There is, however, also a second issue that is relevant in discussing relation between actual behaviour and the choice of institutions. This issue, which was introduced in the last chapter, concerns Rawls's pre¬sumption that once the social contract has been arrived at, people would abandon any narrow pursuit of self-interest and follow instead the rules of behaviour that would be needed to make the social contract work. Rawls's idea of 'reasonable' behaviour extends to the actual conduct that can be presumed once those chosen institutions - unanimously chosen in the original position - have been put in place. Quite demanding assumptions are made by Rawls on the nature of post-contract behaviour. He puts the issue thus in Political Liberalism: