@MRJ and Chlidonias: Thank you very much for your replies. Very interesting. But still confusing as well. I did a little research in the same time and figured out, that according to this source:
Durchschnittliches Einkommen weltweit Australia is still behind Switzerland ref. average income (Switzerland 5898 Euros per month, 4th place worldwide, versus Australia 3753 Euros, 14th place). However, theese datas are from 2018, so maybe you (
@MRJ) may have some that are more accurate.
On the other hand, wikipedia
Liste der Länder nach Vermögen pro Kopf – Wikipedia also says that Switzerland is still No 1 regarding average wealth/capital in the world. And this are datas for 2019.
Sorry for being a little off-topic. If a moderator would like to place this conversation in a better fitting thread - just go ahead.