Norway is flush with oil money. But it is not THAT expensive. Their prisons are about 6x more expensive compared to US prisons. If US would reduce their prison population to reasonable levels, you would have the same standard easily.
Norway:
> The cost of maintaining prisoners at Halden costs about $500 per inmate per night. ($500*365 = $185 000 per year)
> The average inmate in minimum-security federal prison costs $21,000 each year. The average inmate in maximum-security federal prisons costs $33,000 each year.
Norway:
> The cost of maintaining prisoners at Halden costs about $500 per inmate per night. ($500*365 = $185 000 per year)
http://theweek.com/article/index/228229/the-jail-where-every...
US:
> The average inmate in minimum-security federal prison costs $21,000 each year. The average inmate in maximum-security federal prisons costs $33,000 each year.
http://www.washingtonpost.com/blogs/wonkblog/wp/2013/08/13/w...