I wonder why this was Gotlieb's third point "We cannot deepen our trade with foreign customers if we do not have the products to sell."  It is the key and only point.  Other than rocks and minerals, (with perhaps the ephemeral real estate market thrown in the mix) there is, unfortunately for us, nothing we produce that the rest of the world needs.  Our branch-plant "manufacturing" base in Ont and Que will be gone, zip, nada, if the border thickens.