Friedrich Hayek wrote long ago that the demand for social justice is a demand for socialism. The different outcomes that occur on the free market are not the product of anyone's deliberate planning or design, and so are neither just nor unjust. It just works out that way on the market. But a centrally determined, consciously driven allocation of incomes and rewards could be described as either just or unjust. depending upon whether it was done properly. But, as Hayek pointed out, only a superhuman intellect could know how to do it properly or which distribution would be just. Inasmuch as no human being on earth is nearly that intelligent, It is better to just leave it to the market.