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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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ARC ELASTICITY

The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.

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Today, you are likely to spend a great deal of time wandering around the downtown area trying to buy either a pair of blue silicon oven mitts or a coffee cup commemorating the 2000 Olympics. Be on the lookout for mail order catalogs with hidden messages.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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