This leaves merchants with no choice. Jango uses a list maintained by Excite Inc. as base for their customer request. Kasbah Kasbah from MIT Lab. Is a multi-agent classified ad system. It attends to both buyers and sellers.
Any user wanting to sell or buy creates an agent and sends it to the centralized marketplace.
Kasbah agents proactively negotiates with both sides in the effort to achieve acceptable deal based on the specified constraints. The latest version contain what they refer to as Better Business Bureau. The Better Business Bureauuses the ratings by both parties at the end of the transactions to determine if they should negotiate with agents whose owners fall below a user specified reputation threshold. This is the stage of determining the price and other terms of the transaction. The advantage is that the burden of fixing price is pushed to the marketplace relieving the merchants of the responsibility.