"Nearly always, so as to live at peace with ourselves, we disguise our own impotence and weakness as calculation and policy; it is our way of placating that half of our being which is in a sense a spectator of the other."

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Purchasing power parities are not a reasonable method for comparing households across countries or currencies. The reason for this is simply that PPPs are sensitive to the prices of all the commodities, goods and services, that households are consuming worldwide, with each commodity weighted in the calculations according to its share in international household consumption expenditure.

— Thomas Pogge