OBS_VALUE: There is no term of statutory monopoly under the Russian legislation. Services in airports are carried out by entities considered as «natural monopoly», which means the state of the market in which demand is more effectively satisfied when due to technological peculiarities of production there is no competition (due to substantial reduction of the production cost per unit for a service as а result of increasing output), and in which services rendered by natural monopoly entities cannot be substituted with other services in the market, thus causing the demand in the given market to be less responsive to changes in price compared to the demand for other types of services.