Definition of business clarified to exclude Central, State and local public authority activities, affecting GST applicability. An explanatory proviso is added to the State Tax (Rate) notification specifying that, for item (vi) at serial number 3, the term 'business' does not include activities or transactions undertaken by the Central Government, a State Government or any local authority when they are acting as public authorities; the State exercised its GST Act powers to clarify scope and applicability and made the amendment effective as notified.