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b -RRB- It encourages the agents to learn and invent ; c -RRB- It allows agents to take advantage of economies of scale . Division and specialization of labor only work when individuals can purchase what they do not produce in markets . Learning about economics helps you understand the major problems facing the world today , prepares you to be a good citizen , and helps you become a well-rounded thinker .
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.