In economics, a complementary good is a good whose appeal increases with the popularity of another good, which is known as its complement. Technically, it displays a negative cross elasticity of demand and that demand for it increases when the price of another good decreases.
In economics, a complementary good is a good whose appeal increases with the popularity of another good, which is known as its complement. Technically, it displays a negative cross elasticity of demand and that demand for it increases when the price of another good decreases.
Source: Wikipedia "Complementary good" · CC BY-SA 4.0
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