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We shall see in the following sections that proportionality of some sort between giving and receiving or between contributions and rewards plays a role in formulations of distributive justice, at least in certain situations. In the following sections, we shall discuss, based on questionnaire–experimental investigations, aspects of needs (section 2), aspects of effort and productivity (section 3), the function of the veil of ignorance (section 4), and, in the concluding section 5, various other aspects that seem to play a role.