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The Euro has a single monetary policy. The benefit is less trade friction. The draw back is that monetary policy may not fit well with the general economy. This is what Greece experienced, the loss of currency control made other European businesses a lot more competitive.

I am pro EU but anti-Euro, it's not just sentimentality. If you are not aware, you should read about the Eurozone debt crisis of 2009. The Euro ties the economies of 19 companies that demonstrably should not all be joined. Germany and Greece having the same central bank just doesn't make sense, and it should not have happened.

As per my reply elsewhere:

And yet in the last few weeks the UK government managed to cause a run on sterling. If they were using the Euro then that wouldn't have happened / limited effect and Mrs Truss could potentially have implemented her tax changes. Not that I support that, just pointing out there are also downsides to a sovereign monetary policy. I personally think that being in the bigger club, the EU trade zone and Euro, would be better for Britain.

Greece is a cautionary tale, but not necessarily a currency one. Yes, they had limited options after everything blew up, but they were heading in that direction because they kept taking loans and the loans kept being given. If they had been able to devalue their currency its not actually clear that would have solved the problem - doing so also requires tight fiscal policy. Iceland did it, with a tight fiscal policy.

I’m not saying the view is correct or not, I’m just saying that I believe it to be the case in general.

It’s a source of part of the national identity.

And, even if right now I’m not correct and most people don’t care, if this became the condition for joining then anyone who opposes the EU would make this a division issue, highlighting that it’s part of the national identity, oldest currency still in use, how can we sacrifice that etc etc.

Then suddenly people would care.

Because sovereign monetary policy is a much-underappreciated but absolutely key element of sovereignty. Joining a monetary union and ceding independent control of monetary policy is extremely risky, especially when that monetary union is not accompanied by large scale intra-union fiscal transfers (i.e. on maybe 10x the magnitude existing in the EU or Eurozone).

What happened to Greece is a cautionary tale, and Britons would be wise to reject joining the Euro absent major political and fiscal reforms.

And yet in the last few weeks the UK government managed to cause a run on sterling. If they were using the Euro then that wouldn't have happened / limited effect and Mrs Truss could potentially have implemented her tax changes. Not that I support that, just pointing out there are also downsides to a sovereign monetary policy. I personally think that being in the bigger club, the EU trade zone and Euro, would be better for Britain.

Greece is a cautionary tale, but not necessarily a currency one. Yes, they had limited options after everything blew up, but they were heading in that direction because they kept taking loans and the loans kept being given. If they had been able to devalue their currency its not actually clear that would have solved the problem - doing so also requires tight fiscal policy. Iceland did it, with a tight fiscal policy.