The limits of nonideal duties: a partial vindication of fair shares

Abstract

ABSTRACT Does the failure of others to comply with collective duties create duties for us to step in and do their share? Defenders of the so-called duty to take up the slack answer this question in the positive. Against their view, defenders of fair shares argue that we only have a duty to contribute our fair share to discharging the collective duty. This paper offers a partial vindication of Liam Murphy’s account of fair shares. I argue that three common objections to fair shares fail to rebut Murphy’s account. On the reading I propose, fair shares may ground as – or more – extensive duties towards third parties as the duty to take up the slack. In addition, fair shares provides something that defenses of slack-taking tend to omit – an account of the limits of our nonideal duties. The paper highlights previously overlooked aspects of Murphy’s account and paves the way for future discussions about slack-taking in the domain of global politics.