Look, by the end of Roman empire, their coin had less than 1% of the original gold content then when they were at the peak of the empire. Their purchasing power collapsed to the point that they left the safety of the empire to move outside the walls and survive on the land to feed themselves. This left them open to invaders later on.

They had taxes then as well. In fact, they realized after taxation that they did not have enough to sustain the extravagances of the city which is why they started money dilution to begin with. Enormous government spending eventually leads to collapse. The point I am making here is that our spending and debt have reached a point now where it is near unsustainable. Raising the interest rate to 7% or higher is no longer a practical reality because our real debt is substantially greater than they were in the Volcker-era. No amount of money printing will bring back the purchasing power of the dollar unless something changes -> supply chains explode, technology advances massively, energy becomes near abundant, etc.