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A good whose demand decreases when consumer income rises, unlike normal goods, for which the opposite is observed.
An inferior good is a good or service where your demand goes down when your income goes up, and vice versa.
This video looks at both the horizontal and vertical methods for reading the demand curve, how demand curves shift, and consumer surplus.
How do increases or decreases in demand affect the demand curve? An increase in demand means an increase in the quantity demanded at every price.