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Normal Good
A normal good is one whose demand increases as consumer income rises and decreases when consumer income falls, holding other factors constant.
Inferior Good
A type of good for which demand decreases as the income of consumers increases, opposite to normal goods.
Complements
Complements are goods or services that are used together, so that the consumption or use of one increases the demand for the other.
Durable Good
A type of good that does not quickly wear out and is capable of being used for a period of time, often years, before needing replacement.
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