Researchers who change country produce more influential work

I often wonder why Europe is doing better then America.

I take the example of my son as the type person who makes the decisions on the ease of doing things - and the resources available

He chose Germany to do his doctorate. It was easy to get into an university there. The country has a very good reputation and all the resources. He could pick a platform with a lot of respect attached.

and he has never lived in that country before.

America is very hard going

I would think that he represents an average academic