A method and system for the determination of optimal pricing and allocation of securities in an open, competitive environment. The method and system may also be used in developing pre-markets of other items that are difficult to price and allocate in a competitive manner, such as the underwriting/securitization of contracts for property; future revenue/earning streams from an asset and/or group of assets; underwritten insurance portfolios, intellectual property and other goods and services. The system of price optimization and allocation is accomplished by interactive feedback of information using a display and including competitive participation of individual members of the public (and/or their agents) or institutional buyers over a data network e.g., the Internet, uncovering the nature and identification of demand in a self-organizing fashion. Demand emerges through participants' interaction with the system and with each other, via a graphically-supported, interactive reservation process. Earlier accepted indications of interest (e.g., bids) may be canceled or modified by later bids.