Earlier quoted context omitted.
See Montenegro, the country that has no own currency, but uses Euro: they have no particular problems because of this.
Montenegro has a population of about 600K. Its annual GDP is $12 billion. There are also small countries that are pegged to the US dollar. When you are a small-potatoes nation-state, and have a non-diversified or small economy, it is a great idea to use a larger, better established, currency. * It's more stable * Trade is easier * More than 3 banks accept your currency! The incentives of the nations controlling the e…
There's a big difference between having a currency pegged to another, and not actually having a currency at all, and using physical foreign currency for everyday transactions.
Pegs can be broken and may be hedged with FX futures.
The second situation is a much stronger existential commitment, which makes it more reliable and predictable. Reinventing a new national currency is a high barrier, which cannot be hedged directly in the FX markets (although sovereign CDS might be close enough).