Kocsis, V.

access profit consumer access fee market price brand loyalty network entrant consumer surplus equilibrium share cost difference surplus market share difference cost-based access fee loyalty brand industry profit function result industry asymmetry condition model figure demand market shares access mark-up competition termination access fees substitution effect cost-based 2 2 preference firm i 1 2 cost asymmetry welfare consumption armstrong paper increase charge termination cost advantage curve c 0 qi telecommunication mark-up reaction curve moves access price regulation equilibrium prices network i utility reaction telephony consumption policy proposition order profit function firm 2 telephony policy implications access profit proof service supply side asymmetry change per-consumer access profit measure tinbergen institute demand side asymmetry 2 c 2 interconnection pricing value