83 Ill. Adm. Code 791.90
Subsidy Tests
Section 791
Section 791.90 Subsidy Tests
a) A service is not being subsidized if the total revenue
resulting from the service equals or exceeds the long-run service incremental
cost of providing that service.
b) A group of services is not being subsidized if the total
revenue resulting from the group of services equals or exceeds the long-run
service incremental cost of providing that group of services.