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A modern economy displays a division of labor , in which people earn income by specializing in what they produce and then use that income to purchase the products they need or want . The division of labor allows individuals and firms to specialize and to produce more for several reasons : a -RRB- It allows the agents to focus on areas of advantage due to natural factors and skill levels ; b -RRB- It encourages the agents to learn and invent ; c -RRB- It allows agents to take advantage of economies of scale .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.