Do the rich countries of the EU have the same appetite?
As a matter of fact, Germany and the other EU countries do massively finance the poorer EU countries (per https://en.wikipedia.org/wiki/European_Union_statistics#EU_b...).
Problem is corruption: EU funds too often get shunted sideways (e.g. for Hungary, https://www.theguardian.com/world/2018/feb/12/how-hungarian-...).
https://en.wikipedia.org/wiki/Federal_taxation_and_spending_...
The EU budget is 1% of GDP while the US federal budget is 20% GDP, 60% of which goes on social security / medicare / safety net programs. US federal spending acts as a huge inter-regional stabilizer.
Regional transfers must significantly increase within the Eurozone if the Euro is to avoid breaking up or immiserating huge numbers of citizens.
https://www.npr.org/2011/01/25/133112932/paul-krugman-the-ec...
I replied to a comment here, not to Krugman. This should be obvious?