Gerald Seib, in the Wall Street Journal, reports that “There is a cancer eating away at the budget from within, one that steadily drains American wealth, sends much of it overseas and only gets worse over time.”
This is economic illiteracy in spades. The fact is that every single dollar of interest we pay on the national debt comes right back to the pockets of American taxpayers. If you don’t understand that, then you’re not thinking clearly about the national debt.
Suppose the government owes $100 and pays $3 a year in interest. The alternative to paying that interest is to raise current taxes by $100 and pay down the debt. If you do that, taxpayers are going to have $100 less in assets, and will therefore earn less interest on their savings. That costs them (roughly) the same $3 a year.
In other words, the damage was done back when the government spent that $100 in the first place. (Of course, if the $100 was spent wisely, the damage might have been worth doing. Or not.) Once that $100 has been spent, the taxpayers are out $3 a year forever regardless of whether the debt is ever paid off.




Robin Hanson 







