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2-1 Electronic Commerce (WS-02/03) 2. EC from a Business Perspective 2.1 A Taxonomy of EC Business Models [Rappa02a] o Advertising Model o Affiliate Model o Broker / Brokerage Model o Community Model o Infomediary Model o Manufacturer Model o Merchant Model o Subscription Model o Utility Model 2.2 Trends & Directions

2. EC from a Business Perspectivesem4.yolasite.com/resources/ecomm/ECommerce02.pdf · 2015. 3. 25. · Brokerage Model: Marketplace Exchange Model especially common in B2B markets

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  • 2-1Electronic Commerce (WS-02/03)

    2. EC from a Business Perspective

    2.1 A Taxonomy of EC Business Models [Rappa02a]

    o Advertising Model

    o Affiliate Model

    o Broker / Brokerage Model

    o Community Model

    o Infomediary Model

    o Manufacturer Model

    o Merchant Model

    o Subscription Model

    o Utility Model

    2.2 Trends & Directions

  • 2-2Electronic Commerce (WS-02/03)

    ECommerce Reference Model

    Base Technologies

    (Internet-, Communication-, Security-, DB-, Software-Technology)

    Forms of

    Payment

    Security,

    Trust

    Transact.

    Control

    Agent

    Technlgy

    Mediation,

    NegotiationEDI

    Political

    and

    Legal

    Aspects

    of

    EC

    Business Process Reengineering (BPR) Tools

    Electronic

    Trading Systems

    Virtual

    Organizations

    Kinds of

    Cooperation

    Applications for horizontal and vertical sectors

    Technical

    issues

    Organi-

    zational

    issues

    [MeTuLa99]

  • 2-3Electronic Commerce (WS-02/03)

    Further Reading

    Most of the following is taken as is from the ecommerce lecture of Michael Rappa[Rappa02a].

    Michael Rappa, Business Models on the Web:http://digitalenterprise.org/models/models.html

  • 2-4Electronic Commerce (WS-02/03)

    Business Models

    Current business models are:

    o Advertising Model

    o Affiliate Model

    o Broker / Brokerage Model

    o Community Model

    o Infomediary Model

    o Manufacturer Model

    o Merchant Model

    o Subscription Model

    o Utility Model

    Some of these business models are still successful, whereas other have not proven tobe accepted by Internet customers.

  • 2-5Electronic Commerce (WS-02/03)

    Business Models: Brokerage ModelBrokers are market-makers: they bring buyers and sellers together and facilitatetransactions. Those can be business-to-business (B2B), business-to-consumer (B2C),or consumer-to-consumer (C2C) markets. A broker makes its money by charging a feefor each transaction it enables. Brokerage models can take a number of forms.

    Specializations:

    o Auction Broker, Reverse Auction (Demand Collection System)

    o Marketplace Exchange

    o Buyer Aggregator

    o Search Agent

    o Business Trading Community or Vertical Web Community

    o Virtual Mall

    o Buy/Sell Fulfillment

    o Distributor

    o Bounty Broker

    o Transaction Broker

  • 2-6Electronic Commerce (WS-02/03)

    Brokerage Model: Auction Broker

    A site that conducts auctions for sellers(individuals or merchants). Brokercharges seller a fee, which is typicallyscaled with the value of the transaction.Seller takes highest bid(s) from buyersabove a minimum. Auctions can vary interms of the offering and bidding rules.

    Examples: eBay (www.ebay.com),ricardo.de (www.ricardo.de).

    Auction Catalog: AuctionNet(www.auctionnet.com).

    www.ebay.com

  • 2-7Electronic Commerce (WS-02/03)

    Brokerage Model: Reverse Auction

    The "name-your-price" business model,also called "demand collection,"pioneered and patented by Priceline(www.priceline.com).

    Prospective buyer makes a final (usuallybinding) bid for a specified good orservice, and the broker seeks fulfillment.The broker's fee is the spread betweenthe bid and fulfillment price and perhapsa processing charge.

    Examples:

    PriceLine (www.priceline.com),Respond (www.respond.com).

    www.priceline.com

  • 2-8Electronic Commerce (WS-02/03)

    Brokerage Model: Buyer Aggregator

    Model pioneered by Accompany(www.accompany.com), which describesbuyer aggregation as the process ofbringing together individual purchasersfrom across the Internet to transact as agroup so they can receive the samevalues traditionally afforded toorganizations who purchase in volume.Sellers pay a small percentage of eachsale on a per-transaction basis.

    Volumebuy (www.volumebuy.com).

    www.volumebuy.com

  • 2-9Electronic Commerce (WS-02/03)

    Brokerage Model: Marketplace Exchange

    Model especially common in B2Bmarkets for basic materials and industrialintermediates.

    In the exchange model, the brokertypically charges the seller a transactionfee based on the value of the sale. Thepricing mechanism can be a simpleoffer/buy, offer/negotiated buy, or anauction offer/bid approach.

    Example:

    Orbitz(www.orbitz.com)

    ChemConnect's World ChemicalExchange (www.chemconnect.com).

    www.chemconnect.com

  • 2-10Electronic Commerce (WS-02/03)

    Brokerage Model: Search Agent

    An agent (i.e., an intelligent softwareagent or "robot") is used to search-out thebest price for a good or service specifiedby the buyer, or to locate hard to findinformation.

    Examples:DealTime (www.dealtime.com),MySimon (www.mysimon.com),RoboShopper (www.roboshopper.com),ShopFind (www.shopfind.com).

    An employment agency can act as asearch agent broker, finding work for job-seekers or finding people to fill openpositions listed by an employer.

    Example:JobPilot, (www.jobpilot.com).

    www.jobpilot.com

  • 2-11Electronic Commerce (WS-02/03)

    Brokerage Model: Business Trading Community orVertical Web Community

    A concept pioneered by VerticalNet(www.verticalnet.com). It is a site that actsas an "essential, comprehensive source ofinformation and dialogue for a particularvertical market.“ (B2B)

    Such communities contain productinformation in buyers' guides, supplier andproduct directories, daily industry newsand articles, job listings and classifieds. Inaddition, VerticalNet's sites enable B2Bexchanges of information, supplementingexisting trade shows and trade associationactivities.

    Further example:Buzzsaw (construction industry B2Bvertical community) (www.buzzsaw.com). www.verticalnet.com

  • 2-12Electronic Commerce (WS-02/03)

    Brokerage Model: Virtual Mall

    A site that hosts many online merchants.The Mall typically charges setup, monthlylisting, and/or per transaction fees

    The virtual mall model may be mosteffectively realized when combined with ageneralized portal. Also, moresophisticated malls will provide automatedtransaction services and relationshipmarketing opportunities.

    Examples:

    Yahoo! Shopping (shopping.yahoo.com),ChoiceMall (www.choicemall.com),Women.com's Shopping Network(www.women.com).

    www.choicemall.com

  • 2-13Electronic Commerce (WS-02/03)

    Brokerage Model: Buy/Sell Fulfillment

    This can be an online financial brokerage,like eTrade (www.etrade.com), wherecustomers place buy and sell orders fortransacting financial instruments.

    Also, travel agents fit into this category. Inthis the broker charges the buyer and/orseller a transaction fee.

    Some models work on volume and lowoverhead to deliver the best negotiatedprices.

    Example: CarsDirect(www.carsdirect.com).

    www.etrade.com

  • 2-14Electronic Commerce (WS-02/03)

    Brokerage Model: DistributorA catalog-type operation that connects alarge number of product manufacturers withvolume and retail buyers. B2B models areincreasingly common. Broker facilitatesbusiness transactions between franchiseddistributors and their trading partners. Forbuyers, it enables faster time to market andtime to volume as well as reducing the costof procurement. By providing the buyer witha means of retrieving quotes from preferreddistributors - showing buyer-specific prices,lead-time, and recommended substitutions -transaction are more efficient. Fordistributors, it decreases the cost of salesby performing quoting, order processing,tracking order status, and changes morequickly and with less labor.

    Example: ConvergeTrade(www.converge.com/converge/html/ offerings/3_tradehome.html).

    www.convergeTrade.com

  • 2-15Electronic Commerce (WS-02/03)

    Brokerage Model: Bounty BrokerThe offer of a reward (usually a significantmonetary sum) for finding a person, thing,idea, or other desired, but hard to find item.The broker may list items for a flat fee and apercent of the reward, if the item issuccessfully found.

    Example: BountyQuest(www.bountyquest.com), which lists rewardoffers for uncovering prior art related topatents (i.e. it lists rewards for people whofind patents that illegally claim existing,state-of-the-art procedures, technology aspart of the patent).

    (prior art = [patent right term for] state-of-the art, current).

    www.bountyquest.com

    Brokerage Model: Bounty Broker

  • 2-16Electronic Commerce (WS-02/03)

    Brokerage Model: Transaction Broker

    Provides a third-party paymentmechanism for buyers and sellers to settlea transaction.

    Examples:

    Paypal (www.paypal.com), Escrow(www.escrow.com).

    www.paypal.com

  • 2-17Electronic Commerce (WS-02/03)

    Auctions (1)

    Overview of auctions formats [ecommerce.ncsu.edu02, LR99]:

    o Classic English

    o Classic Dutch

    o Sealed Bid (First-bid and Second-bid)

    o Reverse Auction

    o Double Auction

    o Multi-Item Auction

    Definition An auction is a market institution with an explicit set of rules fordetermining resource allocation and prices on the basis of bids from themarket participants.

  • 2-18Electronic Commerce (WS-02/03)

    Auctions (2)

    Classic Englisho An auctioneer stands up in front of the room

    • Outcry: bidders call out prices

    • Silent: auctioneer calls prices and bidders signal silently

    o Highest bidder gets the object

    Comparison of traditional auction / Internet auction:

    Traditional:

    • Bidders present in the same room, the auctioneer closes the auction using the traditional“going… going… gone!” procedure.

    Internet:

    • Geographically diverse bidders generally placing their bids over a period of days or weeks.Sellers appear to prefer a closing time and date set in advance.

    • “Sniping”: practice of waiting until the last minute before the auction ends, and trying tosubmit a bid which just barely beats the high bid and gives the rival bidder no time torespond.

  • 2-19Electronic Commerce (WS-02/03)

    Auctions (3)

    Classic Dutch

    o Price clock starts at too high of a price

    o Price descends in real time

    o First bidder to signal gets the goods at the price on the clock

    Sealed Bid Auction

    o Everyone puts their bid in an envelope and submits it to the auctioneer

    o At a designated time, the auctioneer opens the envelopes and determines thehighest bidder

    o Two strategies:

    • First-price sealed bid: Highest bidder pays his bid

    • Second-price sealed bid (also called Vickrey auction): Highest bidder pays oneincrement over the second-highest bid received.

  • 2-20Electronic Commerce (WS-02/03)

    Auctions (4)

    Reverse Auction

    o Single buyer

    o Lowest seller gets to sell the object

    o Used for procurement

    Double Auction

    o “Trading floors” auction

    o One virtual trading floor for each type of goods

    o Many buyers and sellers on one trading floor

    o Updates of offers by sellers as well as bids by buyers. They “meet in the middle”:Sellers may lower ask prices, buyers may place higher bids.

  • 2-21Electronic Commerce (WS-02/03)

    Auctions (5)

    Multi-item Auction

    o Additional to existing auctions

    o Single seller

    o N units for sale

    o N highest bidders get objects and pay

  • 2-22Electronic Commerce (WS-02/03)

    German UMTS Auction

    Auction where 3rd generation mobile communication frequency blocks were sold.

    Rules of the first auction:

    o In the first round, participants may bid secretly and synchronously for at most 3blocks.

    o In the following rounds, every participant may bid for at most as many blocks as hehas bid in the first round.

    o Every round takes 40 min.

    o For every block, every valid bid must surpass the last round‘s highest bid by aminimum increment, chosen by the auctioneer (10% of last round‘s highest bid, atthe end 5%).

    o The auction ends when no valid bid is given for any block.

    o After the end of the first auction, only telcos which purchased successfully couldpurchase further blocks in a second auction.

    NOTE: These rules were developed using game theory, ensuring the auction wouldraise much money (approx. 50 billion €). [RegTP00]

  • 2-23Electronic Commerce (WS-02/03)

    Business Models: Community Model

    The viability of the community model is based on user loyalty (as opposed to high trafficvolume). Users have a high investment in both time and emotion in the site. In somecases, users are regular contributors of content and/or money. Having users who visitcontinually offers advertising, infomediary or specialized portal opportunities. Thecommunity model may also run on a subscription fee for premium services.

    Specializations:

    o Knowledge Networks / Expert Sites

    o Voluntary Contributor Model

  • 2-24Electronic Commerce (WS-02/03)

    Community Model: Knowledge Networks / Expert Sites

    Provide a source of information based onprofessional expertise or the experience ofother users. Sites are typically run like aforum where persons seeking informationcan pose questions and receive answersfrom (presumably) someone know-ledgeable about the subject. The expertsmay be employed staff, a regular cadre ofvolunteers, or in some cases, simplyanyone on the web who wishes torespond.

    Examples:

    ExpertCentral (www.expertcentral.com),AskMe (www.askme.com), NY TimesAbuzz (www.abuzz.com).

    Quite some companies have turned awayfrom this business model (guru, exp).

    www.expertcentral.com

  • 2-25Electronic Commerce (WS-02/03)

    Community Model: Voluntary Contributor Model

    Sometimes referred to as the "NPRmodel," -- the listener contributor methodused by National Public Radio in not-for-profit radio broadcasting. The model ispredicated on the creation of acommunity of users who support the sitethrough voluntary donations. Not-for-profit organizations may also seekfunding from charitable foundations tosupport the organization's mission.

    Examples:

    National Public Radio (www.npr.org),The Classical Station (www.WCPE.org).

    www.npr.org

  • 2-26Electronic Commerce (WS-02/03)

    Business Models: Infomediary ModelData about consumers and their buying habits are extremely valuable. Especially whenthat information is carefully analyzed and used to target marketing campaigns. Somefirms are able to function as infomediaries by collecting and selling information on buyerhabits to other businesses. An infomediary may offer users free Internet access inexchange for detailed information about their surfing and purchasing habits. This is morelikely to succeed than the pure advertising model.

    The infomediary model can also work in the other direction: providing consumers withuseful information about the web sites in a market segment that compete for their dollar.One such example is Gomez.

    Specializations:

    o Attention / Incentive Marketing

    o Recommender System

    o Metamediary

    o Audience Measurement System

    o Advertising Networks

  • 2-27Electronic Commerce (WS-02/03)

    Infomediary Modell: Attention / Incentive Marketing

    The "pay for attention" model - paysvisitors for viewing content and completingforms, or sweepstakes, or frequent flyer-type point schemes. The attentionmarketing approach has the most appealto companies with very complex productmessages, which might otherwise find ithard to sustain customer interest.

    The concept was pioneered by CyberGold(www.cybergold.com [ceased operations]),with its "earn and spend community" thatbrings together advertisers interested inincentives-based marketing withconsumers looking to save. To facilitatetransactions, the company developed andpatented a micropayment system.

    A current loyalty-based relationshipmarketing approach is CoolSavings(www.coolsavings.com).

    www.coolsavings.com

  • 2-28Electronic Commerce (WS-02/03)

    Infomediary Model: Recommender SystemA Recommender System is a site thatallows users to exchange information witheach other about the quality of productsand services -- or the sellers with whomthey have had a purchase experience(good or bad). Example: ePinions(www.epinions.com).

    ClickTheButton (www.clickthebutton.com,currently down) takes the concept a stepfurther by integrating the recommendersystem into the web browser. Suchagents monitor a user's habits, therebyincreasing the relevance of itsrecommendations to the users needs --and the value of the data to the collector.Recommender systems can takeadvantage of the affiliate model offeredby merchants to augment revenue fromthe sale of consumer information.

    www.epinions.com

  • 2-29Electronic Commerce (WS-02/03)

    Infomediary Model: Metamediary

    It is a virtual mall, but one that willprocess the transaction, track orders, andprovide billing and collection services.The metamediary protects consumers byassuring satisfaction with merchants. Themetamediary charges a setup fee and afee per transaction.

    In general, it is a business that bringsbuyers and online merchants togetherand provides transaction services suchas financial settlement and qualityassurance.

    Examples: Amazon's zShops(www.amazon.com), Edmunds(www.edmunds.com).

    www.edmunds.com

  • 2-30Electronic Commerce (WS-02/03)

    Infomediary Model: Audience Measurement Services

    Online audience market researchagencies.

    Examples: Nielsen//Netratings(www.netratings.com).

    www.netratings.com

  • 2-31Electronic Commerce (WS-02/03)

    Infomediary Model: Advertisement Networks

    Service that feeds banner ads to anetwork of sites, thereby enablingadvertisers to deploy large marketingcampaigns. By using cookies, the AdNetwork operator collects data on webusers that can be used to analyzemarketing effectiveness.

    Example: DoubleClick(www.doubleclick.com).

    www.doubleclick.com

  • 2-32Electronic Commerce (WS-02/03)

    Business Models: Manufacturer ModelThis model is predicated on the power ofthe web to allow manufacturers to reachbuyers directly and thereby compress thedistribution channel (i.e., eliminatewholesalers and retailers). Themanufacturer model can be based onefficiency (cost-savings that may or maynot be passed on to consumers),improved customer service, and a betterunderstanding of customer preferences.Perishable products that benefit from fastdistribution, like fresh flowers (example:Flowerbud, www.flowerbud.com), mayprove advantageous by eliminatingmiddlemen. The model has the potentialfor channel conflict with a manufacturer'sestablished supply chain. Examples: Intel(www.intel.com), Apple (www.apple.com).

    Specialization: Brand Integrated Contentwww.flowerbud.com

  • 2-33Electronic Commerce (WS-02/03)

    Traditionally, manufacturers rely onadvertising to build customer awareness.Commercials via broadcasters like radio,television and mass market publishers(newspapers and magazines), or throughproduct placement in TV and motionpictures, has been a mainstay of modernbusiness. The Web enables amanufacturer to integrate their brand moreintimately with the content.

    The innovator in this respect is the luxuryautomobile maker, BMW (BayrischeMotorenwerke AG). The web sitewww.bwmfilms.com is a creative blend ofadvertising with entertainment that pavesthe way for a new approach that might becalled "advertainment" - taking the idea ofproduct placement advertising to theextreme.

    www.bmwfilms.com

    Manufacturer Model: Brand Integrated Content

  • 2-34Electronic Commerce (WS-02/03)

    Business Models: Merchant Model

    Implements classic wholesalers and retailers of goods and services (increasingly oftenreferred to as "e-tailers"). Sales may be made based on list prices or through auction. Insome cases, the goods and services may be unique to the web and not have atraditional "brick-and-mortar" storefront.

    Specializations:

    o Bit Vendor

    o Catalog Merchant

    o Surf-and-Turf

    o Virtual Merchant

  • 2-35Electronic Commerce (WS-02/03)

    Merchant Model: Bit Vendor

    A merchant that deals strictly in digitalproducts and services and, in its purestform, conducts both sales and distributionover the web.

    Examples:

    Software companies: Objectspace(www.objectspace.com),TogetherSoft(www.togethersoft.com).

    Multimedia content provider: Eyewire(www.eyewire.com).

    www.togethersoft.com

  • 2-36Electronic Commerce (WS-02/03)

    Merchant Model: Catalog Merchant

    The migration of mail-order to a web-based order business.

    Example:

    Chef's Catalog (www.chefscatalog.com),OTTO (www.otto.de), Lands‘ End(www.landsend.com).

    www.chefscatalog.com

  • 2-37Electronic Commerce (WS-02/03)

    Merchant Model: Surf-and-Turf

    Traditional brick-and-mortar establishmentwith web storefront (a combination ofphysical and web-enabled store).

    The model has the potential for channelconflict. Physical stores can prove to bean asset if cleverly integrated into weboperations. Also known as "bricks-and-clicks".

    Examples:

    www.lehmanns.de

    www.lehmanns.de

  • 2-38Electronic Commerce (WS-02/03)

    Merchant Model: Virtual Merchant

    A business that operates only over the weband offers either traditional or web-specificgoods or services (a.k.a., pure-play e-tailers). The method of selling may be listprice or auction. An example of a servicemerchant is Facetime (www.facetime.com),which calls itself an "application serviceprovider". It offers live customer support fore-commerce web sites.

    More examples of virtual merchant:

    Amazon (www.amazon.com).

    www.facetime.com

  • 2-39Electronic Commerce (WS-02/03)

    Business Models: Subscription Model

    Users pay for access to the site.

    High value-added content is essential(example: Consumer Reports(www.consumerreports.org)).

    Generic news content, viable on thenewsstand, has proven less successful asa subscription model on the web.

    Examples: Slate (www.slate.com), Salon:(www.salon.com).

    A 1999 survey by Jupiter Communicationsfound that 46 percent of Internet userswould not pay to view content on the web.Some businesses have combined freecontent (to drive volume and ad revenue)with premium content or services forsubscribers only.

    www.consumerreports.com

  • 2-40Electronic Commerce (WS-02/03)

    Business Models: Subscription Model

    Users are charged a periodic -- daily, monthly or annual -- fee to subscribe to aservice. It is not uncommon for sites to combine free content with "premium" (i.e.,subscriber- or member-only) content. Subscription fees are incurred irrespective ofactual usage rates. Subscription and advertising models are frequently combined.

    Specializations:

    o Content Services

    o Person-to-Person Networking Services

    o Trust Services

    o Internet Service Provider

  • 2-41Electronic Commerce (WS-02/03)

    Subscription Model: Content Services

    Beyond newspapers and magazines, theWeb has encouraged the use of thesubscriber model for music and video, aswell.

    Examples:

    Listen (www.listen.com),Netflix (www.netflix.com),the new Napster will be like this(www.napster.com).

    www.listen.com

  • 2-42Electronic Commerce (WS-02/03)

    Subscription Model: Person-to-Person Networking Services

    Person-to-Person Networking Services areconduits for the distribution of user-submitted information, such as individualssearching for former school mates.

    Example: Classmates(www.classmates.com).

    www.classmates.com

  • 2-43Electronic Commerce (WS-02/03)

    Subscription Model: Trust Services

    An independent third party that engenderstrust between unfamiliar parties enteringinto a transaction. The need of trustincreases with the value and complexity ofthe product or service that is sold. Trustservices typically come in the form ofmembership associations that abide by anexplicit code of conduct, and in whichmembers pay a subcription fee.

    Example: Truste (www.truste.com).

    More on security and trust in chapter 5.

    www.truste.com

  • 2-44Electronic Commerce (WS-02/03)

    Subscription Model: Internet Service Provider

    Offer Internet connectivity andrelated services on a monthlysubscription.

    Example: AOL (www.aol.com).

    www.aol.com

  • 2-45Electronic Commerce (WS-02/03)

    Business Models: Utility Model

    The utility model is a metered usage or pay-as-you-go approach.

    Unlike subscriber services, metered services are based on actual usage rates.Traditionally, metering has been used for essential services (e.g., electricity water, long-distance telephone services). Internet service providers (ISPs) may operate as utilities,charging customers for connection minutes (in Germany: Internet Call-by-Call, e.g.Freenet), as opposed to the subscriber model (e.g., Flat Rate)

    Its success depends on the ability to charge by the byte, including micropayments (thatis, those too small to pay by credit card due to processing fees).

    Utility Model:

    o Metered Subscriptions

  • 2-46Electronic Commerce (WS-02/03)

    Utility Model: Metered Subscription

    Metered Subscriptions: Subscriberspurchase access to content in meteredportions (e.g., numbers of pagesviewed).

    Example: slashdot (slashdot.org).

    www.slashdot.org

  • 2-47Electronic Commerce (WS-02/03)

    2. EC from a Business Perspective

    2.1 A Taxonomy of EC Business Models

    2.2 Trends & Directions

    General Trends

    B2C and B2B business model trends

  • 2-48Electronic Commerce (WS-02/03)

    Trends and Directions (1)

    General trends:

    o No venture capital anymore, plunging and volatile stock markets => Few start-ups;rather mergers and acquisition

    o Instability:

    • Technology (e.g., EJB vs. .NET component architecture, interoperability ofdifferent software systems is still problematic)

    • Staff (lay-off, qualification of staff, loyality in times of lay-off)

    • Funding

    o Merging of Content, Commerce and Community

  • 2-49Electronic Commerce (WS-02/03)

    Trends and Directions (2)Business model trends:

    B2C

    o Shops: Saturation

    o Advertising and community models: Do not create revenues anymore

    o Virtual merchants: Few profitable remaining

    o Surf-and-turfs: Successful business model

    B2B

    o Marketplaces: Gaining importance in some industries

    o Auctions: Popular in B2C; but much more important in B2B for dynamic price-finding.

  • 2-50Electronic Commerce (WS-02/03)

    References & Further Reading

    [LR99] David Lucking-Reiley: Auctions on the Internet: What’s being auctioned andwhy, http://www.vanderbilt.edu/econ/reiley/papers/InternetAuctions.pdf

    [JBW99] Dawn Jutla, Peter Bodorik, Yie Wang, Developing Internet E-CommerceBenchmarks http://www.elsevier.com/gej-ng//10/23/21/28/32/28/article.pdf

    [KF99]: Kumar, Feldman: Internet Auctions,http://www.research.ibm.com/iac/papers/auction_fp.pdf

    [Rappa02a] Michael Rappa, Business Models on the Web,http://digitalenterprise.org/models/models.html

    [Rappa02b] Michael Rappa: Managing the Digital Enterprise,http://digitalenterprise.org/

    [RegTP00] Registrierungsbehörde für Telekommunikation und Post,www.regtp.de/