 The equality required in the economic sphere is complex, taking account of several positions that – each according to the presumption of equality – justify a turn away from equality. A salient problem here is what constitutes justified exceptions to equal distribution of goods, the main subfield in the debate over adequate conceptions of distributive equality and its currency. The following factors are usually considered eligible for justified unequal treatment: (a) need or differing natural disadvantages (e.g. disabilities); (b) existing rights or claims (e.g. private property); (c) differences in the performance of special services (e.g. desert, efforts, or sacrifices); (d) efficiency; and (e) compensation for direct and indirect or structural discrimination (e.g. affirmative action).