The allocation of benefits and burdens by the economy is not a result of deliberate allocation to specific people. The economy emerged from nature as an Spontaneous order and A spontaneous order has no personal intention. Since No personal intention in a spontaneous order means no justice or injustice, the economy can neither be just or unjust.
References
Hayek, F.A. (1978). Law, Legislation and Liberty, Vol. 2: The Mirage of Social Justice, pp. 31-32. Quoted in: Thomas Sowell. The Quest for Cosmic Justice