Buy$-$Back Contract is an operations management tool in which a manufacturer specifies a $.................................................$ price and a $............................................$ price at which the retailer can return any unsold items at the end of the season. The buy$-$back contract results in an increase in the salvage value for the retailer, which induces the retailer to order a larger quantity. The manufacturer is willing to take on some of the cost of overstocking, because: $$