Rohatinski completes his review of relations by presenting equilibrium relations. He shows how, in normal economic reproduction over the flow of events and processes, equilibrium relations represent the links that serve to harmonise value and purpose, as well as how partial equilibriums are necessary to ensure the overall equilibrium of the system. The author concludes by discussing how equilibrium relations comprise the framework for causal and structural relations and arguing that they are essential in providing linkages among all economic categories within a system and regulating the functioning of the system.