I guess it's where to start?
The biggest concern is it has to be domestic so it has to be the housing sector. What we don't know is, given the strength seems to be concentrated in cities where you can have reasonable explanations why it's very strong—Toronto, Calgary, or Vancouver—there are underlying structural reasons that you would expect those markets to be strong. We don't know for sure the extent to which there may be overbuilding and overvaluation. We don't know why overvaluation builds and what can trigger it to unravel. That's a thing that worries me domestically.