We evolved from beings who had to work hard to feed themselves, find a mate, and raise children. For nomadic societies, there was no point in owning anything that one could not carry, but once humans settled down and developed a system of money, that limit to acquisition disappeared.
也许答案在于我们天性是有目的的人。我们的先祖是必须依靠努力劳动来养活自己、找到伴侣以及把孩子养大成人，我们由此演化而来。在游牧社会，拥有无法搬运的东西毫无必要，但是一旦人们定居下来并且发展起了金钱机制，这种物质占用的限制消失了。