Mid-term考卷

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1、2010-2011年度中级经济学期中考试试卷学号：姓名：PartⅠ(TrueorFalse)1.5pointseach1.Iftheproductionfunctionisf(x,y)=min{2x+y,x+2y},thenthereareconstantreturnstoscale（规模收益不变）.2.Ifthevalueofthemarginalproductoffactorx（要素x的边际产量）increasesasthequantityofxincreasesandthevalueofthemarginalproductofx（要素x的边际产量值）isequal

2、tothewagerate,thentheprofit-maximizingamountofxisbeingused.3.Ifthepriceelasticityofdemand（需求价格弹性）foragoodis-1,thendoublingthepriceofthatgoodwillleavetotalexpendituresonthatgoodunchanged.4.Theaveragecostcurveisdecreasingwithproductionquantity,iftheproductiontechnologyisdecreasingreturnsto

3、scale.5.Ifpreferencesarequasilinear(拟线形),thentheslopeoftheEngelcurveforanygoodwilldecreaseasincomeincreases.6.Itispossibleforaconsumertosatisfytheweakaxiomofrevealedpreference（弱显示性偏好公理）butviolatethestrongaxiomofrevealedpreference.7.Ifsomebodyisbuying10unitsofxandthepriceofxfallsby$4,then

4、thatperson’snetconsumer’ssurplus（消费者剩余）mustincreasebyatleast$40.8.Iftheequationforthedemandcurveisq=50-4p,thentheratioofmarginalrevenue（边际收益）topriceisconstantaspricechanges.9.IfsomeonehastheutilityfunctionU=1,000+2min{x,y},thenxandyareperfectcomplements（完美互补）forthatperson.10.Apersonwitht

5、heutilityfunctionU(x,y)=y+x2hasconvexpreferences（凸性偏好）.PartⅡ(SingleChoice)2pointseach1.Ifasimultaneous（同时）andequalpercentage（同比例）decreaseintheuseofallphysicalinputsleadstoalargerpercentagedecreaseinphysicaloutput,afirm’sproductionfunctionissaidtoexhibita.decreasingreturnstoscale.b.consta

6、ntreturnstoscale.c.increasingreturnstoscale.d.diseconomiesofscale.2.Thepriceelasticityofdemandisthesamethingasthenegativeofthea.slope.b.reciprocalofslope.c.thefirstderivativeofthedemandfunction.d.reciprocalofslopetimestheratioofpricetoquantity.e.alloftheabove.3.Ifaprofit-maximizingfirm’s

7、marginalproductoflaborequals1tonofoutput,whilethemarginalproductofcapitalequals7tonsofoutputandtheuseofcapitalispricedat$14perunit,thena.thepriceoflabormustbe$2.b.thepriceoflabormustbe$7.c.thepriceoflabormustbe$14aswell.d.noneoftheaboveistrue.4.Mikeconsumestwocommodities,