Often, for estate planning purposes, the value of minority interests in a corporation is « discounted » to reflect the fact that an altruistic third party would likely not pay as much for a minority stake in a corporation as it does for a controlling interest. After all, what is the real say in management that such a buyer hopes to earn? Since an acquired interest is subject to the transfer restrictions set out in the purchase and sale agreement, the purchase price of the minority interest would benefit from an additional value discount. But what is a purchase contract? A purchase and sale agreement is an agreement that, through set and buy options, requires the continued owners of a business to acquire an outgoing owner`s interest in the occurrence of a particular event. .