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CHAPTER2NATIONALINCOMEACCOUNTINGCHAPTEROUTLINEREALANDNOMINALGDPTHECOMPOSITIONOFGDPTHEVALUEADDEDNATIONALINCOMEIDENTITIESPRICEINDEXESCOREINFLATIONTHEUNEMPLOYMENTRATEEXCHANGERATESREALANDNOMINALINTERESTRATESCHANGESFROMTHEPREVIOUSEDITIONTHEBASICSTRUCTUREOFTHISCHAPTERISUNCHANGEDALLFIGURESANDTABLESHAVEBEENUPDATEDANDBOX23HASBEENREVISEDSECTION25NOWINCLUDESAPARAGRAPHONCOREINFLATIONANDMAKESREFERENCETOTHEPERSONALCONSUMPTIONEXPENDITUREDEFLATORINTRODUCTIONTOTHEMATERIALCHAPTER2EXAMINESTHEMEANINGOFGROSSDOMESTICPRODUCTGDP,THEBASICMEASUREOFANATIONSECONOMICPERFORMANCETHEDIFFERENCEBETWEENGROSSDOMESTICPRODUCTGDPANDGROSSNATIONALPRODUCTGNPARISESSINCEPARTOFACOUNTRYSOUTPUTISPRODUCEDBYFOREIGNOWNEDFACTORSOFPRODUCTIONTHISDIFFERENCEISFAIRLYSMALLFORTHEUS,BUTITISIMPORTANTTOSTRESSTHISDISTINCTION,SINCEINSOMEOTHERCOUNTRIES,SUCHASIRELANDANDSWITZERLAND,THEDIFFERENCEISSUBSTANTIALGNPISALSOSOMETIMESCALLEDGNI,THATIS,GROSSNATIONALINCOMEEXPLAININGGDPINTERMSOFFACTORPAYMENTSWILLHELPINTHESTUDYOFAGGREGATESUPPLYANDECONOMICGROWTHTHEAGGREGATEPRODUCTIONFUNCTIONSHOWSTHEFACTORSOFPRODUCTIONINPUTS,SUCHASLABORANDCAPITALTHATCONTRIBUTETOTHEPRODUCTIONOFFINALGOODSANDSERVICESOUTPUTDIVIDINGGDPINTOITSFOURMAINSPENDINGCOMPONENTSCONSUMPTIONC,INVESTMENTI,GOVERNMENTPURCHASESGANDNETEXPORTSNXWILLHELPINTHESTUDYOFAGGREGATEDEMANDTHEUSEOFNATIONALINCOMEIDENTITIESINTHISCHAPTERPROVIDESABASICUNDERSTANDINGOFTHERELATIONSHIPBETWEENIMPORTANTMACROECONOMICVARIABLESDISCUSSINGTHESEIDENTITIESALLOWSINSTRUCTORSTOPOINTOUTTHEAMBIGUITIESINCAUSEANDEFFECTTHATAREOFTENPRESENTINMACROECONOMICSTHISISESPECIALLYTRUEWHENITCOMESTOTHERELATIONSHIPBETWEENPRIVATEDOMESTICSAVING,PRIVATEDOMESTICINVESTMENT,THEBUDGETSURPLUS,ANDTHETRADESURPLUSANINDEPTHDISCUSSIONOFTHESERELATIONSHIPSWILL,OFCOURSE,HAVETOBEDELAYEDUNTILLATERNONETHELESS,STUDENTSWILLFINDITEXCITINGANDMOTIVATINGTOSEETHATEVENTHESIMPLEEQUATIONSPRESENTEDHERECANBEUSEDTOADDRESSSOMERATHERCOMPLEXREALWORLDPROBLEMSITISPARTICULARLYIMPORTANTTOPOINTOUTTHATTHEFOLLOWINGTWOEQUATIONSYCIGNXANDSIGTRTANXARETREATEDASNATIONALINCOMEIDENTITIESHEREBUTWILLALSOBEUSEDASEQUILIBRIUMCONDITIONSINLATERCHAPTERS,WITHTHESECONDEQUATIONSLIGHTLYREDEFINEDITISNOTALWAYSEASYTOMEASUREINFLATIONARYTRENDSACCURATELY,ESPECIALLYSINCETHEPRICESOFSOMEGOODSCANBEVOLATILETHEREFOREPOLICYMAKERSOFTENLOOKATTHETRENDOFCOREINFLATION,WHICHEXCLUDESENERGYANDFOODPRICESALTERNATIVEMEASURESOFINFLATION,SUCHASTHEGDPDEFLATOR,THECONSUMERPRICEINDEXCPI,THEPERSONALCONSUMPTIONEXPENDITUREDEFLATORPCE,ANDTHEPRODUCERPRICEINDEXPPI,AREDISCUSSED,ALONGWITHSOMEOFTHEPROBLEMSTHATCOMEWITHMEASURINGINFLATIONABRIEFDISCUSSIONOFTHEUSEFULNESSANDSHORTCOMINGSOFTHESEDIFFERENTMEASURESOFINFLATIONSHOULDPOINTOUTWHYTHEPRICEINDEXESDONOTALWAYSCHANGEATTHESAMERATEEVENTHOUGHTHEIRRATESOFCHANGEOVERLONGTIMESPANSTENDTOBEFAIRLYSIMILARTHEPPIMEASURESPRICEINCREASESATANEARLYSTAGEOFPRODUCTIONFROMAMARKETBASKETTHATINCLUDESRAWMATERIALSANDSEMIFINISHEDGOODSTHECPIMEASURESTHEAVERAGEPRICEINCREASEOFAMARKETBASKETOFGOODSANDSERVICESTHATANAVERAGEURBANHOUSEHOLDMIGHTCONSUMETHEPERSONALCONSUMPTIONEXPENDITUREDEFLATORPCEISACHAINWEIGHTEDINDEXMEASURINGINFLATIONINCONSUMERPURCHASES,BASEDONTHECONSUMERSECTOROFTHENATIONALINCOMEACCOUNTTHEGDPDEFLATORISTHEMOSTCOMPREHENSIVEMEASUREANDINCLUDESALLGOODSANDSERVICESCURRENTLYPRODUCEDWITHINACOUNTRYUNFORTUNATELY,EARLYESTIMATESOFGDPANDTHUSTHEGDPDEFLATORTENDTOBEFAIRLYUNRELIABLEDUETOMEASUREMENTPROBLEMSANOTHERMEASURETHATCANGIVEANINDICATIONOFHOWWELLANATIONISPERFORMINGECONOMICALLYISTHEUNEMPLOYMENTRATE,THATIS,THEFRACTIONOFTHELABORFORCETHATISCURRENTLYOUTOFWORKBUTACTIVELYLOOKINGFORAJOBORWAITINGTOBERECALLEDFROMALAYOFFTHEDISTINCTIONBETWEENREALANDNOMINALINTERESTRATESISALSOVERYIMPORTANTNOMINALINTERESTRATESREPRESENTTHEACTUALRATEOFRETURNONFINANCIALINSTRUMENTSASTHEYARESTATEDINTHENEWSPAPERSHOWEVER,AFINANCIALINVESTORSHOULDBEINTERESTEDMUCHMOREINTHEREALRATEOFRETURN,THATIS,THESTATEDINTERESTRATEADJUSTEDFORINFLATIONVERYFEWFINANCIALINSTRUMENTSGUARANTEEAREALRATEOFRETURNANDTHEUSGOVERNMENTHASONLYRECENTLYSTARTEDTOISSUEINFLATIONINDEXEDGOVERNMENTBONDSFINANCIALINVESTORSSEEKINGGOODYIELDSFROMFOREIGNSECURITIESALSOHAVETOPAYATTENTIONTOTHEEXCHANGERATE,THATIS,THEPRICEPAIDTOBUYFOREIGNCURRENCYWHILEANINDEPTHDISCUSSIONOFTHEIMPORTANCEOFEXCHANGERATESWILLHAVETOBEDELAYED,INSTRUCTORSSTILLMAYWANTTOPOINTOUTFIGURE27,THATSHOWSANINVERSERELATIONSHIPBETWEENTHEGDPDEFLATORANDTHEVALUEOFTHEUSDOLLARASITBECOMESINCREASINGLYIMPORTANTFORSTUDENTSTOKNOWHOWTOACCESSSTATISTICALDATATHATAREUSEFULININTERPRETINGTHEPERFORMANCEOFTHEECONOMY,SECTION29PROVIDESSOMELINKSFOROBTAININGDATAANDSTUDENTSSHOULDBEENCOURAGEDTOMAKEUSEOFTHEMSUGGESTIONSFORLECTURINGINSTRUCTORSSHOULDSTARTTHISCHAPTERBYGIVINGSTUDENTSTHEEXACTDEFINITIONOFGDPASTHEMARKETVALUEOFALLFINALGOODSANDSERVICESCURRENTLYPRODUCEDWITHINACOUNTRYINAGIVENTIMEPERIODUSUALLYAYEAR,ANDTHENASKINGTHEMTOEXPLAINHOWCERTAINEVENTSMAYAFFECTGDPFORSUGGESTIONSLOOKUNDER“ADDITIONALPROBLEMS“BELOWINDISCUSSINGTHECONCEPTOFGDP,INSTRUCTORSSHOULDMAKEITCLEARTHATEARLYDATAREPORTSONGDPTENDTOBEUNRELIABLE,SINCEMUCHOFTHEDATAUSEDTOPREPARETHEMISBASEDONESTIMATESRATHERTHANDIRECTMEASUREMENTINADDITION,SOMEDATA,SUCHASUNREPORTEDACTIVITY,MAYNEVERENTERTHEGDPFIGUREESTIMATESOFHOWMUCHACTUALECONOMICACTIVITYCANNOTBEMEASUREDINTHEOFFICIALGDPFIGUREFORTHEUSVARYFROM3TOOVER30,ANDTHEPERCENTAGEMAYBEEVENHIGHERFORDEVELOPINGCOUNTRIESADISCUSSIONOFTHEUNDERGROUNDECONOMYISALWAYSOFINTERESTTOSTUDENTSTHEFACTTHATSOMEOFTHEESTIMATESAREBASEDONCURRENCYHOLDINGSSEEMSREASONABLETOTHEM,SINCETHEYAREQUITEAWAREFROMWATCHINGMOVIESTHATMANYILLEGALTRANSACTIONSFOREXAMPLE,THOSEINVOLVINGILLEGALDRUGSREQUIRELARGESUMSOFCASHHOWEVER,FEWOFTHEMWOULDSUSPECTTHATMANYBUSINESSESTHATREQUIRECASHPAYMENTSFORTHEIRGOODSANDSERVICESMIGHTALSOUNDERREPORTTHEIRINCOMETOAVOIDTAXESADISCUSSIONOFWHETHERTHEVOLUNTEERSERVICESOFACANDYSTRIPERORTHESERVICESPROVIDEDBYAHOMEMAKERINRAISINGHISORHERCHILDRENSHOULDBECOUNTEDINTHEOFFICIALMEASUREMENTOFGDPWILLALSOPROVETOBEVERYSTIMULATINGWHENASKEDTOGIVEESTIMATESOFTHECURRENTGDPORTHEPROPORTIONSOFITSMAINCOMPONENTSCONSUMPTION,INVESTMENT,GOVERNMENTPURCHASESANDNETEXPORTSSTUDENTSOFTENGIVEVALUESFARFROMTHOSEINDICATEDINTABLE21FIGURE21ALSODESERVESSOMEATTENTIONSINCEITSHOWSNOTONLYTHESEFOURCOMPONENTSASPERCENTAGEOFGDP,BUTALSOTHEPAYMENTSTOTHEFACTORSOFPRODUCTIONASPERCENTAGESOFGDPTHISCANLEADTOAUSEFULDISCUSSIONOFTHEEXPENDITUREAPPROACHVERSUSTHEVALUEADDEDAPPROACHTOCALCULATINGGDPADISCUSSIONOFACTUAL,POTENTIAL,REALANDNOMINALGDP,THEGDPDEFLATOR,THECPIANDTHEPPICANBEINCORPORATEDINTOTHEDISCUSSIONOFOTHERIMPORTANTECONOMICINDICATORSRELATINGTHEDISCUSSIONOFECONOMICINDICATORSTOCURRENTNEWSREPORTSONECONOMICISSUESMAYPROVETOBEVERYINTERESTINGTOSTUDENTSINSTRUCTORSWHOCHOOSETODEVOTESOMETIMETOTHEDISCUSSIONOFECONOMICINDICATORSINCHAPTER1MAYFINDITHELPFULTOASSIGNCHAPTER2SIMULTANEOUSLYFAMILIARITYWITHACTUALECONOMICDATAISOFTENLACKINGINTODAYSSTUDENTS,ANDTHEREFORETASKSTHATINVOLVELOOKINGUPECONOMICDATAAREESPECIALLYWORTHWHILEASNOTEDEARLIER,THEWEBSITESLISTEDINSECTION29AREVERYUSEFULINTHISREGARDAWORTHWHILEASSIGNMENTREQUIRINGADATASEARCHISTOASKSTUDENTSTOMAKEACOMPARISONBETWEENTHEPERFORMANCEOFTHEUSECONOMYANDTHATOFANOTHERCOUNTRYOFTHEIRCHOICESOMETIMESHOULDBESPENTONTHEDISCUSSIONOFTHEDIFFERENCESBETWEENTHEGDPDEFLATOR,THEPCE,THECPI,ANDTHEPPI,ANDTHEIRRESPECTIVEUSEFULNESSASECONOMICINDICATORSTHEGDPDEFLATORISALAGGINGECONOMICINDICATOR,ASISTHEPCE,WHILETHECPIISCOINCIDINGANDTHEPPIISLEADINGTHEDIFFICULTIESOFMEASURINGQUALITYIMPROVEMENTS,INNOVATIONS,ORTHESUBSTITUTABILITYOFGOODSSHOULDALSOBEDISCUSSEDTHEREISAGREATDEALOFDISCUSSIONOFHOWWELLTHECPIACTUALLYMEASURESTHETRUECOSTOFLIVINGSINCEMANYCONTRACTSHAVECOSTOFLIVINGADJUSTMENTSCOLASTHATAREBASEDONTHECPI,ANOVERSTATEMENTOFINFLATIONBYTHECPICANBEVERYCOSTLYWHENDISCUSSINGMEASUREMENTSFORINFLATION,ITISIMPORTANTTOMENTIONTHEDIFFERENCEBETWEENNOMINALANDREALINTERESTRATESSOMEINSTRUCTORSMAYWANTTOMENTIONTHEFISHEREQUATION,NAMEDAFTERIRVINGFISHER,WHOANALYZEDTHELINKAGEBETWEENINFLATIONANDINTERESTRATESITSTATESTHATTHENOMINALINTERESTRATEIISTHEEXPECTEDREALRATEOFINTERESTREPLUSTHEEXPECTEDRATEOFINFLATIONE,ORIREEFROMTHISWECANCONCLUDETHATINTHELONGRUN,WHENALLADJUSTMENTSHAVEOCCURRED,THEREALINTERESTRATEISEQUALTOTHENOMINALINTERESTRATEMINUSTHERATEOFINFLATION,THATIS,RIEVENATTHISEARLYSTAGEINTHESEMESTERSOMEINSTRUCTORSMAYWANTTOATTEMPTTOGIVESTUDENTSATLEASTARUDIMENTARYUNDERSTANDINGOFHOWTHEUNEMPLOYMENTRATEISCALCULATEDORWHYTHEUNEMPLOYMENTRATEINTHEUSHASBEENLOWERTHANTHATOFMANYEUROPEANCOUNTRIESINRECENTYEARSEVENTHOUGHTHEOPPOSITEWASTRUEINTHE1960SOR1970SSIMILARLY,ABRIEFEXPLANATIONOFWHYTHEEXCHANGERATEBETWEENTHECURRENCIESOFTWOPARTICULARCOUNTRIESMAYNOTNECESSARILYGIVEMUCHINDICATIONOFWHETHERSPECIFICGOODSAREMOREORLESSEXPENSIVEINTHESETWOCOUNTRIESMAYBEAPPROPRIATEHOWEVER,SINCETHESETWOISSUESAREEXPLAINEDINMUCHMOREDETAILINLATERCHAPTERS,INSTRUCTORSPRESSEDFORTIMEMAYWANTTODISREGARDTHESEISSUESATTHISTIMEASIMPORTANTASNATIONALINCOMEACCOUNTINGISINASSESSINGTHEPERFORMANCEOFTHEECONOMY,SOMEINSTRUCTORSMAYWANTTOLEAVEMUCHOFTHEMATERIALUPTOSTUDENTSTOREADONTHEIROWN,GIVENTHESHORTNESSOFTHESEMESTERANDTHEAMOUNTOFMATERIALSTILLTOBECOVEREDHOWEVER,AFEWNATIONALINCOMEACCOUNTINGIDENTITIESSHOULDBEDERIVEDIFTHISISDONEINCONJUNCTIONWITHACIRCULARFLOWDIAGRAM,INSTRUCTORSCANSTARTOUTWITHTHEEQUATIONYCANDGRADUALLYEXTENDTHEDIAGRAMANDTHECORRESPONDINGEQUATIONSWITHADDITIONALINJECTIONSANDLEAKAGESUPTOTHEPOINTWHEREYCIGNXTHISWAYITCANBESHOWNTHATTHEFIRSTEQUATIONISEQUIVALENTTOS0,WHILETHELATTERISEQUIVALENTTOSTATRIGNXOTHERINSTRUCTORSMAYWANTTOCHOOSEONLYANALGEBRAICAPPROACH,STARTINGWITHTHEFOLLOWINGEQUATIONS1GDPDNDP2IGIND3INKEQUATIONS1AND2SHOWTHATDEPRECIATIONDISTHEDIFFERENCEBETWEENGDPANDNDPITISALSOTHEDIFFERENCEBETWEENGROSSINVESTMENTIGANDNETINVESTMENTINEQUATION3SHOWSTHATONLYNETINVESTMENTADDSTOANATIONSCAPITALSTOCKKIFWESUBTRACTINDIRECTTAXESFROMNDP,WEGETNATIONALINCOMEYWHICHHASFOURSPENDINGCATEGORIES,BRINGINGUSTOTHEMOSTFUNDAMENTALNATIONALINCOMEACCOUNTINGIDENTITY4YCIGNXSINCE5YDYTATRAND6YDCSWEGET7YCSTATREQUATION7CANBECOMBINEDWITHEQUATION4TODERIVE8IGNXSTATR,THATIS,TOTALINJECTIONSEQUALTOTALLEAKAGESITSHOULDBENOTEDHERETHATNETEXPORTSISDEFINEDASNXXQ,WHEREEXPORTSXISANINJECTIONANDIMPORTSQALEAKAGESIMILARLY,TATRCANBEVIEWEDAS“NETTAXES,”SINCETAXESTAISALEAKAGE,WHEREASGOVERNMENTTRANSFERPAYMENTSTRISANINJECTIONEQUATION8CANNOWBEMANIPULATEDINTO9SIGTRTANXOR9ASIBDNXWHERE10GTRTABDISTHEBUDGETDEFICIT,AND11NXXQREPRESENTSNETEXPORTSEXPORTSIMPORTSEQUATION9ACANTHENBEMANIPULATEDINTO9BSIBDTD,WHICHSTATESTHATTHEDIFFERENCEBETWEENPRIVATEDOMESTICSAVINGANDPRIVATEDOMESTICINVESTMENTISEQUALTOTHEDIFFERENCEBETWEENTHEBUDGETDEFICITANDTHETRADEDEFICITTHISEQUATIONIMPLIESTHATANINCREASEINTHEBUDGETDEFICITUNLESSACCOMPANIEDBYANEQUALINCREASEINPRIVATEDOMESTICSAVINGWILLLEADTOTHECROWDINGOUTOFPRIVATEDOMESTICINVESTMENTAND/ORNETEXPORTSTHEEQUATIONCANTHEREFOREBEUSEDTOEXPLAINTHEDEVELOPMENTOFTHE“TWINDEFICITS“INTHEEARLY1980SFINALLY,ITCANBEEXPLAINEDWHYTHEDECREASEINUSBUDGETDEFICITSTHATLEADTOBUDGETSURPLUSESINTHELATE1990SWASNOTACCOMPANIEDBYADECREASEINTRADEDEFICITSMANYSTUDENTSAREWORRIEDTHATTHEUSHASMOVEDFROMBEINGTHELARGESTCREDITORNATIONTOBEINGTHELARGESTDEBTORNATIONINTHEWORLDABRIEFDISCUSSIONOFWHETHERWESHOULDBECONCERNEDBYTHISFACTANDWHETHERFOREIGNOWNERSHIPOFASSETSINTHEUSACTUALLYHELPSTOMAINTAINDOMESTICJOBSCANBEUSEFULHERE,BUTAMOREINDEPTHDISCUSSIONOFTHESEISSUESSHOULDPROBABLYBELEFTFORLATERSOMEINSTRUCTORSMAYWANTTOUSEFIGURE26,WHICHSHOWSTHEFEDERALDEBTASAPERCENTAGEOFGNPFROM17902005,INDICATINGALSOPERIODSOFRECESSIONANDWAR,ASAWAYTOSOLICITSTUDENTOPINIONSOFWHATFACTORSMAYCAUSEASIGNIFICANTINCREASEINTHENATIONALDEBTANDATWHATPOINTAHUGENATIONALDEBTMAYBECOMEACONCERNTOPOLICYMAKERSCHAPTER19STRESSESTHEFACTTHATANINCREASEINTHENATIONALDEBTDOESNOTNECESSARILYIMPLYANINCREASEINTHEDEBTINCOMERATIO,THATIS,THEDEBTASAPORTIONOFGDP,BUTSOMEINSTRUCTORSMAYWANTTOMENTIONTHISHEREALREADYSINCELATERCHAPTERSUSETHECONCEPTOFTHEBUDGETSURPLUSBSWHENDISCUSSINGFISCALPOLICY,SOMEINSTRUCTORSMAYACTUALLYPREFERTOUSETHEFOLLOWINGEQUATIONRATHERTHANEQUATION1010ABSTAGTR,MULTIPLYINGEQUATION9BBY1,WECANOBTAINTHEFOLLOWINGEQUATION9CISBSNXOR9DNXSBSI,WHICHSTATESTHATIFNATIONALSAVINGISNOTSUFFICIENTTOFINANCEPRIVATEDOMESTICINVESTMENTI,THENFUNDSHAVETOBEBORROWEDFROMABROAD,CAUSINGNETEXPORTSNXTOBECOMENEGATIVENATIONALSAVINGCONSISTSOFPRIVATEDOMESTICSAVINGSANDGOVERNMENTSAVING,WHICHISPOSITIVEIFTHEGOVERNMENTRUNSABUDGETSURPLUSADISTINCTIONBETWEENGOVERNMENTPURCHASESGANDGOVERNMENTEXPENDITURESGTRSHOULDALSOBEMADE,ASMANYSTUDENTSARENOTAWARETHATTRANSFERPAYMENTSTRARETREATEDSEPARATELYFROMGOVERNMENTPURCHASESGTRANSFERPAYMENTSDONOTDIRECTLYENTERGDP,SINCENOPRODUCTIVEACTIVITYTAKESPLACEWHENSUCHPAYMENTSAREMADEADDITIONALREADINGSBOSKIN,MICHAEL,ETAL,“CONSUMERPRICES,THECONSUMERPRICEINDEX,ANDTHECOSTOFLIVING,”JOURNALOFECONOMICPERSPECTIVES,WINTER,1998BOSKIN,MICHAEL,ETAL,“GETTINGTHE21STCENTURYGDPRIGHT,”AMERICANECONOMICREVIEW,MAY,2000DEVINE,JAMES,“THECOSTOFLIVINGANDHIDDENINFLATION,”CHALLENGE,MARCH/APRIL,2001CLARK,TODD,“ACOMPARISONOFTHECPIANDTHEPCEPRICEINDEX”ECONOMICREVIEW,FRBOFKANSASCITY,THIRDQUARTER,1999THEECONOMIST,THEECONOMISTGUIDETOECONOMICINDICATORSMAKINGSENSEOFECONOMICS,WILEYANDSONS,NEWYORK,1998EISNER,ROBERT,“THETOTALINCOMESSYSTEMOFACCOUNTS,”SURVEYOFCURRENTBUSINESS,JANUARY,1985FRUMKIN,NORMAN,THEGUIDETOECONOMICINDICATORS,THIRDEDITION,MESHARPE,NEWYORK,2000HOUSTON,JOEL,“THEUNDERGROUNDECONOMYATROUBLINGISSUEFORPOLICYMAKERS,”BUSINESSREVIEW,FRBOFPHILADELPHIA,SEPTEMBER/OCTOBER,1987LEBOW,D,ANDBUDD,J,“MEASUREMENTERRORINTHECONSUMERPRICEINDEXWHEREDOWESTAND,”JOURNALOFECONOMICLITERATURE,MARCH,2003MADIGAN,KATHLEEN,“UNVEILINGTHESECRETSOFTHECPI,”BUSINESSWEEK,JULY12,1999MANDEL,MICHAEL,“WHYTHEECONOMYISALOTSTRONGERTHANYOUTHINK,”BUSINESSWEEK,FEBRUARY13,2005NORDHAUS,WILLIAM,“QUALITYCHANGEINPRICEINDEXES,”JOURNALOFECONOMICPERSPECTIVES,WINTER,1998POLLAK,ROBERT,“THECONSUMERPRICEINDEXARESEARCHAGENDAANDTHREEPROPOSALS,”JOURNALOFECONOMICPERSPECTIVES,WINTER,1998RITTER,JOSEPH,“FEEDINGTHENATIONALACCOUNTS,”REVIEW,FRBOFSTLOUIS,MARCH,2000UCHITELLE,LOUIS,“SEIZINGINTANGIBLESFROMTHEGDP,”THENEWYORKTIMES,APRIL9,2006LEARNINGOBJECTIVESSTUDENTSSHOULDBECOMEFAMILIARWITHTHEFOURMAINCOMPONENTSOFSPENDINGASWELLASTHEIRMAGNITUDERELATIVETOGDPSTUDENTSSHOULDBECOMEFAMILIARWITHTHERELATIVEIMPORTANCEOFTHEFACTORPAYMENTSLABORANDCAPITALSTUDENTSSHOULDGAINANUNDERSTANDINGOFTHEDIFFICULTIESTHATARISEINACCURATELYMEASURINGGDPANDTHERATEOFINFLATIONSTUDENTSSHOULDBECOMEFAMILIARWITHTHEBASICNATIONALINCOMEACCOUNTINGIDENTITIESPRESENTEDINTHETEXTSTUDENTSSHOULDGAINANUNDERSTANDINGOFTHERELATIONSHIPSBETWEENPRIVATEDOMESTICSAVING,PRIVATEDOMESTICINVESTMENT,THEBUDGETDEFICIT,ANDTHETRADEDEFICIT,ANDTHECOMPLEXITYOFISSUESTHATAREASSOCIATEDWITHTHEINTERRELATIONSHIPSAMONGTHESEVARIABLESSTUDENTSSHOULDBEABLETODIFFERENTIATEBETWEENTHETHREEPRICEINDEXESDISCUSSED,THATIS,THEGDPDEFLATOR,THEPCE,THECPI,ANDTHEPPISTUDENTSSHOULDBEABLETODIFFERENTIATEBETWEENREALANDNOMINALINTERESTRATESSOLUTIONSTOPROBLEMSINTHETEXTBOOKCONCEPTUALPROBLEMS1GOVERNMENTTRANSFERPAYMENTSTRDONOTARISEOUTOFANYPRODUCTIONACTIVITYANDARETHUSNOTCOUNTEDINTHEVALUEOFGDPIFTHEGOVERNMENTHIREDTHEPEOPLEWHORECEIVETRANSFERPAYMENTS,THENTHEIRWAGESWOULDBECOUNTEDASPARTOFGOVERNMENTPURCHASESG,WHICHISCOUNTEDINGDPTHEREFOREGDPWOULDRISEEVENIFTHESEWORKERSWEREPAIDTODONOTHING,ASGOVERNMENTPURCHASESAREMEASUREDONACOSTBASIS2AIFTHEFIRMBUYSACARFORANEXECUTIVESUSE,THEPURCHASECOUNTSASINVESTMENTIHOWEVER,IFTHEFIRMPAYSTHEEXECUTIVEAHIGHERSALARYANDSHETHENBUYSACAR,THEPURCHASEOFHERCARISCOUNTEDASCONSUMPTIONCINEITHERCASE,GDPWILLINCREASE2BTHESERVICESTHATAHOMEMAKERPROVIDESARENOTCOUNTEDINGDPREGARDLESSOFTHEIRVALUEHOWEVER,IFANINDIVIDUALOFFICIALLYHIRESHISORHERSPOUSETOPERFORMHOUSEHOLDDUTIESATACERTAINWAGERATE,THEWAGESEARNEDWILLBECOUNTEDINGDPANDGDPWILLINCREASE2CIFYOUBUYAGERMANCAR,CONSUMPTIONCWILLINCREASEBUTNETEXPORTSNXXQWILLDECREASEOVERALLGDPWILLINCREASEBYTHEVALUEADDEDATTHEFOREIGNCARDEALERSHIP,SINCETHEIMPORTPRICEISLIKELYTOBELESSTHANTHESALESPRICEIFYOUBUYANEWAMERICANCAR,CONSUMPTIONANDTHUSGDPWILLINCREASEBYTHEFULLVALUEOFTHECARNOTEIFTHECARYOUBUYCOMESOUTOFLASTYEARSINVENTORYATTHECARDEALERSHIP,THENTHEINCREASEINCWILLALSOBEPARTIALLYOFFSETBYADECLINEINIDUETOACHANGEININVENTORY,ANDGDPWILLONLYINCREASEBYTHEVALUEADDED3GDPISTHEMARKETVALUEOFALLFINALGOODSANDSERVICESCURRENTLYPRODUCEDWITHINTHECOUNTRYTHEUSGDPINCLUDESTHEVALUEOFTHEHONDASPRODUCEDBYAJAPANESEOWNEDASSEMBLYPLANTTHATISLOCATEDINTHEUS,BUTITDOESNOTINCLUDETHEVALUEOFNIKESHOESTHATAREPRODUCEDBYANAMERICANOWNEDSHOEFACTORYLOCATEDINMALAYSIAGNPISTHEMARKETVALUEOFALLFINALGOODSANDSERVICESCURRENTLYPRODUCEDUSINGASSETSOWNEDBYDOMESTICRESIDENTSHERETHEVALUEOFTHEHONDASPRODUCEDBYAJAPANESEOWNEDHONDAPLANTINTHEUSISNOTCOUNTEDINGNPBUTTHEVALUEOFTHENIKESHOESBYTHEAMERICANOWNEDSHOEPLANTINMALAYSIAISNEITHERISNECESSARILYABETTERMEASUREOFTHEOUTPUTOFANATIONTHEACTUALVALUESOFTHEGDPANDGNPFORTHEUSAREFAIRLYCLOSE4NDPNETDOMESTICPRODUCTISDEFINEDASGDPMINUSDEPRECIATIONDEPRECIATIONMEASURESTHEVALUEOFTHECAPITALTHATWEARSOUTDURINGTHEPRODUCTIONPROCESSANDHASTOBEREPLACEDTHEREFORENDPCOMESCLOSERTOMEASURINGTHENETAMOUNTOFGOODSPRODUCEDINTHISCOUNTRYIFTHISISWHATYOUWANTTOMEASURE,THENNDPSHOULDBEUSED5INCREASESINREALGDPDONOTNECESSARILYMEANINCREASESINPEOPLESWELFAREFOREXAMPLE,IFTHEPOPULATIONOFACOUNTRYINCREASESPROPORTIONALLYMORETHANREALGDP,THENTHEPOPULATIONOFTHECOUNTRYISONAVERAGEWORSEOFFALSOSOMEINCREASESINOUTPUTCOMEFROMEVENTSTHATREDUCEPEOPLESWELFAREFOREXAMPLE,INCREASEDPOLLUTIONMAYCAUSEMORELUNGCANCER,ANDTHETREATMENTOFTHELUNGCANCERWILLCONTRIBUTETOGDPSIMILARLY,ANINCREASEINCRIMEMAYLEADTOOVERTIMEWORKFORPOLICEOFFICERS,WHOSEINCREASEDSALARYWILLINCREASEGDPBUTTHEWELFAREOFTHEPEOPLEINTHECOUNTRYWILLNOTHAVEINCREASEDINEITHEROFTHESECASESONTHEOTHERHAND,GDPALSODOESNOTALWAYSACCURATELYMEASUREQUALITYIMPROVEMENTSINGOODSORSERVICESFASTERCOMPUTERSORIMPROVEDHEALTHCARETHATIMPROVEPEOPLESWELFARE6THECPICONSUMERPRICEINDEXANDTHEPPIPRODUCERPRICEINDEXAREBOTHMEASUREDBYLOOKINGATACERTAINMARKETBASKETTHECPISBASKETCONTAINSMOSTLYFINISHEDGOODSANDSERVICESTHATCONSUMERSTENDTOBUYREGULARLYTHEPPISBASKETCONTAINSRAWMATERIALSANDSEMIFINISHEDGOODS,THATIS,ITMEASURESCOSTSTOTHEPRODUCEROFAGOODTHECPIISACONCURRENTECONOMICINDICATOR,WHEREASTHEPPIISALEADINGECONOMICINDICATORSOIFYOUWANTTOASSESSCURRENTINFLATION,YOUNEEDTOLOOKATTHECPI,BUTIFYOUWANTTOASSESSTHEPOSSIBILITYOFFUTUREINFLATION,YOUNEEDTOLOOKATTHEPPI7THEGDPDEFLATORISAPRICEINDEXTHATCOVERSTHEAVERAGEPRICEINCREASEOFALLFINALGOODSANDSERVICESCURRENTLYPRODUCEDWITHINANECONOMYITISDEFINEDASTHERATIOOFCURRENTNOMINALGDPTOCURRENTREAL
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