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Hmmmm, I'm not familiar 🤔 what treaty is that?

the one that introduced the euro in preference to national currencies, amongst other things

I know nothing about any of that tbh. A standardized currency seems preferable to me. I can't imagine constantly having to deal with multiple currencies. But I know there are issues with standard ones as well, especially when countries tweak their financial reportings. Lol

Ah! I am old school!!! and remember days of yore, with Francs and Pesetas and Deutschmarks et al.

It sounds like a nightmare for travel 😂 but each to their own lol