Intra-OIC-membership has been blessed by diversity of GDPGross Domestic Product (GDP)-related values. Such an economic state of the member countries opens opportunities for intra-OIC and sub-regional economic co-operation and co-ordination along the path of progressive evolution to OIC-ICM. Yet, it should be remembered that GDPGross Domestic Product (GDP)-related values do not by themselves represent the total health of the economies. Rather, in respect of the principal objective criterion of wellbeing, GDPGross Domestic Product (GDP)-values are internal factors that integrate with other variables as factors in the wellbeing functionWellbeing function as circular causationCircular causation variables. The derived system of such circular causationCircular causation relations together forms the general equilibriumGeneral equilibrium system of goals as so explained by these derived simulacra of circular causationCircular causation relations. In this system of derived factors of relations, there exist the specific ones in GDPGross Domestic Product (GDP)-values relating to other wellbeing variables.