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Reputation and Internet Auctions : eBay and Beyond [Snijders and Zijdeman, 2004]. Introduction. Real auction vs. Online auction The issue of trust Reputation systems Different studies, different findings. Trust. Four elements Placing trust provides trustee with resources
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Reputation and Internet Auctions: eBay and Beyond[Snijders and Zijdeman, 2004]
Introduction • Realauction vs. Online auction • The issue of trust • Reputationsystems • Different studies, different findings
Trust Fourelements • Placing trust provides trustee with resources • Trustor is betteroffplacing trust • Placing trust is voluntarily and without safeguards • Time lag betweenplacing trust and honouringit
Trust: sellercharacteristics Reputationcanimprove trust, 3 assumptions: • Winning buyeralways provides feedback aftersale • This feedback shouldbehonest • Sellerbehaviourshouldbestable over time
Trust: sellercharacteristics Reputationassumptionsnotrealisticbecause: • Harder to givenegative feedback, danger of retaliation • Possible to givepositive feedback whennegative is appropriate • Behaviour is notstable over time • As reputationincreasesincentive to behavecorrectlydecreases
Trust: buyer and product characteristics Buyer: • Experiencewith prior transactions Product: • Trustorneeds more certaintywithriskyproducts • Value of products • Usedornew • Photo • Packaging • Stilldependson trust in descriptionorseller
Contextual factors Auctioncharacteristics: • Paymentmethods • Bidding increment/reserve price • Shipmentcosts • Auction time Site characteristics: • Reputation • Fees
Remarkableresults of other studies • Sometimesreputation score negativelycorrelatedwithsellingprice • Results are very diverse
Research reproduced • Mobile phones • 4 sites: Ricardo.nl, eBay, ePier, XQL
Results Reproduction of resultsdidnotlead to sameresults: • Different variables in data • Different opperationalization of reputation score in data • Different productsunderstudy Some research didnot account forheteroscedasticity. Aterdoingso, a smallans significant effect forreputation score onsellingprice was found.
Recomendations … forselling a product: • Picture • Functiondescription • Experiencevsnoexperience • Usedvsnew
Discussion • More variables • Account for different operationalizations of reputation score • Thinkabout different productsunderstudy • Differencebetweenused and newproducts • Account fordifferencebetween sites
On-lineReputation Systems: The Effects of Feedback Comments and Reactionson Building and Rebuilding Trust in On-lineAuctions[Sonja Ulz, Uwe Matzat, Chris Snijders]
(Re)building trust • Majority of eBayusersread at least 1 page of feedback about a seller • Noise: Differencesbetweenactual and intendedoutcomesdue to unintendederrors
Trust violation • Competence-basedviolation • Moralitybasedviolation
Experiment 2 Scenarios • Broken product • Delayeddelivery 3 types of feedback • Denial • Apology • No feedback
Discussion • Otherways of building trust • Do these resultsholdfor online auctions in generalor are the resultsonlyforeBay?
Findings • Perceivedtrustworthinesshigherforlesssevereviolations. • Plainapologyleads to highertrustworthiness • The effect of feedback ontrustworthiness are mediatedbybelievability