De facto, you have a multi-speed Europe. You look at the Schengen, you look at the euro zone, all this kind of cooperations, you have a multi-speed Europe.

If people do not believe in Europe and in the euro area, it must be dismantled.

You can suddenly have a series of countries waking up and saying, 'I want the same status as the Brits,' which will be, de facto, the dismantling of the rest of Europe.

As to the euro zone avant-garde, it must go towards more solidarity and integration: a common budget, a common borrowing capability, and fiscal convergence.

We have the eurozone. Could we accept to be cleared, regulated, and de facto have inflows and outflows from a country that has decided to leave the E.U.? For me, definitely not.

Europe's younger generation has only experienced austerity.