Why have a long-term debt target other than zero? Debt is expensive. We'll spend 7 Trillion dollars servicing this debt over the next decade. The only argument

Why have a long-term debt target other than zero? Debt is expensive. We'll spend 7 Trillion dollars servicing this debt over the next decade. The only argument in favor of this is that the debt spending was an "investment" which is paying off, but it's hard to believe that's true about any of this spending, with the only exception being the Keynesian stimulus spending. But even Keynes thought the stimulus debt should be paid off in due course.