“Economic phenomena may be regarded from three points of view: first, from the point of view of their repetition, which has to do chiefly with the propagation of habits of consumption, called needs, and of the corresponding habits of labor; second, from the point of view of their opposition, which includes principally the contests of producers among themselves by acute or chronic competition, during strikes, or crises of overproduction,—or contests of consumers among themselves, through sumptuary laws, aristocratic or democratic, or monopolies of consumption over which they dispute in a thousand ways, in time of famine, or scarcity, or any form of underproduction,—or contests of producers with consumers, through their attempts to exploit one another, monopolize prices, or laws regulating the maximum price, municipal tariffs, or protectionist rights, etc.; third, finally from the point of view of their adaptation, always being renewed and always incomplete, which embraces the series of successful inventions, fortunate associations of ideas from which proceed all fruitful associations of men, from the division of labor and of commerce, an association spontaneous and implicit, to industrial, commercial, financial, and syndical societies, etc.” [151] It is through the second aspect that the economic life can give a direct explanation of crime; that which is given by the other two is only an indirect explanation. That is to say, each invention gives rise to a contest among producers, and the progress of manufacturing creates the possibility of satisfying needs, but at the same time makes those who for want of the means cannot satisfy them, feel their needs all the more strongly. Every individual must satisfy a certain number of needs which have their marked recurrences. A peaceful and honest society will be one in which the great majority of the persons who compose it have, in measure, the means of satisfying these needs. “Regular habits of consumption and production form the first condition for good moral health whether individual or collective, just as regular digestion is the foundation of good physical health. Those who are irregular become easily the ‘déclassés.’ Nothing is more contagious than disorder.” [152] Hence, then, comes the importance for criminality of social crises, since during these production and consumption are deranged. According to Professor Tarde, the social contradictions, which are the chronic crises of societies, can be the sole causes of criminality. If a society succeeds in avoiding every internal contradiction there can hardly be any further question of crime.