Thực tế, thị trường đã dùng cách nào để xác định thời gian lao động xã hội cần thiết cho 1 loại sản phẩm

concurrent jurisdiction is the ability to exercise judicial review by different courts at the same time, within the same territory, and over the same subject matter. for instance, a domestic violence matter may be heard in either a general civil court or a family court in the same county. whichever court actually exercises its jurisdiction first will do so exclusively.