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Payment structure:
Even if the currency that’s using the payment structure died it still can be used by the other currency used to replace it.
2. Regulations:
Yes it’s onerous, yes it’s bloated but it’s still regulations that no one has to rewrite from scratch.
3. Autopsies:
It gave the planet earth one valuable lesson: monetary Union without fiscal Union is a suicide even if you get access to federal reserve swap line.
4. Integration:
Dual nationality children, friendship that extend from Helsinki to Lisbon, erasmus generation etc, those things will last a generation.