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THIRD-DEGREE PRICE DISCRIMINATION: A form of price discrimination in which a seller charges different prices to groups that are differentiated by an easily identifiable characteristic, such as location, age, sex, or ethnic group. This is the most common type of price discrimination. This is one of three price discrimination degrees. The others are first-degree price discrimination and second-degree price discrimination.

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TOTAL COST AND MARGINAL COST

A mathematical connection between marginal cost and total cost stating that marginal cost IS the slope of the total cost curve. This relation between total cost and marginal cost is also seen with total variable cost. The slope of the total variable cost curve is marginal cost, as well. The relation between total cost and marginal cost is but another in the long line of applications of the total-marginal relation.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club trying to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for small children selling products door-to-door.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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