Housing dual nature of the commodity, he can be a luxury that can be necessities, luxury villa is a luxury for most people, the general housing is a necessity for most people.

• 房屋这个商品具有双重性，他即可以是奢侈品也可以是必需品，豪华别墅对于大部分人来说是奢侈品，一般住房对于大部分人来说是必需品。