I wouldn't have expressed it exactly as jaywalker did, and of course I had to look up 'autochtonous', but I do agree with the spirit of what he's saying (in my interpretation). This would be that isolationism is very economically damaging. I'd add my own two pennyworth, which is that globalisation is not new. The Celts traded, and indeed migrated, over great distances. Turning one's back on the rest of the world has never been a route to prosperity.