Economic surplus - Wikipedia
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If there is a surplus of goods, that is, people can only sell part of the goods at market prices, and producer surplus will decrease. Obviously, the sum of the producer surplus of all manufacturers in the market constitutes the producer surplus of the entire market.
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Surplus value - Wikipedia
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In Marxian economics, surplus value is the difference between the amount raised through a sale of a product and the amount it cost to manufacture it: i.e. the amount raised through sale of the product minus the cost of the materials, plant and labour power.