Absolutely not!  The Canadian dollars value is a powerful lever through which we can encourage economic growth in downturns. Just as has been seen in Europe, the common Euro has impeded many nations ability to adapt to economic downturns. If we had no duties, Canadians could avoid paying HST by purchasing items from the US and it would hurt Canadian business tremendously and Government coffers. If we eliminated borders, guns from the US would easily get into Canada and other criminal issues would abound. In other words, your suggestion would make thinks simpler, simply a disaster for Canada.