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Research using the Facial Action Coding System to determine the specific facial expressions that typically accompany various emotions has determined that
Complement
A good or service that is used together with another good or service, increasing demand for both.
Substitute
A good or service that can be used in place of another good or service, typically because it serves a similar function or satisfies the same needs.
Demand Equation
A mathematical representation of the demand curve, expressing the relationship between the quantity demanded and various factors that influence it, such as price.
Marginal Utility
The supplementary enjoyment or value someone gains from consuming one more unit of a certain good or service.
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