Inferior Good Definition
The term “inferior good” describes a good for which demand decrease as incomes increase. They are the opposite of “normal goods,” which are goods for which demand increases as incomes increase (e.g. organic food, cars, or name-brand products).
Inferior and normal goods are in a relationship with one another—in other words, inferior goods exist when demand for alternatives to a particular good (normal goods) increases with increased income.
In the event of a recession, as incomes fall pretty much across the board, demand for inferior goods increases (and demand for normal goods decreases). Likewise, when the economy is stronger, the demand for inferior goods decreases (and demand for normal goods increases).
See this table for a clear explanation of the relationship between income increase/decrease and demand for both inferior and normal goods:
|Demand for inferior goods||Decrease||Increase|
|Demand for normal goods||Increase||Decrease|
What is an Inferior Good?
“Inferior” in this context doesn’t automatically mean low-quality, although this is a reasonable assumption to make based on the term. Inferior goods can be of high or low quality, although they are admittedly often lower quality. Inferior goods are simply those for which demand decreases among those whose income increases—no matter the goods’ quality.
Inferior Good Example
Here are some examples of inferior goods.
- Canned vegetables: Those with lower incomes tend to rely on canned vegetables, while those who make more money pay more for fresh vegetables.
- Fast food: When people make less money, they often choose fast food. When they make more money, they tend to eat at more expensive restaurants.
- Public transportation: When people make more money, their demand for cars/taxis (the normal good in this situation) increases.
- Cheap motels: Those who can afford to stay at a more expensive hotel with more attentive service, more comfortable beds, etc.
- Generic and store brands: When people have less money, they choose generic/store brands, as these are typically much cheaper. With more money, they often choose the normal good of name-brand products.
Inferior Good Graph
In the graph shown above, as average income per week increases from $750 to $1000, the demand for the inferior good decreases from 200 to 150 units.
Relationship with Income Elasticity of Demand (YED)
Income elasticity of demand describes the degree to which demand responds to changes in income (increases or decreases). It demonstrates whether a good should be considered a luxury or basic need. It is calculated as follows:
Income elasticity of demand (YED) = % change in demand ÷ % change in income
The income elasticity of demand of an inferior good is negative. Conversely, normal goods’ income elasticity of demand is positive.