Rasim Ozcan Turk Telekom   Akatlar Mah. Prof. Dr. Kaya Cilingiroglu Cad. No. 10. Etiler Besiktas, Istanbul 34337 Turkey   ozcanr@gmail.com   www.rasimozcan.com           JEL Areas: D4 : Market Structure and Pricing: General D0 : Microeconomics: General