Much of this analysis has relied on the significance of the prerequisites for individual rights (A4') as compared to the requirement of compatibility with the Pareto criterion (A2); other possibilities for achieving consistency have also been discussed. Sen's analysis has generated a literature in economic theory, e.g. Gibbard (1974) and Suzumura (1978), as well as a philosophical analysis of rights, e.g. Nozick (1974) and Dworkin (1978).