Ill. Approves Telecom Cost-of-Service Rules
incremental-cost studies to measure the cost of providing individual services and to check for subsidies between service groups. Carriers will also be required to use an aggregate revenue approach to test pricing for competitive and noncompetitive services. Re Implementation of Section 13-507 of the Public Utilities Act, No. 92-0211, July 19, 1995 (Ill.C.C.).