من الشائع التمييز بين الضروريات، وسائل الراحة والكماليات؛ الطبقة الأولى تشمل جميع الأشياء المطلوبة لتلبية الرغبات التي يجب إشباعها، في حين أن الثانية تتكوّن من أشياء تلبي احتياجات ذات طبيعة أقل إلحاحًا.

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