 Other distributive theories of justice take a less procedural approach than Rawls. They are directly concerned with the kinds of outcomes a just society should pursue. These theories differ in the outcome metrics they adopt—the “currency” of distributive justice (Cohen 1989). Some adopt a resource metric (Dworkin 1981b); still others, a metric based on opportunities for welfare (Arneson 1989) or access to advantage (Cohen 1989). Finally, capability theories assess outcomes not only by the goods or resources that people have, but also by what people are able to do with what they have (Nussbaum 1990; Sen 1980). Such outcome-oriented theories may be more or less demanding, depending on whether they require equality or merely priority for the worst-off, and on whether they support equality of a sort that may not require the significant redistribution of goods or resources.