Abstract: Systems and methods for conducting negotiations of commercial transactions. A system includes one or more clients connected to a network, and a negotiation system connected to the network and configured to communicate with the one or more clients. The negotiation system includes a server configured for receiving an offer for the item from the one or more clients, and configured for generating a response for sending to the one or more clients. The negotiation system further includes a data engine configured for dynamically gathering data from one or more information sources, and an analysis engine configured for generating a value associated with the item based on the data from the one or more information sources. The negotiation system further includes a decision engine configured for evaluating the offer based on the value associated with the item, and for providing a result of the evaluation to the server.