Healthcare spending varies across OECD countries. The average OECD country spends about 10% of its GDP on healthcare. However the US is an outlier and spends more than 17% of its GDP on healthcare.
The following chart shows healthcare spending per capita in OECD countries in US dollars. This chart does not show the figures as a percentage of GDP though.
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Chart Source: OECD
Source: The Healthcare (R)evolution by Niels Clemen Jensen, Absolute Return Partners LLP
According to Mr.Jensen, despite spending the highest on healthcare Americans have one of the lowest life expectancies in the OECD.