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JOINT DEMAND: Demand for two or more commodities that are either complements-in-consumption or complements-in-production. Joint demand results because two or more commodities are used together either to satisfy wants and needs or to produce goods and services. Because the commodities are used jointly, the demand for one good is necessarily based on the use and availability of another good. If, for example, you enjoy milk and brownies as complements-in-consumption, but the bakery is out of brownies, then your demand for milk is also likely to decline.

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MARGINAL REVENUE

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a firm equates marginal revenue and marginal cost.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club looking to buy either a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or decorative garden figurines. Be on the lookout for pencil sharpeners with an attitude.
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In 1914, Ford paid workers who were age 22 or older $5 per day -- double the average wage offered by other car factories.
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