TheDemandforDairyProductsinTurkeyTheImpactofHouseholdCompositiononConsumptiondoc.docx
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TheDemandforDairyProductsinTurkeyTheImpactofHouseholdCompositiononConsumptiondoc
TheDemandofDairyProductsinTurkey:
TheImpactofHouseholdCompositiononConsumption
A.AliKoç
ResearchConsultant
AgriculturalEconomicsResearchInstituteAnkara,e-mail:
aakoc@
SibelTan
AgriculturalEconomist,
AgriculturalEconomicsResearchInstituteAnkara,e-mail:
sibeltan@aeri.org.tr
Türkiye’deSütÜrünleriTalebi:
HanehalkıNüfusYapısınınTüketimÜzerineEtkisi
Özet
Buçalışmadafarklısütürünleriiçinfarklımodeltanımlanarak(Working-Leser,AIDSveÇift-Logaritmikfonksiyon)Engelfonksiyonutahminedilmiştir.Çalışmadayeralansüt,yoğurt,peynirvetereyağiçinharcamaesnekliklerihespalanmıştır.Peynirvesütiçinfiyat-talepesneklikleridetahminedilmiştir.Çalışmailehanehalkınüfusyapısınınpeynirvesüttüketimüzerineetkisidebelirlenmiştir.Sonuçlarhaneyeyenibirbireydahilolduğundapeynirvesüttüketimharcamasınınazalacağınıveyanegatifetkileneceğinigöstermektedir.Bunegatifetkibireyinyaşıiledoğruorantılıolarakartmaktadır.
Abstract
ThisstudyestimatesdifferentEngelCurves(intheformsof“Working-Leser”,AIDSwithunitvalue,andDouble-Log)fordifferentdairyproductsinTurkey.Studyprovidesexpenditureelasticityforfourdairyproducts(milk,yogurt,cheeseandbutter).Own-priceelasticityisalsocalculatedforcheeseandbutter.Householdcompositioneffectsoncheeseandmilkconsumptionaredeterminedbythestudy.Resultsindicatethatadditionofanextrapersontoahouseholdhasnegativeimpactonpercapitacheeseandmilkexpenditure.Thisnegativeimpactgetsbiggerwithage.
KeyWords:
RepublicofTurkey,DairyProductDemand,HouseholdCompositionEffects,Working-Leser,andAIDSwithUnitValue
1.Introduction
2.
CommonlyusedfooddemandprojectionmethodisthesyntheticDouble-logspecificationthatemploysincomeelasticityandpopulationgrowthforfooddemandprojection,particularlyindevelopingcountries.Thismethodmaygeneratebiasedfooddemandprojectionsandpolicyresults,ifpopulationcompositionandotherdemandshifters(relativecommodityprice,urbanization,education,etc.)arealsochangedwithrapidly.ThisisthecurrenttrendinTurkeyasinmanymiddleincomedevelopingcountries.Ontheotherhand,intelligentpolicydesignforindirecttaxationandsubsidiesrequiresknowledgeofpriceandincomeelasticitiesfortaxablecommodities(Deaton,1988).Suchknowledgewouldnormallybeobtainedbytheanalysisoftime-seriesdataforaggregatedemand,prices,andincomes.
Unfortunately,inTurkey,aswellasinmanydevelopingcountries,time-seriesfooddisappearancedataisnotreadilyavailabletoeconomistsoranalysts;however,manydevelopingcountriesregularlycollecthigh-qualityhouseholdsurveydataonexpendituresandquantitiespurchasedforawiderangeofcommodities.Inprinciple,thesehouseholdsurveyscontaininformationaboutthespatialdistributionofpricessothat,ifthisinformationcouldberecoveredintheusableform,thereisgreatpotentialforestimatingthedemandresponsesrequiredforpolicymaking(Deaton,1988).Ifunitvalues,obtainedbydividingexpenditurebyquantity,areadjustedwithqualitydifferences,thenthisdatapermitstheestimationoffooddemandatdisaggregatedlevels,whichisofinteresttopublicpolicymakers,agribusinessindustries,andproducerorganizations.
InTurkey,theStateInstituteofStatistics(SIS)conductedlarge-scalehouseholdconsumptionexpendituresurveysin1979,1987and1994.Unfortunately,SISdidnotmakethesurveyresultsavailabletousersatindividualhouseholdlevel.Thepublishedformoftheconsumptionexpendituresurveydataisaggregatedatincomepercentiles.
Thisstudyestimatesahouseholddairyproductdemandatadisaggregatedlevelwithhouseholdcompositionvariablesandqualityadjustedunitvaluesusingdatafromthe“1994HouseholdConsumptionExpenditureSurveyResultsforSelectedProvinceCenters”(SIS,1997).
2.Model
AformoftheEngelcurve,whichhasperformedwellintheempiricalanalysisofcross-sectiondata,expressesbudgetshareasafunctionofthelogarithmofincome(YoungandHamdok,1994):
(1)
whereWiisthebudgetshareoftheithgoodinfullincome,andyisthehousehold’sfullincome;iandiareparameterstobeestimated.Thisform,oftenknownasthe“Working-Leser”curve,isconsistentwiththeAlmostIdealDemandSystemwhenpricesareconstant(ChesherandRees,1987).
Deaton(1997,p.231);YoungandHomdok(1994)introducedhouseholdsizeandhouseholdcompositionbyre-defininghouseholdincomeinpercapitatermsandbyre-specifyingtheintercepttermtoallowfortheinfluenceofhouseholdcompositionasfollow:
(2)
wherendenoteshouseholdsize,andthreehouseholdmembertypearedistinguished(k=1,2,and3),n1thenumberofchildrenlessthan12yearsold,n2thenumberofteenageragedbetween12and17yearsandn3thenumberofadultaged18andover;ikiandidenoteparameterstobeestimated.Inequation
(2),thehouseholdcompositionvariablesactasexplicitdemandshifters.Householdsize(n)entersasaseparateexplanatoryvariable(inlogform),aswellasinpercapitaincometerm.Thisistoensurethatthewayinwhichincomeaffectsbehaviourisunrestricted(YoungandHomdok,1994).Equation
(2)mayfurtherbeimprovedbymeansofintroducingpriceterm(hereisunitvaluethatisobtainedbydividingexpenditurebyquantitypurchasedofthegoods):
(3)
whereP*istheunitvalueoftheithgoodthatneedstobeadjustedifaggregatequantityofthegoodsiscomposedfromheterogeneousproduct.
Oneproblemassociatedwiththemodeldescribedbyequation(3)isthattheunitvalue,obtainedbydividingexpenditurebythequantitypurchased,isnotadirectsubstitutefortheactualmarketprice.Unitvaluesnotonlyreflectspatialvariationinpricesduetothetransportcostdifferentials,theyalsoreflectconsumerqualitychoicesintheirpurchasesanderrorsinmeasuringexpendituresandquantities(Deaton,1988).Ifunitvaluesareuseddirectlyindemandestimation,thepriceelasticitiesarenotstandardelasticitiesofdemand.Theyalsoreflectqualityelasticitiesofdemand(Theil,1952;Houthakker,1952;Cramer,1973;CoxandWohlgenant,1986;Deaton,1987,1988and1990;Nelson,1991;Parketal.,1996;andDongetal.,1998).
Thecausesofcross-sectionalpricevariationmustbeidentifiedinordertointerpretcorrectlytheeffectsofpricesintheanalysisofhouseholdbudgetdata(PraisandHouthakker,1955,p.110).Polinsky(1977)pointedoutthatfailuretospecifycross-sectionalpriceeffectsadequatelycouldresultinbiasedandmisleadingdemandelasticities.Thus,traditionalEngelanalysismaybeinappropriateifthepricesfacedbyindividualconsumersarenotconstant.AccordingtoPraisandHouthakker(1955),pricevariationsacrossregionsmaybeduetopricediscrimination,servicesbundledwiththecommodity,seasonaleffects,andqualitydifferencescausedbytheheterogeneouscommodityaggregate.
Theopportunitycostsofconsumers'time,themarginalcost/benefitofinformationsearch,retailingstrategies,andbrandloyaltymayalsocausecross-sectionalpricedifferences.Amongtheabovefactors,qualitydifferencescausedbyheterogeneouscommodityaggregatesmaybemoreproblematicalintheestimationofdemandfunctions(CoxandWohlgenant,1986).Qualityeffectsincross-sectionalpricevariationresultmainlyfromcommodityaggregation(Houthakker,1952).Thepotentialdistortionfromnotadjustingcross-sectionalpricesforqualityeffectswillincreasewithheterogeneityofthecommodityaggregate(Cramer,1973).
Thesimplesumofphysicalquantitiesusedasthedemandinthequalityliteratureisatheoreticallyarbitrarymethodofaggregationandispotentiallyamisleadingmeasureofdemandwhengoodsareheterogeneous(Nelson,1991).AccordingtoNelson,theimportanceofproperlyadjustingforqualityvariationdependsontheimportanceofqualityeffectsinthedataunderexamination.
Thisstudyadjuststheunitvaluesintermsofincomeandhouseholdsize.Theunitvaluesoftheaggregatedcommodityareestimatedusingthefollowingequation(CoxandWohlgenant,1986;Parketal.,1996).
(4)
where
isunitvalueoftheithaggregatedcommodity,yishouseholdfullincome,andnisthehouseholdsize.Itiscommonlyassumedthattheintercepttermofthehedonicpricefunctionreflectsthequantityprice.Ifweassumetheaveragesamplepriceistheintercepttermofthehedonicpricefunction,thentheadjustedunitvaluecanbeobtainedfromequation(4).
(5)
Inequation(5)
istheaveragesampleunitvalueandisresidualfromequation(4).
IncomeandMarshallianpriceelasticitiesfromtheestimatesofequation(3)arecomputedusingfollowingformulas(GreenandAlston,1991).
Expenditure
(6)
Price
(7)
Asthewayinwhichchangesinfamilycompositionaffectdemandisquitecomplex(theadditionofafamilymemberoftypejincreasesnaswellasnj),theparametersinequation
(2)aredifficulttointerpretdirectly.Following(Chesher,1991)foreachcommoditygroup,theimpactonhouseholdexpenditureoftheadditionofahouseholdmemberoftypertothehousehold,“ceterisparibus”,maybecalculatedasfollows(YoungandHamdok,1994).
(8)
where
denotesthechangeinthebudgetshareofgoodi(orequivalently,thechangeinexpenditureiasaproportionofhouseholdincome).Itmeasuresthe“totaleffect”ofachangeofhouseholdcomposition,i.e.thecombinedimpactofthe“specificeffects”and“incomeeffect”ref
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