If your purchases of shoes increase from 9 pairs per year to 11 pairs per year when your income increases from $19,000 to $21,000 a year, other things equal, then, for you, shoes are considered a(n): a) normal good. b) inferior good. c) complementary good. d) substitute good.

Option (a) is correct.

Explanation:

Here, shoes are normal goods as there is a positive relationship between the income level of the consumer and the quantity demanded for shoes. It can be seen that as the income of the consumer increases from $19,000 to $21,000 then as a result the quantity of pairs of shoes demanded increases from 9 to 11 pairs. Normal goods are generally have positive income elasticity of demand.

Therefore, the shoes are normal goods in this case.