Natural agents . – Under this name, although somewhat inappropriately, generally accepted, understood the things of nature, useful to mankind, on which rests the action of economic work.
Not everything that supports human life exists, for among the objects around us there are some who are against us, we even produce harm and our death. These objects can not be considered as natural agents, but not fall into that category all things that serve our needs.
Nature provides us means of two kinds: some are called continuous, in close communication with our body and use it without any effort on the activity, these are: air, light, heat and others who say discrete, separate of necessity, which must be applied to it by ourselves, like minerals, plants and most of the beings in the physical world.
Discrete media, such as charitable qualify some expensive because it requires as a condition of employment of labor, are they who are the natural agents in economics. However, it also means free use continuous or discrete and become natural agents, therefore, when applied to some services that do not pay them spontaneously: the air, used as the mill motor and the boat, or to ventilate a mine, the light for photography, are in this case.
In response to the different nature of the natural agents, often divided by economists in appropriate and inappropriate. The ones in effect, land mines, animals, etc.,-Susceptible not only to property but it is a condition necessary for its use, while others-the sea, electricity, etc.,-domain or reject any unique application, it would be useless, moreover, as there are in unlimited quantity and can meet at par all needs .