PRICING RULE.

(a) The commission shall adopt a pricing rule. (b) In adopting the pricing rule, the commission shall: (1) ensure that each price for a monopoly service remains affordable; (2) ensure that each price for competitive service is not: (A) unreasonably preferential, prejudicial, or discriminatory; (B) directly or indirectly subsidized by a noncompetitive service; or (C) predatory or anticompetitive; and (3) require that each service recover the appropriate costs, including joint and common costs, of each facility and function used to provide the service.