Barro_宏观经济学(5th)_课后习题答案

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1、ExerciseforMacroeconomicsTRUE/FALSE1•Thestandardoflivingofpeopleinacountryistheirpercapitaincome.2.Diminishingreturnstolaborimpliesthateventuallythemarginalproductoflaborwillbecomenegative・3.Themarginalproductofcapitalishowmuchoutputchangeswhencapitalincreasesbyoneunit.4.Sa

2、vingisincomethatisnotconsumed.5・Realsavingequalsgrossinvestment.MULTIPLECHOICE1.Worldgrowthdatashowsthatfrom1960to2000:a.theUSandotherOECDcountriesgrewatc.moderaterates.b.sub-SaharanAfricancountriesgrewatd.lowratesordeclined.somecountriesparticularlyEastAsiancountriesgrewra

3、pidly.alloftheabove.2.Worldgrowthdatarevealsthatfrom1960to2000:a.theUSandotherOECDcountriesgrewatc・moderaterates.b.sub-SaharanAfricancountriesgrewd.rapidly.somecountriesparticularlyEastAsiancountriesgrewalowratesordeclined,alloftheabove・3.Worldgrowthdatarevealsthatfrom1960t

4、o2000:a.lheUSandotherOECDcountriesc.stagnated.b.sub-SaharanAfricancountriesgrewatlowd.ornegativerates.somecountriesparticularlyEastAsiancountriesgrewatlowornegativerates,alloftheabove.4.WorldgrowthdatarevealsthatfromI960to20()():a.allcountriesgrewatsimilarrates・b.sub-Sahara

5、nAfricancountriesgrewmoderately.c.somecountriesparticularlyEastAsiancountriesgrewrapidly.d.theUSandotherOECDcountriesstagnated.5.TheUSandotherOECDcountrieshadhighlevelsofGDPperpersonin2000despitegrowingatamoderateratefrom1960to2000because:a.ofexploitationofforeigncountries・

6、c.theystolethewealthoflessdevelopedcountries.b.theireconomieshadgrownatamoderated・alloftheabove.rateforacenturyormore.6.IfAintheproductionfunctionY=A•F(K,L)rises,then:a.outputrisesforanylevelofKandL.b.themarginalproductoflaborrises.c.themarginalproductofcapitalrises.d.allof

7、theabove・7.AintheproductionfunctionY=A•F(K,L)a.themarginalproductoflabor.b.thecapitaltolaborratio(K/L).&Themarginalproductoflaboris:a.howmuchoutputrisesforwhenlaborincreasesoneunit・b.capitaldividedbylabor(K/L).9.Themarginalproductofcapitalis:a.Y｛比.b.thechangeinoutputforaun

8、itchangecapital.c.themarginalproductofcapital.d.theleveloftechnology.c.labordivide