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The division and specialization of labor has been a force against the problem of scarcity . Trade and Markets Specialization only makes sense , though , if workers can use the pay they receive for doing their jobs to purchase the other goods and services that they need . In short , specialization requires trade . You do not have to know anything about electronics or sound systems to play music-you just buy an iPod or MP3 player , download the music and listen .
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.