Should Canada eliminate interprovincial trade barriers?

Canadians can often trade more freely with other countries than across their own provincial borders. Differing regulations, licensing regimes, and restrictions on goods like alcohol cost the economy tens of billions of dollars a year by most estimates, and momentum for reform has grown as Canada looks to strengthen its internal economy. Supporters argue free internal trade is an obvious win that would lower prices and boost growth. Opponents note that some barriers protect provincial industries, safety standards, and revenue streams that provinces are reluctant to give up. Should Canada eliminate interprovincial trade barriers?