As I said earlier, as a general matter, the tax changes or the effects of changes or of signing of new tax treaties is not generally costed as an independent matter. When there's a change in our treaty policy that has a material fiscal implication, it is costed. That was the case with the elimination of arm's-length interest and the elimination in the Canada-U.S. treaty of non-arm's-length interest, and that was costed.
There hasn't been costing done specifically on the other measures themselves, but many of them, arbitration being an example, and many of the understandings expressed in the other annex accompanying the protocol would not be considered to have a material fiscal cost.