The seller surplus was $10 from this transaction. The discrepancy between the price paid and a good's marginal value is known as the seller surplus.
Seller surplus plus consumer surplus represents the sum of the economic benefits to each market participant from participating in the production and trade of the good at a price. The producer surplus is equal to the entire revenue from sales of a producer's goods minus the marginal cost of production.
Market price that is higher than the lowest price that producers would normally be willing to pay for their goods results in a seller surplus. Only variable (marginal) costs are deducted from seller surplus.
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