We contrast property rights (post social rights) and ownership (pre social rights). We call ownership the relation one has with an asset (the pre-social natural right), and property rights the rights that frame the relations one has with others through the medium of the asset (post-social rights). Property rights are economic arrangements to fulfill individual and collective requirements. By contrast, ownership results from the risk exposure of oneself to the use of some assets’ attributes. This distinction allows getting a new theoretical approach on both land property and firm property.