The demand for most products varies directly with changes in consumer incomes.Such products are known as:

A) complementary goods.
B) competitive goods.
C) inferior goods.
D) normal goods.

Normal Goods

Goods whose demand increases when consumer income rises, and falls when consumer income decreases.

Consumer Incomes

The total amount of income earned by consumers, influencing their spending patterns and demand for goods and services.

Complementary Goods

Goods that are consumed together because the use of one enhances the use of the other, such as computers and software.