As regards the subject of business-a commercial plant, in the case of the purchase of a plant, the subject of performance is always completely unique, characterized by specific qualitative and quantitative characteristics. It is organized set of assets that an enterpreneur has created and that are used to operate business. There is presumtion that everything that is used to operate the business is part of the business. It is collective thing. When it comes to family business, it should be noted that a family business is not a business, but is characterized by the people involved in running it.