A rising debt-to-GDP ratio is of concern.
The level of that debt-to-GDP ratio also has to be considered to decide whether it's sustainable or not. Not just Jason himself, but other voices like the IMF and the Canadian Taxpayers Federation, have said that the current debt tracks are sustainable. I look forward to seeing the models of the PBO that would contribute to a view that they are unsustainable, but I don't think even the PBO is there at this point in time.