曼昆微观经济学复习题.ppt

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1、Exercises1.SupposeBart,Benjamin,andBrenteachpurchaseaparticulartypeofelectricpencilsharpeneratapriceof$20.Bart’swillingnesstopaywas$22,Benjamin'swillingnesstopaywas$25,andBrent'swillingnesstopaywas$30.Whichofthefollowingstatementsiscorrect?a.Hadthepriceofthe

2、pencilsharpenerbeen$26ratherthan$20,onlyBrentwouldhavebeenabuyer.b.Brent’sconsumersurplusisthesmallestofthethreeindividualconsumersurpluses.c.Forthethreeindividualstogether,consumersurplusamountsto$60.d.Thefactthatallthreeindividualspaid$20forthesametypeofpe

3、ncilsharpenerindicatesthateachoneplacedthesamevalueonthatpencilsharpener.2.Ifthequantitysuppliedisthesameregardlessofprice,thensupplyisa.elastic.b.perfectlyelastic.c.perfectlyinelastic.d.inelastic.3.Whenthereisashortageof100unitsofaparticulargood,a.thelawofs

4、upplypredicts(预报）upwardpressureonthepriceofthegoodfromitscurrentlevel.b.thelawofdemandpredictsdownwardpressureonthepriceofthegoodfromitscurrentlevel.c.wesaythatthereisascarcityof100unitsofthegood.d.Noneoftheaboveiscorrect.4.Anincreaseinthenumberofcollegescho

5、larships(奖学金）issuedbyprivatefoundationswoulda.increasethesupplyofeducation.b.decreasethesupplyofeducation.c.increasethedemandforeducation.d.decreasethedemandforeducation.5.Nationaldefense（国防）isprovidedbythegovernmentbecausea.itisimpossibleforprivatemarketsto

6、producepublicgoods.b.productsprovidedbythegovernmentareproducedmoreefficiently.c.free-ridersmakeitdifficultforprivatemarketstosupplythesociallyoptimalquantity.d.publicgoodsincreasegovernmentrevenues.6.Averagetotalcostisveryhighwhenasmallamountofoutputisprodu

7、cedbecausea.averagevariablecostishigh.b.averagefixedcostishigh.c.marginalcostishigh.d.marginalproductishigh.7.Supposeafirminacompetitivemarketreceived$1,000intotalrevenueandhadamarginalrevenueof$10forthelastunitproducedandsold.Whatistheaveragerevenueperunit,

8、andhowmanyunitsweresold?a.$5and50b.$5and100c.$10and50d.$10and1008.Letthedemandandsupplyforagoodbegivenbyqd=1600−38pqs=2p+400Whatistheequilibriumquantityandprice?Solution：qd=qs1600−38p=2p+400Solv