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必需品在經濟學概念中，被認為是無論收入水準如何變化，消費者都會購買的財貨，需求的收入彈性≤1，因此使這些財貨對收入變化不那麼敏感，缺乏彈性的需求。
一般食物、自來水、衣服、飲料等，醫療，電都是必需品；汽車、保險、汽油、高級餐館等，則是非必需品。
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