...who don't know whether to curtail operations and investment or whatever? Even without the EU tariffs, as we see Canadians and EU citizens changing travel plans to anywhere but the US, they can do the same to US products. Their boycotting US products will actually have a wider and deeper effect than tariffs.

then what? No American or European importers will take on that burden of paying 200% tariffs which they would then have to pass on to consumers by raising prices for their good bt 200%.