 Neoliberals also stress that freedom allows people with different ends to cooperate and create peace (Hayek 1978: 111–136). This is an important theme for Buchanan (1975). As a contractarian, he thinks that the goal of agreement on constitutional rules is to end the Hobbesian state of war and secure enough peace to establish mutual gains from exchange. Thus, a second rationale for extensive negative liberties is that they are instrumental for cooperation and peace.