A method of transacting sales over a computerized network defining a product desired to be purchased by a plurality of purchasers. A plurality of database records are produced and stored, each corresponding to a correlation between the product and a respective one of the purchasers. A cost-of-bid price is calculated in response to a first time rate at which the plurality of database records are accumulated in the database memory during the storing. The process is repeated to produce a cost-of-bid price that varies in time in response to the time rate of accumulation of the database records.
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