[Nonstatist]

The only first world economies listed are Canada, England, maybe Spain (?) , and their economies are on the order of 15 % the size of us and less (and they are just barely higher).

For a "mature" economy with our size , none are more productive

[Racehorse]

The only first world economies listed are Canada, England, maybe Spain (?) , and their economies are on the order of 15 % the size of us and less (and they are just barely higher).

For a "mature" economy with our size , none are more productive

I can't decide whether you're quibbling or tossing out the test question.  :-)

Interesting discussion, though.  I just wish we had some better defined frame of reference.

[jb6]

Australia, Taiwan and S.Korea are not first world economies? Boy they'll be surprised.