Neither FAR Part 2 nor FAR Part 15 provide an alternative definition specifically for the CCPD, so we use the guidance you cited from FAR 1.108(c). The "highest final priced alternative to the Government" would be the maximum quantity identified in the Schedule at the contract price (if FFP) or at the unit independent government cost estimate (if not FFP). The maximum quantities for every ordering period provide the Government with flexibility to accommodate surges in requirements but do not supersede the contract maximum value.