Division of labour or specialization is the specialization of cooperative labour in specific, circumscribed tasks and roles, intended to increase the productivity of labour. Historically the growth of a more and more complex division of labour is closely associated with the growth of total output and trade, the rise of capitalism, and of the complexity of industrialization processes. Later, the division of labour reached the level of a scientifically-based management practice with the time and motion studies associated with Taylorism. Basically, it's a working society that does many different jobs. Example: A few people do farming, a few people do pottery, and a few people are blacksmiths. The society works together to make the city wealthier.
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