For most goods,purchases tend to rise with increases in buyers' incomes and to fall with decreases in buyers' incomes.Such goods are known as:

A) inferior.
B) direct.
C) normal.
D) indirect.

Goods that tend to see a rise in purchases with an increase in buyers' incomes and a fall with decreases in buyers' incomes are called normal goods. These are goods for which demand responds positively to changes in income. In contrast, inferior goods are those for which demand decreases when buyer incomes rise and increases when buyer incomes fall, while direct and indirect goods are not terms commonly used to describe the relationship between income and demand.