During the past 25 years, the capability approach, developed by Amartya Sen and Martha Nussbaum, has come to play a major role in political philosophy and normative economics. This approach has gained much support, among academics as well as among international agencies and non-governmental organizations, at the expense of competing resourcist and welfarist approaches exemplified, respectively, by John Rawlss theory and utilitarianism.
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Thomas Pogge (2002) studied this question.