This thesis carried out research mainly focused on the area of competition in telecommunications service market and asymmetric regulation. To apply asymmetric regulation, determining dominant player is the most important thing to be performed. From now on, people have evaluated competition status only in same telecommunications service market to determine dominant player. But recently environments are being changed rapidly - there are two major changes in telecommunications service market. First, mobile substitutes fixed market especially in local and long distance markets. Second, Internet phone substitutes international market. Even though Internet phone is in start-up state, this substitution will be accelerated because of their price gap.
Recognizing these changes, the study focused on redefining relevant market that is not limited to same service market. Three redefined markets, local-mobile, long distance-mobile, international-Internet phone, that show high substitution rates in these days are evaluated. This thesis provides three steps to find the optimal way of applying asymmetric regulation considering of these changes. First, redefine relevant market, local-mobile, long distance-mobile, international-Internet phone. Second, evaluate market competition status and find dominant player. Third, apply proper asymmetric regulation if needed.
