Concept:An inferior good is one whose demand falls when a consumer's income rises.
Explanation:In economics, goods are classified based on how demand responds to income changes.
For an inferior good, the income elasticity of demand is negative.
When income increases, consumers can afford superior alternatives.
For example, they may switch from cheap instant noodles to restaurant meals.
As a result, the demand for the inferior good decreases despite the rise in income.
Thus, the correct definition is that demand decreases as income increases.
Options A, B, and D do not describe an inferior good.
Answer:C. decreases as income increases