 In making their decision, the parties are motivated only by their own rational interests. They do not take moral considerations of justice into account except in so far as these considerations bear on their achieving their interests. Their interests again are defined in terms of their each acquiring an adequate share of primary social goods (rights and liberties, powers and opportunities, income and wealth, etc.) and achieving the background social conditions enabling them to effectively pursue their conception of the good and realize their higher-order interests in developing and exercising their moral powers. Since the parties are ignorant of their particular conceptions of the good and of all other particular facts about their society, they are not in a position to engage in bargaining. In effect they all have the same general information and are motivated by the same interests. 