D looks for this way to incorporate the social components from the beginning of the projects and to identify the nodes and connections previously, so that it is not only gotten to thicken the size of the libraries. 1.3 The public goods For effects of this work and with the purpose of to understand better the responsibility of the State in the matter of prevention and attention of disasters, next I will talk about one of the most elementary and appropriate concepts. Existen some goods that, or are not provided by the market or. if they are it, the amount you provide is insufficient. An example on a large scale is the national defense and another one on small scale, the aid to navigation (like the luminous buoys). These are the calls pure public goods, who has two properties. First of all, nothing costs that another person more benefit of its advantages. Formally, the fact that an additional individual benefit of or, has a marginal or null cost.
It does not cost more to defend to a country of a million and one person who to defend to one of a million. The costs of a luminous buoy do not depend on the number of boats that happen through their neighborhoods. Secondly, generally it is difficult or impossible that it is not enjoyed the public good. If we placed a luminous buoy in a rocky zone so that our boats can sail without danger, it is difficult or impossible to prevent that others naveguen by that zone. If the state policies in the matter of prevention of disasters and urban planning they are able to diminish the risks against the seismic movements, all we benefitted; it is not possible to exclude any person from these benefits (CHAIN: 1999). The security of the citizen and his goods is constituted in a public good.