Alternately:
All previous economists, and all previous Fed chairs were wrong, and if the US is a prosperous country, then that is just dumb luck and happened despite 200 years of wrongness.
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Hmm, doesn’t seem likely.

Clearly, the present is a radical departure from the historical norms. A risky and never-tested experiment.

Maybe I am wrong to be pessimistic about the untried experiment, but an untried experiment is exactly what it is.