It's one way of ensuring that you bring public debt under control.
Historically, Canada seems to have, in a way, done reasonably well through a mechanism of fairly broad fiscal targets. They're not terribly precisely defined. That kind of system can work if there's sufficient political will behind those broad objectives. It can also be useful to additionally have more precise fiscal rules. This can help governments keep things on track.
Our recommendation is that this could be thought of to help bring the public debt burden down from the levels it's reached with the crisis.