01:220:102 Chapter Notes - Chapter 4: Market Power, Externality, Economic Surplus

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Willingness to pay: max price which consumer would buy a good at. Individual consumer surplus = willingness to pay - price paid. Occurs when buyer pays less than their willingness to pay. Total consumer surplus: sum of individual consumer surpluses. Generated by purchases of a good at any given price is equal to the area below the demand curve but above said price. Consumer surplus is used to refer to both individual and total. Change in price will increase/decrease consumer surplus. When price changes, the change in consumer surplus is the difference between the new area under the curve and above the demand curve, with the old. Decrease in price results in increased total consumer surplus(and vice versa) Cost: lowest price at which a potential seller is willing to sell at. Individual producer surplus: net gain of seller, difference between price sold at and cost. Total producer surplus: sum of individual producer surpluses.

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