Distributive Justice and Retributive Justice

The concept of Distributive Justice requires a formulation of proportionality between input and allotment. Thus, for example, if A invests twice as much as B in some enterprise, then A receiving twice as much as B from the profits is 'just'. Now, another common example of such a formulation is so trivial that it is often only implicitly expressed--when the determining factor is that each is simply a single member of a collective, corresponding to which is, therefore, an equal share of an allotment, e. g. in a Rawlsian 'original position'. So, regardless of such variations, fairness in distribution is ultimately based on commensuration between input and receipt, or, in other words, on Retributive Justice. But, the converse does not hold--Retributive Justice is definable independently of Distributive Justice. Thus, though they are typically treated as distinct varieties of Justice, the latter is a special case of the former.