Using the Curves dialog boxAuction (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 - 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 companies to trade anonymously that are 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 membership dues of participants mainly serve. .
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