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1、专题限时检测(十九) 阅读理解B篇保分练(二)(共4篇，限时28分钟)A(2019·南京、盐城模拟)Thatcompetitionkeepspricesdowniswellknown.Butitishardtomeasurebyjusthowmuch,becausepricesvaryforallsortsofreasons,fromdifferencesinlabourcostsandrentstotaxes.RisingtothechallengeisanewpaperinTheEconomicJournalbyGiacomoCalzolari,AndreaIchino,Francesco
2、ManaresiandVikiNellas，economistsattheEuropeanUniversityInstitute,BolognaUniversityandtheItaliancentralbank.Theylookedatpharmacies(药房)andspecificallyatcustomerswhomaybeparticularlyeasytoripoff:newparents.Usingdatafor2007to2010coveringaboutafifthofpharmaciesinItaly,theresearchersmeasuredthewayinwhichp
3、ricesofhygieneproductsforbabieschangedasthenumberofbabiesvaried.Theytookadvantageofapeculiarlawfromthe1960s,accordingtowhichregionswithatmost7,500peopleareallowedjustonepharmacy(supposedlytokeepthequalityofserviceshigh).Theycomparedpricesinplaceswithpopulationsjustbelowthisthreshold,andjustabove.The
4、productsstudiedincludedsome3,000varietiesofshampoos,bathfoams,babywipes,creamsandsoon.Manyarealsousedbyadultsonthemselves.Somepeople,forexample,prefersuncreamlabelled“forchildren”becauseofitshighlevelofprotection.Whenraisingpricesfortheseproducts,evenapharmacistwithamonopoly(垄断)mustconsidertheriskth
5、atadultuserswillswitchtoproductsthatarenotaimedatchildren.Butariseinthenumberofbabies,andhencebuyerswhoareparents,couldtip_the_scales_towardspriceincreases.Bycontrast,thepharmacistshouldalreadybechargingasmuchasparentsarewillingtopayforproductswithoutadultusers,suchasnappies.Thescholarsfoundthatphar
6、macistsraisedpriceswhenthereweremorenewparents—butonlyinregionswithasinglepharmacy,andnotfornappies.Inmonopolyareasadoublingofthenumberofbabiesfromonemonthtothenext(notunusualinasmallpopulation)coincidedwitha5%increaseinthepriceofthebasketofbabyhygieneproducts.Thestudyistimely.Italy'sgovernmenthasst
7、artedtoloosensomeofthemanyrestrictionsthatstopcompetitioninthepharmacysector(thoughnotyettheonethattheresearchersreliedon).Butsuchregulationsareplentifulinmanyotherlinesofbusiness,andnotjustinItaly.Th
