Political fragmentation is testing Europe. The protest parties are galvanised by Brexit and demanding a similar vote elsewhere. While they poll strongly, whether they have enough support remains to be seen. Politics introduces a downside skew to growth.
How do you quantify the value of cultural integration? It seems rather anachronistic, but young people in the UK seem to appreciate far better than their elders the value of this – which is why they are overwhelmingly in favour of “Remain”