必需品在经济学概念中,被认为是無論收入水平如何變化,消費者都會購買的財貨,需求的所得彈性≤1,因此使這些財貨對收入變化不那麼敏感,缺乏弹性的需求。
一般食物、自來水、衣服、飲料等,医疗,电都是必需品;汽車、保險、汽油、高級餐館等,則是非必需品。
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