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</html><description>There was a self-sufficient economic system in the past. The method of direct production had been practiced in the selfsufficient economic system. Personal specialization developed through direct production. The result of personal specialization is surplus of production. The result of surplus is the barter system. Trade emerged with the barter system. Producing to the market [&hellip;]</description><thumbnail_url>http://astan.lk/al_virtualclassroom/wp-content/uploads/2017/02/Screenshot-343.png</thumbnail_url></oembed>

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