This is an estimate prepared by the Department of Finance, and the department would be in a better position to answer this. It is not so much about the amount of savings that one can afford or not, but rather to make a comparison between the growth of the economy and productivity to see if the two are in balance. The whole concern about long-term fiscal sustainability is that if you spend more than the growth in your economy, then your debt ratio will continue to increase—
On March 5th, 2013. See this statement in context.