This is from a study made by McKinsey for e-G8 this year. I can't seem to be able to reach the direct link so here's the Google cache:
http://webcache.googleusercontent.com/search?q=cache:http://...
And their PDF:
http://www.eg8forum.com/fr/documents/actualites/McKinsey_and...
There may be survivor bias (Is that what it's called?) involved in that figure. Not enough details in the report that I could see.
Impressive reference hunting though
This is from a study made by McKinsey for e-G8 this year. I can't seem to be able to reach the direct link so here's the Google cache:
http://webcache.googleusercontent.com/search?q=cache:http://...
And their PDF:
http://www.eg8forum.com/fr/documents/actualites/McKinsey_and...