I'll let my colleagues respond in introducing their comments.
To my knowledge, we have not had a lot of trade disputes over that sort of thing, and that's a very valid point. The disadvantage, though, is that there is an importance in these instruments in their own right. It's very time-consuming to have meetings between government officials and so on, but the advantage is that their tax lawyers get to know our tax lawyers, their investment protection authorities get to know ours, and this economic relationship is built up. So there's more to it than simply the protection that's afforded. It's a network of contacts, and that is of service not only government to government, but also government to business.
Dwain, maybe you could expand on that.