Obviously, it depends what our competitors do. If Canada were the only place in the world acting, it might well be that prices much above $15 would affect competitiveness. But the fact is other countries are acting and may act soon. Right now, my expectation is that the U.S. will end up with higher carbon prices than we have, given the current pace.
It is also important to say that it is very rare to see companies actually move because of environmental constraints. Companies choose locations based on labour costs, access to raw materials, etc., and despite the talk, you don't very often see companies really move because of environmental regulations.