I only thought about this today (!)

is this right:

if we crash out of EU and have to pay tariffs for EU goods, then it’s an export duty charged by the EU countries at source. Do they keep the duty or pass it on to EU?

and then UK “ retaliates” by charging export tax on British goods exported to Europe?

but if we crash out we dont HAVE to charge export taxes do we, why would we? We write our own rules. Is it the case that EU countries are obliged to charge an import tax? Is that it?

so thinking about Trump’s trade war, I understand that more easily - US charges import duty and China responds in kind. Simple.

apols for being such a dork.