But in Nunavut, for example, alcoholism and suicide rates are higher than the national average, life expectancy is lower and almost half of the population lives in overcrowded housing.

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For example, in its fourth amended registration statement, filed with the SEC in October of 2011, Zynga noted that during the first half of last year it estimated the blended average paying player life for a game as 15 months, down from 19 months a year earlier.

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Those who left private schools in the 1980s and early 1990s can expect to earn 35% more in life than the average product of a state school, they found, around half of which can be attributed to education, not background.

ECONOMIST: Private education