需求的所得彈性 在經濟學中,指衡量一種財貨的需求對消費者所得變化的反應程度[1]。劣等財需求的所得彈性為負值,即如果所得增加,對起需求則會隨之減少。
劣等財、必需品和奢侈品中,所得彈性為零者為所得中性物(中性財),所得彈性為負的財貨定義為劣等財,所得彈性為正的物品定義為正常財。
參考資料
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