Final answer:
Complementary goods are often used together; an increase in demand for paintbrushes, paint rollers, and painter's tape during a paint sale shows they are complementary.
Explanation:
Complementary goods are goods that are often used together; when the price of one increases, the demand for the other increases. In the case of the hardware store sale on paint, the increased demand for paintbrushes, paint rollers, and painter's tape indicates that these items are complementary to paint. This rise in demand is explained by the concept of complementary goods.
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