Abstract :
In this case it has been tried to detect the market structure of the mobile companies who has
authorisation on communication sector at Turkey. For the evaluation Herfindahl –Hirschman
Concentration Ratio and sectoral pointers used as basis. On this case of sectoral competition and
market infrastructure, basic pointers of the market, specific properties and Herfindahl-Hirschman
Ratio; it has been understood that it carries the properties of the heavy oligopolist and non competitive market
Keyword :
GSM ?irketleri, Oligopol Piyasa, Yo?unla?ma Oran?, Rekabet