Which one of the following best illustrates the concept of derived demand?
A minimum wage worker tends to buy more off-brand products than do more highly paid professionals.
A windshield company has to step up production because auto sales are increasing.
A grocery store is selling more fresh fruits and vegetables because people are improving their diets.
Restaurant sales are rising because unemployment is falling.
Retail stores have higher sales around the holiday season than in other seasons of the year.