In the exercise of its power to prescribe just and reasonable rates for the transportation of passengers or property by common carriers operating under a Certificate of PC&N, the Commission may give due consideration, among other factors, to the need in the public interest of adequate and efficient transportation service by such carriers at the lowest cost consistent with the furnishing of such service and to the need of such carriers for revenues sufficient to enable them, under economical and efficient management, to provide such service.
S.C. Code Regs. § 103-194