First of all, inequality between rich and poor countries has increased dramatically in the last two decades, with (as James Wolfensohn of the World Bank said) 20% of the world's population controlling 80% of the world's wealth.

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This was when population policies stopped being about controlling population and slowing population and started being about empowering women.

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Last year some officials praised Shunyi, a semirural suburb popular among expatriates, for controlling population growth.

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After controlling for population and the number of police officers in each county, the study found that a one percent point increase in the local unemployment rate leads to a 6.4 percentage point increase in the number of traffic tickets.

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It appears to be very stable and controlling its revenues in what had been a hugely growing population in southern California.

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