Withthebuyer'smarketstrengthening,retailershavebeguntoleadinproductdevelopmentbyintroducingtheirownprivatelabelproducts.Thesuccessofsuchanewproductlaunchreliesontransmissionofdemandinformationalongasupplychain,yetthisnewphenomenonhasbeenlittleresearched.Thispaperattemptstoaddresssuchanissuebymodelingverticalinformationtransmissioninasupplychainconsistingofaretailerandamanufacturer.Theretailerwouldliketointroduceanewprivatelabelproductandknowsthedemandoftheproducttobeeitherhighorlow,whilethemanufactureronlyknowsthepriordistributionofthedemandtype.Thisstudyattemptstofindwhetherawholesale-pricecontractoratwo-parttariffcontractcanfacilitatethemanufacturertoidentifythedemandtype.Theresultsshowthatthetwo-parttariffcontractisalwayseffectiveinrealizinginformationtransmissionaslongastheretailer'sreserveprofitremainswithinareasonablerange.
