But interest charges are rising by 10% per year

It is no longer the case that they are at their lowest levels ever, but this from Dan Alpert still makes immense sense:

It is time to borrow and invest in infrastructure #LockItIn:

  

How does Brad intend to get a multiplier greater than one?  Treasury is using the long term debt capacity to pay off the credit card, remember, the curve in inverted.

Rates will just pop back up, if Brad and his stimulus drive the ten year above 3%, we shut down. In fact we are planning to possibly shut down in a few weeks. So, already we are not prepared for the interest charges we have today, government is not functioning.

Brad has no theory, he just assumed the multiplier is always great than 1, and that has never been the case; Cristina's fake research to the contrary. we cannot afford the interest charges we have.