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e.impossibletotellfromthegraph
5.If,attheoptimalcombinationofinputsforproducing14,000unitsofoutput,themarginalproductofcapitalis40,whatisthemarginalproductoflabor?
a.60
b.40
c.27.67
d.80
6.Apublishinghouseisusing400printersand200printingpressestoproducebooks.Theprinters'
wagerateis$20andthepriceofaprintingpressis$100.Thelastprinteradded20bookstototaloutput,whilethelastprintingpressadded50bookstototaloutput.Thepublishinghouse
a.isusingthecostminimizingcombinationofprintersandprintingpresses.
b.shouldusemoreprintersbecausetheyarecheaperthanprintingpresses.
c.shouldusemoreprintingpressesbecausetheyaremoreproductivethanprinters.
d.couldproducethesamenumberofbooksatalowercostbyusingmoreprintingpressesandfewerprinters.
e.couldproducethesamenumberofbooksatalowercostbyusingmoreprintersandfewerprintingpresses.
7.Asofamanufacturercurrentlyisusing50workersand30machinestoproduce5,000sofasaday.Thewagerateis$200andtherentalrateforamachineis$1,000.Attheseinputlevels,anotherworkeradds200sofas,whileanothermachineadds200sofas.Ifthefirmuses49workersand31machinesinstead,thenits
a.costwillbeunchanged,anditsoutputwilldecreaseby500units.
b.costwillbeunchanged,anditsoutputwillincreaseby300units.
c.costwillbeunchanged,anditsoutputwillincreaseby500units.
d.outputwillbeunchanged,anditscostwillincreaseby$800.
8.Inthelongrun
a.allinputsarefixed.
b.afirmismakingtheoptimalinputchoicewhenthemarginalrateoftechnicalsubstitutionisequaltotheinputpriceratio.
c.theexpansionpathshowshowtheinputmarginalproductschangeasthefirm'
soutputlevelchanges.
d.bothaandb
e.noneoftheabove
Thenext3questionsrefertothefollowing:
9.AsyoumovefrompointAtopointB,
a.outputisunchanged.
b.costisunchanged.
c.therateatwhichthefirmcansubstitutelaborforcapitalwhileholdingoutputconstantdecreases.
d.bothaandb
e.bothaandc
Followingisafirm'
sexpansionpath.Thepriceofcapitalis$5perunit;
thepriceoflaboris$2perunit.
OptimalInputChoice
UnitsofOutput
10
20
30
UnitsofCapital
6
8
13
UnitsofLabor
5
10.Whenoutputis30units,whatislongruntotalcost?
a.$60
b.$105
c.$150
d.$260
11.Whenoutputis20units,whatislongrunaveragecost?
a.$2
b.$3.50
c.$4
d.$4.50
12.Economiesofscaleexistwhen
a.totalcostdecreasesasoutputincreases.
b.long-runaveragecostdecreasesasoutputincreases.
c.marginalcostdecreasesasoutputincreases.
d.fixedcostdecreasesasoutputincreases.
Answerkey:
BDACAEDBEBEB
Chapter8
课后练习11版2、3、6、9、11、13
一、intheblanksinthetablebelowandanswerthenext4questions:
Total
Product
AverageProduct
MarginalProduct
1
3
4
5
6
7
____
66
78
16
1．Intheabovetable,theaverageproductoflaborwhen4unitsoflaborareemployedis
a.22.
b.20.
c.19.
d.16.
2.Intheabovetable,themarginalproductofthefifthunitoflaboris
a.16.
b.10.
c.4.
d.2.
3.Intheabovetable,diminishingreturnsbeginwiththe
a.firstunitoflabor.
b.thirdunitoflabor.
c.fourthunitoflabor.
d.sixthunitoflabor.
4.Intheabovetable,marginalproductisnegativewhen_____unitsoflaborareemployed.
a.5unitsoflaborareemployed.
b.6unitsoflaborareemployed.
c.7unitsoflaborareemployed.
d.bothbandc.
5.Supposeyourunapizzashopandcurrentlyhavetwoemployees.Ifyouhireathirdemployee,youroutputofpizzasperdayrisesfrom55to65.Ifyouhireafourthemployee,outputrisesto80perday.Afifthandsixthemployeewouldcauseoutputtoriseto90and95perday,respectively.Pickthecorrectstatement:
a.Diminishingreturnssetinwiththehiringofthefourthworker.
b.Diminishingreturnssetinwiththehiringofthefifthworker.
c.Diminishingreturnssetinwiththehiringofthesixthworker.
d.Diminishingreturnssethavenotyetsetinbecauseoutputisstillincreases.
Thenext6questionsrefertothefollowing:
Output
TotalCost
0
50
100
150
200
$300
800
1050
1650
2400
6.Whatistotalvariablecostwhen100unitsofoutputareproduced?
a.$5
b.$10.50
c.$105
d.$1050
7.Whatisaveragefixedcostwhen150unitsofoutputareproduced?
b.$9
c.$11
d.$16.50
8.Whatisaveragevariablecostwhenoutputis200?
a.$2.00
b.$12.00
c.$10.50
d.$240
e.$210
questionsrefertothefollowing:
Thefollowinggraphshowsthemarginalandaverageproductcurvesforlabor,thefirm'
sonlyvariableinput.Thewageforlaboris$2,800.Fixedcostis$160,000.
9.Atwhatoutputdoesthefirmreachminimumaveragevariablecost?
a.7,400
b.8,000units
c.100units
d.6,000
e.600
10.WhatisAVCatitsminimum?
a.$80
b.$100
c.$8
d.$50
e.$35
11.Whenthefirmuses40unitsoflabor,howmuchoutputdoesitproduce?
a.1,600units
b.400units
c.4,000units
d.2,800units
12.Whenthefirmuses40unitsoflabor,whatisAVCatthislevelofoutput?
a.$120
b.$400
c.$40
d.$70
e.$86
13.Whenthefirmuses40unitsoflabor,whatisaveragetotalcostatthisoutput?
a.$140
b.$40
c.$70
d.$170
CCBDBEACBEADD
Chapter6
11版1、2、6、10、12、15
Thenext8questionsrefertothefollowingtableshowingademandschedule:
Price
Quantitydemanded
$200
1000
150
1400
100
1800
1.Ifpricefallsfrom$200to$150,whatistheelasticityofdemandoverthisrange?
a.0.625
b.1.0
c.1.17
d.2.5
e.3.0
2．Asoutputincreasesfrom1,000to1,400whatismarginalrevenue?
a.$25
b.$50
c.–$400
d.$25
e.$75
3.Ifpricefallsfrom$200to$150,
a.arrowsrepresentingthepriceandquantityeffectsbothpointdown.
b.anarrowrepresentingthepriceeffectpointsdownandislongerthananarrowforthequantityeffect.
c.anarrowrepresentingthepriceeffectpointsdownandisshorterthananarrowforthequantityeffect.
d.arrowsrepresentingthepriceandquantityeffectsbothpointup.
e.totalrevenuemovesinthesamedirectionasthearrowrepresentingthepriceeffect.
Thennextfewquestionsrefertothefollowingfigure:
4.Whenpriceis$15andquantitydemandedis1,000,whatisthepointelasticityofdemand?
a.3
b.1/3
c.1
d.5
e.2/3
5..Whatistheequationformarginalrevenue?
a.MR=4,0000.005P
b.MR=4,000200Q
c.MR=4,000200P
d.MR=200.01Q
e.MR=20200Q
6.Whenquantitydemandedis1,000,whatismarginalrevenue?
a.$15
b.$7.50
c.0
d.$10
e.$10
7.Usethefiguretocalculatetheincomeelasticityofdemandwhenincomeincreasesfrom$25,000to$30,000:
a.1.0
b.0.1818
c.0.1818
d.1.5
e.1.2
8.Ifthequantityofgidgetsdemandedincreaseswhenthepriceofgadgetsdecreases
a.gidgetsandgadgetsaresubstitutes.
b.gidgetsandgadgetsarecomplements.
c.gidgetsarenormalgoods,whilegadgetsareinferiorgoods.
d.gadgetsarenormalgoods,whilegidgetsareinferiorgoods.
9.ThedemandforgoodXwillbemoreelasticthanthedemandforgoodYwhen
a.goodXhasfewersubstitutesthangoodY.
b.goodXaccountsforalargerpercentageofatypicalconsumer'
sbudgetthangoodY.
c.consumershavemoretimetoadjusttoachangeinthepriceofgoodXthantheyhavetimetoadjusttoachangeinthepriceofgoodY.
d.bothbandc
e.alloftheabove
10.ThepointelasticitiesofdemandforD1,D2,andD3atapriceof$5are________,________,and_______,respectively.
a.1.4;
0.2;
1.4
b.0.71;
5;
0.71
c.1.4;
d.12;
6;
12
e.0.0833;
0.1667;
0.0833
11.AtwhatpricesaredemandcurvesD1,D2,andD3unitaryelastic?
a.$5;
$5;
respectively
b.$17;
$6;
c.$6;
$3;
d.$1;
$1;
cacaddabdbc
Chapter2
11版6、11、12、14、15、17
1.Whichofthefollowingwouldincreasethesupplyofcorn?
a.anincreaseinthepriceofpesticides（杀虫剂）
b.adecreaseinthedemandforcorn
c.afallinthepriceofcorn
d.aseveredrought（严重干旱）inthecornbelt
e.adecreaseinthepriceofwheat
2.WhenSonomaVineyardsreducesthepriceofitsCabernetSauvignonfrom$15abottleto$12abottle,theresultisanincreasein
a.thedemandforthiswine.
b.thesupplyofthiswine.
c.thequantityofthiswinedemanded.
d.thequantityofthiswinesupplied.
Usethefollowinggenerallineardemandrelationtoanswerquestions36through41:
wherePisthepriceofgoodX,Misincome,and
isthepriceofarelatedgood,R.
3.
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