The separation of employments, the division of labor, which results from the faculty of exchanging, causes each man, instead of struggling on his own… - Frédéric Bastiat

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The separation of employments, the division of labor, which results from the faculty of exchanging, causes each man, instead of struggling on his own account to overcome all the obstacles that surround him, to combat only one of them; he overcomes that one not for himself but for his fellow men, who in turn render him the same service.