sovereign debt servicing costs
Where can I find sovereign debt servicing costs of USA EU etc as a ratio to GDP ? I have heard that Japan has a debt servicing cost of 4% of GDP which means that the total sovereign debt is irrelevant , only the ability to service the debt is important. If this is correct then the debt capital is paid off in time by issuing more bonds at negative real interest rates . Is this one reason for QE ?
I don't think public debt servicing costs matter at all to a sovereign. They can just print more money to pay it off. There could be inflationary side effects to this, of course.