[knubie]

Accrding to the wikipedia article you referenced, the OECD data is already adjusted for purchasing power parity (PPP), which is a cost of living adjustment. [0]

[0] https://en.wikipedia.org/wiki/Disposable_household_and_per_c...

[insane_dreamer]

good point, I missed that; that does take into account COL differences then, though not healthcare and education expenses