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Auction (auction) - its basic difference from the on-line catalogue consists that the price is not fixed, and is established during the tenders. Sources of the income the same, as for catalogues.
Stock exchange (exchange) - trading the Internet-platform where the price is adjusted by a supply and demand therefore it is subject to strong changes. Stock exchanges allow the ecommerce companies to trade anonymously, that is important, for example, in a power industry where publicity can damage a competitive position of the buyer and the seller and to affect the prices. As sources of the income for stock exchanges the commissions for transactions and a membership due of participants mainly serve.
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