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Welfare economics
the study of how the allocation of resources affects economic well-being
Willingness to pay
the maximum amount that a buyer will pay for a good
Consumer surplus
the amount a buyer is willing to pay for a good minus the amount the buyer actually pays for it
The area below the demand curve and above the price measures the
Marginal buyer
the buyer who would leave the market first if the price were any higher
Cost
the value of everything a seller must give up to produce a good
Producer surplus
the amount a seller is paid minus his cost of production.
The area below the price and above the supply curve
Marginal seller
the seller who would leave the market first if the price were lower
Total surplus
Consumer + Producer suprlus