I think the bar 'economy deteriorated' is a high one. The issue rather is failure of migrants to integrate (probably fault of both host nation & migrants themse

I think the bar 'economy deteriorated' is a high one. The issue rather is failure of migrants to integrate (probably fault of both host nation & migrants themselves) - thus creating ghettos / high crime rate / risk of terrorism. This is what seems to be happening - for example in France (banlieues, 70% of prison population is muslim, Charlie Hebbo).