I don't have an answer to that question, but there's nothing mechanical about it. Each of these decisions is a complex combination of risks, and we have to weigh the risks of waiting longer against the costs associated with doing something more immediate.
Certainly, as the first part of your question alludes, if we were to be easing further, we'd be very close to using unconventional tools. That's of course not a decision we would take lightly.
When we have the Canadian economy operating on two tracks, one track doing reasonably well and in certain regions doing quite well, and others adjusting through something quite difficult, it's not as easy as it sounds to speed up the fast growing parts to offset the slow growing parts. If everything were the same it would be an easier decision in many ways to do that kind of thing.
This is what I mean by the uncertainties. They are multi-dimensional. We do a fresh judgment every time. Again, we can't plan it that way. Our best plan right now, we think, is to wait for the next 18 months or so.