https://www.reddit.com/r/MapPorn/comments/6v3fma/three_germa...
also recent:
https://www.vox.com/policy-and-politics/2017/8/18/16162234/r...
Today, Massachusetts’s GDP per capita is about double what you find in Mississippi — roughly equivalent to the gap between Switzerland and Slovakia — and it’s not getting any narrower.
Southern Germany, Western Austria, Northern Italy, Switzerland and parts of France: There's a big wealth cluster in the larger region around the Alps. Why? I don't know, but as a South German myself, I'm not too convinced by the claims of the article.
Now the industries of Northrine-Westfalia have been in decline for some time, so that's been dragging everything down. And Berlin lost a lot of its aid and most of the East is also somewhat northern.