Where exactly did you get the 20% number? Why not 100% or 200%?
If we simply outlawed all trade with other nations, perhaps we would do just fine. I suspect however that there would be widespread smuggling in both directions, creating the need for a police state.
With no tariffs, no need for the police.
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>> “With no tariffs, no need for the police.” <<
Which is half of the reason why we have tariffs.
The USA imports $2.4 Trillion per year and collects almost nothing in duties on it. A 20% tariff raises $500B which would balance the budget under the Bush administration. Under a free sending leftest maybe not, but almost.
But your flippant comment can be turned against you What about income taxes? Why can marginal rates be 50%? Why not 90%?