We do have international unions that are mostly cross-border between Canada and the United States, and they co-operate a fair amount. They've been working together again to spread this message about how integrated the labour markets are.
One of the important things that we could do in NAFTA is to improve the labour mobility. There are electricians who live in Windsor or nurses who live in Windsor who work across the border, so giving them the opportunity to do that in a way that makes sense would be good for both economies, because sometimes there are contracts and they need lots of electricians on the Windsor side, and sometimes they need lots on the American side. There are attempts at that.
I also think there are international rules about cross-border bargaining that we could work on that are separate from NAFTA.