Complement

A number or quantity of something, especially that required to make a group complete. In economics, A complementary good is a good whose use is related to the use of an associated or paired good. Two goods (A and B) are complementary if using more of good A requires the use of more of good B. For example, the demand for one good (printers) generates demand for the other (ink cartridges).

A Deeper Look at the Demand Curve

This video looks at both the horizontal and vertical methods for reading the demand curve, how demand curves shift, and consumer surplus.

The Demand Curve Shifts

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.
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