Economic Definition of joint demand. Defined.
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Term joint demand Definition: 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.