A valid point.   Canadian milk (and other agricultural)  products command a good price because of their high quality attributes that result in part due to supply management.   But other countries (e.g. Denmark) are also recognized as producing similar quality products.  I think the growth opportunities for Canadian dairy products lie in export markets and we should not too readily assume that  more liberalized trade will make the product more attractive.  Quality can be a basis of differentiation and we should consider how country of origin labeling can play a role in maintaining this market growth.