An interesting way to look at the data, given the flaws of PPP is pecentage of GDP. Obviously it is complicated by differing GDP between countries, but it might remove some of the problems of, for example, booming economies paying doctors more. Note that there is now less of a relationship with life expectancy, this is likely due to confounding with the size of the economy, but the US is still way ahead in terms of the size of its GDP being spent on healthcare, even given its larger economy.
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