The idea of ¿¿public policy presupposes the existence of a sphere of life that is not private or purely individual but is considered common . It includes the dimension of human activity that requires government intervention or regulation . The increase in the scope of public authorities has been based , among other factors, on the theory of market failures . However , from the seventies of the last century it has set an opposite theory: the theory of the failures of the state. Therefore, when evaluating and implementing public policies should be taken into consideration information provided to us both theories ..