1. An inventory management system, comprising: a performance measurement system for measuring performance of a medium in which units of inventory are used; a revenue maximization system which determines a price for said units based on predetermined pricing considerations; a central information storage system for receiving information from said performance measurement system and revenue maximization system to generate scenarios wherein various combinations of units are grouped together to meet a buyer's criteria; and a scenario planner to display the various scenarios generated by the central information storage system.