Concession, in many states, is undervalued, but in fact is a contract whereby the State or territorial administrative units of assignment (send) an investor (natural or legal person, including foreign) in return for a fee, the right to conduct activity prospection, exploration, public services, exploit movable and immovable assets of public property or the administrative territorial units that the regulations are removed entirely or partly from the civil circuit, and the right to perform certain types of activities, including those representing state monopoly, taking over the management of concession object, presumptive risk and financial liability.