BRYAN CAPLAN
May 7, 2013
Keynesian Bets: What's Out There
May 6, 2013
Keynesian Bets Bleg
May 6, 2013
The Pyramid of Macroeconomic Insight and Virtue
May 2, 2013
A Natalist Provision
May 1, 2013
I Was a Teenage Misanthrope
DAVID HENDERSON
May 5, 2013
John Thacker on Vaccinations and the Sequester
May 3, 2013
Chef Rudy's Virtues Project
May 2, 2013
My take on Reinhart and Rogoff
May 1, 2013
Medicare Kills a Program


If I have to take out loans and borrow against the equity in my house just to cover normal expenses you could call that sustainable because I am doing it, but it can only last as long as my credit rating. Since this cannot last, I would say unsustainable is a better word.
I think the blogger may be referring to crossing the arbitrary, but important, milestone of 90% debt-to-GDP ratio. Carmen Reinhart and Kenneth Rogoff write of this threshold: "Above 90 percent, median growth rates fall by one percent, and average growth falls considerably more. We find that the threshold for public debt is similar in advanced and emerging economies…"
I think the author is commenting on a debt spiral: chronic deficits will balloon the public's debt, reducing growth and tax revenues, increasing interest payments - causing further debt, which is unsustainable.