问题标题：
【Asmallcountrycanimportagoodataworldpriceof10perunit.ThedomesticsupplycurveofthegoodisS=50+5P,ThedemandcurveisD=400-10P,Inaddition,eachunitofproductionyieldsamarginalsocialbenefitof10.a.Calculatethetotaleffecto】
问题描述：
Asmallcountrycanimportagoodataworldpriceof10perunit.ThedomesticsupplycurveofthegoodisS=50+5P,ThedemandcurveisD=400-10P,Inaddition,eachunitofproductionyieldsamarginalsocialbenefitof10.
a.Calculatethetotaleffectonwelfareofatariffof5perunitleviedonimports.
b.Calculatethetotaleffectofaproductionsubsidyof5percent.
c.Whydoestheproductionsubsidyproduceagreatergaininwelfarethanthetariff?
d.Whatwouldtheoptimalproductionsubsidybe?
顾周聪回答：
答：a.Nationalwelfareofatariff5perunit:e－(b+d)=250－(62.5+125)=62.5b.Nationalwelfareofaproductionsubsidy5perunit:e－b=250－62.5=187.5c.Productionsubsidyisconformwiththe“...
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