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you're saying you think it's possible we can have 5% interest rates and not a massive recession?There would be a massive recession. (And/or inflation.) That's the point.
What is not possible is for the federal government to wind up in a situation where interest payments are dominating the budget, inflation is low, there is political will to service the debt, and yet magically the Congress can't appropriate the money. It can. It always can.
Federal debt servicing is not a constraint on rates per se. It's a constraint because it requires either debt monetization (inflation) or high rates (recession) which are politically difficult.
> inflation is not a problem
How did you interpret "inflation and politics are always the constraint" as "inflation is not a problem"?