Can anyone explain what this graph actually shows? Specifically looking at the upper-right 2008 datapoint, if Log(NHE/cap) is 9, then the per capita national h

Can anyone explain what this graph actually shows? Specifically looking at the upper-right 2008 datapoint, if Log(NHE/cap) is 9, then the per capita national health expenditure is 1 billion? That makes no sense. (The original article is behind a paywall, so I can't check it.) It also seems highly relevant if other countries fall on the same line on the graph or not. If other countries confirm the conclusion then it would be much more solid, but if other countries have entirely different curves, then it seems much more arbitrary that the US falls on the shown curve. Finally, note that a tiny wiggle on this graph turns into a huge saving of health care expenses. For instance, the difference between 9.0 and 9.1 on a Log scale is 25%. I think this invalidates the claim that health care costs can't be controlled, even if you accept the assumption that the future will continue to follow the graph.