How does the central government's regulation over weights and measures affect state-level competencies?
The central government's regulation over weights and measures affects state-level competencies by placing certain restrictions on the states with regard to this subject. This is evident from Entry 39 in the context, which mentions "weights and measures" being subject to the provisions of Entry 50 of List I (Central List) of the Seventh Schedule. This implies that while states have some autonomy over weights and measures, their powers are limited by the central government's authority on this matter as per the mentioned entry in List I.