"The basic concern of Buchanan (e.g. Buchanan, 1975) is to deny that a libertarian position requires the making of ethical judgments of the kind made by social philosophers who 'play God'. ... It follows that liberalism is about determination of the 'correct' contractual procedures which will allow individuals to consent to intervention by government. That procedure, if it is to be compatible with an individualist position, requires, so far as is practically possible, unanimous consent. Therefore, the common procedure used by economists to identify a social welfare function which is then to be 'maximized' implicitly rejects the individualistic decision-making process, which is the only mechanism through which individuals both express preferences and have them acted upon. To claim that preferences can be revealed and acted upon by governments, unencumbered by individuals' consent, is to presuppose that they and their officials will always act in an enlightened and wholly disinterested way. It is a curious paradox that, in the light of Buchanan's distaste for Keynesian elitism (see Buchanan, 1991), there are elements in Keynes's rather fragmentary thinking on political matters which express a sympathy with an individualistic stance."