 In extreme circumstances, precipitated by a weather or perhaps a geopolitical event, a catastrophic interrupter could initiated whereby international product prices change by significant amounts, say ±15 cents per litre.This interrupter would be initiated on the day of the price change or the next day when rack prices in Nova Scotia would change.Many critics argue that this method of controlling the price of petroleum products is not in the public interest; these critics include the Liberal Party of Nova Scotia, the Nova Scotia Chambers of Commerce, and vocal critics, mainly in the Halifax Regional Municipality, from the public at large.