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Total Surplus
The total net gain to consumers and producers from trading in a market; the sum of the producer surplus and the consumer surplus.
Consumer Surplus
The difference between the total amount that consumers are willing and able to pay for a good or service and the total amount that they actually pay.
Free Trade
An economic policy that allows goods and services to be traded between countries with few or no barriers such as tariffs or quotas.
Autarky
An economic system of self-sufficiency where a country or region attempts to produce everything it needs without engaging in international trade.
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