Sen critiques and attempts to revitalize "A Theory of Justice" in "The Idea of Justice" (2009). He credits Rawls for revitalizing the interest in the ideas of what justice means and the stress put on fairness, objectivity, equality of opportunity, removal of poverty, and freedom. However, Sen, as part of his general critique of the contractarian tradition, states that ideas about a perfectly just world do not help redress actual existing inequality. Sen faults Rawls for an over-emphasis on institutions as guarantors of justice not considering the effects of human behaviour on the institutions' ability to maintain a just society. Sen believes Rawls understates the difficulty in getting everyone in society to adhere to the norms of a just society. He also claims that Rawls' position that there be only one possible outcome of the reflective equilibrium behind the veil of ignorance is misguided. In contrast to Rawls, Sen believes that multiple conflicting, yet just principles may arise and that this undermines the multi-step processes that Rawls laid out as leading to a perfectly just society.