The Schedule can be changed by:

This question is similar to post_id 26260, reinforcing the mechanism for modifying the Act's Schedule. The correct answer is Punjab Government via notification. The power to change or update the Schedule of an Act, particularly one dealing with essential commodities, typically resides with the provincial government. This is done through an official 'notification' to allow for flexibility in adapting to changing circumstances without requiring a full legislative amendment. Options such as Governor only, Market Committee, or Court order do not possess the executive authority to unilaterally change the Schedule of an Act.