If Sweeden became a US state
mises.org
mises.org
(Actually part of German healthcare is state-run. I think perhaps half of the big hospitals in town are publicly owned; some by the city, some by the state.)
The major factor behind that was child care: Hiring a full-time nanny for your children is awfully expensive in Oslo, therefore being a businessman is awfully expensive.
Now, Oslo is expensive. No question. But noone needs a full-time nanny there, even if they might in Mumbai.
Perhaps the mental association is unfair. Perhaps the OECD data it's based on includes a comprehensive model of such things. Sweden and Germany have efficient health, childcare and education funding, the US does worse, all of that could be factored into such a comparison and perhaps they are factored into this one.
All this analysis tells me is that america is suffering from the same sort of inflation that Spain suffered when it stopped becoming the economical power house and Britain suffered during the 20th Century. What happens is money that was issued as dollar debt to foreigners creeps back into the economy that taxes in american dollar.
https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(PPP)...
This list should tell you everything - The difference in purchasing power between a Swed and american is just 6,000 dollars.
This is not even accounting for how expensive healthcare /education is in america - since america does a shitty job training its doctors compared to European nations - and even cuba.
Of the three lists on the page you linked, the smallest different is $8151, not $6k.
You're right that the article doesn't account for purchasing power - they only do it for US states. Of course, that doesn't help your case since Sweden is a more expensive place to live than most of the US.
I won't touch your point about the Spanish Empire because I assure you that I don't understand whatever it is you're trying to say well enough to discuss it.