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The economist Amartya Sen has raised concerns over Rawls' emphasis on primary social goods, arguing in Inequality Reexamined (1992) that we should attend not only to the distribution of primary goods, but also how effectively people are able to use those goods to pursue their ends.  Norman Daniels has wondered why health care shouldn't be treated as a primary good,  and some of his subsequent work has addressed this question, arguing for a right to health care within a broadly Rawlsian framework.  The philosopher Gerald Cohen , in If You're An Egalitarian, How Come You're So Rich? (2000) and Rescuing Justice and Equality (2008), criticizes Rawls' avowal of inequality under the difference principle , his application of the principle only to social institutions, and what he sees as his obsession with the using primary goods as his currency of equality. 
These principles are lexically ordered: the first principle has priority over the second; and in the second principle the first part has priority over the second part. For the specific question of distributive justice, as opposed to the wider question of political justice, it is the final stone in the edifice that is crucial: this is the famous difference principle.