The public economy of a people has its origin simultaneously with the people. It is neither the invention of man nor the revelation of God. It is the natural product of the faculties and propensities which make man man.(125) Just as it may be shown, that the family which lives isolated from all others, contains, in itself, the germs of all political organization,(126) so may it be demonstrated, that every independent household management contains the germs of all politico-economical activity. The public economy of a nation grows with the nation. With the nation, it blooms and ripens. Its season of blossoming and of maturity is the period of its greatest strength, and, at the same time, of the most perfect development of all its more important organs.(127) In respect to it, the economic endeavors of any epoch may be said to be represented by two great parties, the one progressive, the other, conservative. The former would hasten the period of the nation’s richest and most varied development, the latter postpone its departure as long as possible; and hence it comes, that a people’s economic decline is sometimes taken for progress, by the former class, and their progress for decline, by the latter. As a rule, the union and equilibrium of these parties are wont to be the greatest at the period of maturity, because, then, intelligence and the spirit of sacrifice for the common good are most general.(128) Finally, the public economy of a nation declines with the people. (_Infra_, § 263 ff.) Section XV. Diseases Of The Social Organism. If the public economy of a people be an organism, we must expect to find that the perturbations, which affect it, present some analogies to the diseases of the body physical. We may, therefore, hope to learn much that may be of use in practice, from the tried methods of medicine.(129) In the diseases of the body economic, it is necessary to distinguish accurately, between the nature of the disease and its external symptoms, although it may be necessary to combat the latter directly, and not merely with a view to alleviation. Following the example of the physician, we should particularly direct our attention to the curative method which nature itself would pursue, were art not to intervene. “The curative power of nature is no peculiar power; it is the result of a series of happy adjustments, by means of which the morbid perturbation itself sets in motion the springs which may either destroy the evil or paralyze its action. It is, in fact, nothing but the original power which formed the body and preserves its life in contact with the external causes of perturbation and the internal disorder provoked by these causes.” (_Ruete._) Chapter II. Position Of Political Economy In The Circle Of Related Sciences. Section XVI. Political Or National Economy.