fromdome