Do you think there should be a regional currency system?

Going to 3 different countries with 3 different currencies, is a logistical nightmare. Ideally a universal currency would be best, but it's not practical, so I think the next best option is regional currencies, something like the Eurozone. Especially countries that travelers often group together. Like all of East Asia should have one currency. All of SE Asia. All of the Levant and Egypt. All of the Persian Gulf States. All the Caucasus and Maghreb countries. Southern Africa. East Africa. The eastern Caribbean. etc, etc...

Do you guys like this idea?

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Do you think there should be a regional currency system?
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