The only sector where this is generally true is liquor. This is significant, but not massive. Inter-provincial trade barriers for labor, especially licensed

The only sector where this is generally true is liquor. This is significant, but not massive. Inter-provincial trade barriers for labor, especially licensed labor are also quite onerous. But it's still easier for a Quebecois tradesman to work in Ontario than it is for that same tradesman to work in the US.