(iii) Upon deciding the establishment and the jurisdictional district of the Public Employment Security Offices, sufficient consideration is required in respect of, in addition to the standards provided in the preceding 2 items, not only the local necessities but also the relationship with other local areas or with the whole nation, so that the national labor force can be optimized to the fullest extent, such as establishing the Public Employment Security Office where necessary in the area where there are few plants, factories or other workplaces but which is the source of labor supply to other areas, or the area where there are plants, factories or other workplaces but such workplaces may not secure appropriate workers residing within commuting distance.