1. A method for providing inventory information in response to a query having demographic criteria, comprising: determining total query inventory which satisfies said demographic criteria of said query; determining total contract inventory which satisfies criteria of a contract; determining intersection between said total query inventory and said total contract inventory; determining contract delivery target pursuant to said contract; determining total sold inventory using said intersection, said contract delivery target and said total contract inventory; and determining total available inventory using said total query inventory and said total sold inventory.