Rosling does a great job in the book to drive this point home. He has a logarithmic scale centered on 2, 8, 16, and 64$ a day, and shows just how much of an imp

Rosling does a great job in the book to drive this point home. He has a logarithmic scale centered on 2, 8, 16, and 64$ a day, and shows just how much of an improvement in life it is to go from 2 to 8. It means a massive drop in child mortality, access to health care, small families, educated children, etc....