gdp per capita growth as well as sustainable financial situation so that German state can meet its social obligations without a fiscal crisis like in Greece

I live (now) in a country with a GDP per capita an order of magnitude less than the US.

Having just come come back from the US. I can say without doubt.

There is much less poverty here. The average citizens quality of life here is an order of magnitude better than the us.

Funnily enough. Money isn't everything. Stuff like personal freedoms. Social interaction. Inequity are much more important IMHO.

Which country ? If GDP per capita in your country is an order of magnitude less, I question your assertion

I don't think GDP/capita is enough, since it is taking an average of a highly skewed distribution. We really need something closer to a median: How about inflation-adjusted median income? Or perhaps inflation-adjusted median income after housing.