Felix Salmon responds to Bill Easterly. Salmon thinks that inequality "increasingly [ignores] national borders":

Once upon a time, national borders were useful boundaries to use when measuring per-capita income across the planet. And given that statistical agencies are still national, that’s not going to change any time soon. But those numbers are going to be less and less informative as pockets of wealth spring up in poor countries, and pockets of poverty persist in middle-income nations.

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