noun
inferior good
Economics term: a good whose demand falls when consumer income rises. Contrast with 上級財 (normal good).
経済学では、所得が増えると需要が減るものを下級財と呼ぶ。
In economics, goods for which demand decreases as income increases are called inferior goods.
A Giffen good is a special type of inferior good where demand rises when price rises, due to income effect outweighing substitution effect.
Compound of 下級 (lower class) + 財 (goods). A direct translation of the English economics term 'inferior goods'.