“…According to current regulations in the Republic of Serbia, the defined price should be cost-based, with the possibility of applying additional methods -benchmark and Retail Minus [11]. Since NRA already has a mechanism for defining prices of regulated services, the only question remaining for the regulator is: what is the optimal time period between the adoption of the decision to introduce the new service into the Standard Offer of the SMP operator and the defining of the price level.…”