To answer the first part of your question, I think that having a more integrated economic and internal market helps internationally. In this world it is a question of being as competitive as possible and economies of scale.
To start with, the Canadian market is small from an international perspective. If you can produce for the Canadian market subject to national regulations instead of being subject to production within a province, even one of the size of Ontario, that helps you to be more competitive and to be able to export.
We have a number of examples where you can keep the authenticity in a global world. I don't think that having interprovincial barriers would necessarily preserve the local character. You quote the example of Europe, and it is true that there are a lot of distinctive products, but again to have the capacity to export and have larger markets you need a regional identity and this is a contributing factor. I think that overall being able to be more competitive, to reduce costs, and to have the economies of scale are factors that should be taken into account.