单选题 IV.(CriminalLaw) Theacrimoniousdebateovercapitalpunishmenthascontinuedforcenturies.Inrecentdecades,thedebatehasheatedupintheU.S.followingtheSupremeCourt-imposedmoratoriumoncapitalpunishment.Currently,severalstatesareconsideringachangeintheirpoliciesregardingthestatusofthedeathpenalty.Nebraska‘slegislature,forexample,recentlypassedatwo-yearmoratoriumonexecutions,whichwas,however,vetoedbythestate‘sgovernor.Tenotherstateshaveatleastconsideredamoratoriumlastyear.ThegroupincludesOklahomawhoselegislaturewillsoonconsiderabillimposingatwo-yearmoratoriumonexecutionsandestablishingataskforcetoresearchtheeffectivenessofcapitalpunishment.ThelegislatureinNebraskaandIllinoishasalsocalledforsimilarresearch.InMassachusetts,however,theHouseofRepresentativesvoteddownabillsupportedbythegovernortoreinstatethedeathpenalty. Animportantissueinthisdebateiswhethercapitalpunishmentdetersmurders.Psychologistsandcriminologistswhoexaminedtheissueinitiallyreportednodeterrenteffect.EconomistsjoinedthedebatewiththepioneeringworkofEhrlich.Ehrlich‘sregressionresults,usingU.S.aggregatetime-seriesfor1933-1969andstatelevelcross-sectionaldatafor1940and1950,suggestasignificantdeterrenteffect,whichsharplycontrastswithearlierfindings.ThepolicyimportanceoftheresearchinthisareaisborneoutbytheconsiderablepublicattentionthatEhrlich‘sworkhasreceived.TheSolicitorGeneraloftheUnitedStates,forexample,introducedEhrlich‘sfindingstotheSupremeCourtinsupportofcapitalpunishment. CoincidingwiththeSupremeCourt‘sdeliberationontheissue,Ehrlich‘sfindinginspiredaninterestineconometricanalysisofdeterrence,leadingtomanystudiesthatusehisdatabutdifferentregressionspecifications--differentregressorsordifferentchoiceofendogenousvs.exogenousvariables.ThemixedfindingspromptedaseriesofsensitivityanalysesonEhrlich‘sequations,reflectingafurtheremphasisonspecification. Dataissues,ontheotherhand,havereceivedfarlessattention.Mostoftheexistingstudiesuseeithertime-seriesorcross-sectiondata.Thestudiesthatusenationaltime-seriesdataareaffectedbyanaggregationproblem.Anydeterrencefromanexecutionshouldaffectthecrimerateonlyintheexecutingstate.Aggregationdilutessuchdistincteffects.Crosssectionalstudiesarelesssensitivetothisproblem,buttheirstaticformulationprecludesanyconsiderationofthedynamicsofcrime,lawenforcement,andjudicialprocesses.Moreover,crosssectionalstudiesareaffectedbyunobservedheterogeneitywhichcannotbecontrolledforintheabsenceoftimevariation. HashemDezhbakhshandPaulH.Rubin:―DoesCapitalPunishmentHaveaDeterrentEffect?

单选题 Fromthefirstparagraph,onecanknowthatintheUS

单选题 Whichofthefollowinggroupofpeoplethoughtthatcapitalpunishmenthadnodeterrenteffect?

单选题 Accordingtothe3rdparagraph,whichofthefollowingisNOTtrue?

单选题 Inthe4thparagraph,theauthorthinksthat