The manager of a large chain recently spoke to a group of college students about making it in the business world. He focused particularly on the importance of fulfilling the purpose of the business organization: that is, to produce and market profitable products needed by society. In so doing, he indicated that a stockholder, not the society as a whole, invests in a corporation to earn a return on his or her investment and that a firm is legally obligated to act in stockholders' interests. What concept do the manager's comments reveal?