1. Brian Barry, ‘Justice and the Common Good’, in A. Quinton (ed.), Political Philosophy, Oxford, 1967, p. 193.
2. T. Hobbes, Leviathan (ed. C. B. Macpherson), London, 1968, p. 312.
3. Brian Barry, Political Argument, London, 1965, Chapter 1.
4. J. Buchanan and G. Tullock, The Calculus of Consent, Ann Arbor, 1962.