Abstract: A method and a system for providing information about a posting from multiple sources are provided. For example, the method may comprise storing a posting that was submitted by a first user in an online publication system. Then, one or more stored inquiries associated with the posting may be retrieved. Finally, a response is selectively retrieved from a response source. The retrieved response may correspond to the stored inquiry and the posting. The response source is at least one of the posting, the online publication system, the first user, and a user account of a second user.

Abstract: A method of handling negotiations between a seller of an item and prospective buyers of the item is disclosed. A first offer for the item is received. The first offer includes a first item price and a first item quantity. A second offer for the item is received. The second offer includes a second item price and a second item quantity. It is detected that a first prospective buyer submitted a payment corresponding to the first offer before a second prospective buyer submitted a payment corresponding to the second offer. Based on an item quantity of the seller being less than the first quantity plus the second quantity, the seller is notified that the seller has an obligation to provide the first item quantity of the item to the first prospective buyer, but not the second quantity of the item to the second prospective buyer.

Abstract: A method and a system for providing information about a posting from multiple sources are provided. For example, the method may comprise storing a posting that was submitted by a first user in an online publication system. Then, one or more stored inquiries associated with the posting may be retrieved. Finally, a response is selectively retrieved from a response source. The retrieved response may correspond to the stored inquiry and the posting. The response source is at least one of the posting, the online publication system, the first user, and a user account of a second user.