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Lunch Money By Andrew Clements Economics Book SS5E1 The student will use the basic economic concepts of trade, opportunity cost, specialization, voluntary exchange, productivity, and price incentives to illustrate historical events. d. Explain how voluntary exchange helps both buyers and sellers (such as how specialization leads to the need to exchange to get wants and needs). e. Describe how trade promotes economic activity (such as how the Panama Canal increases trade between countries).