Essentially, the price of debt-sharing through deeper economic union is loss of national economic sovereignty.

BBC: Germany v France: The eurozone's next big battle?

That kind of rivalry, within a union of national systems sharing a common currency, would indeed stand as something both promising and distinctively European.

ECONOMIST: What is Europe?

But that would be less of a setback for Germany than before, because in principle there should be less need for burden-sharing in a more viable monetary union.

ECONOMIST: Breaking up the euro area: The Merkel memorandum | The

Again, it's very important to see risk-sharing, backstopping of the banking system to greater fiscal union.

WHITEHOUSE: Press Briefing

The UK is pressing for a series of solutions, including a larger bailout fund, euro bonds and structural reform within the European Union - which could lead to greater fiscal burden-sharing between the poorest and wealthiest countries.

BBC: UK Politics

But given the backlash that closures cause there, their first factory-sharing may come elsewhere: just before the Paris show a French union official let slip that the two firms were looking at building cars together in Brazil.

ECONOMIST: Carmaking alliances

The paper asserts that Scotland cannot have all the extra autonomy over taxes and spending and regulation that comes with independence, while somehow also hanging on to all the benefits of sharing a currency with the rest of the UK, because currency union after independence would have to work differently than it does now.

BBC: Scotland: Treasury wants a pound for a pound