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Describe the three broad themes in friendship.
Complements
Goods that are often consumed together, such that an increase in demand for one leads to an increase in demand for the other.
Substitutes
Goods or services that can replace each other in use or consumption, such that an increase in the price of one leads to an increase in demand for the other.
Marginal Revenue
Marginal revenue is the additional revenue that a firm gains from selling one more unit of a good or service.
Demand Curve
A graph showing the relationship between the price of a good and the quantity demanded by consumers at those prices.
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