It's natural in the sense that we have a fundamental unalienable right that there be property, that the institution of property exist and be respected by the government.

自然权利是说财产权是基本的不可剥夺的,正因为它是这样的权利，所以有产权制度存在，并被政府所尊重。

耶鲁公开课 - 公正课程节选

There is no institution of property.

毫无产权制度可言。

耶鲁公开课 - 公正课程节选