Paul Kelleher caught some flack for a blog post last week in which he approvingly cited a 2003 study by Angus Deaton and Darren Lubotsky (DL) that supposedly refutes the idea that income inequality causes poor health. I was curious. Paul sent me the original paper, a 2009 published critique by Ash and Robinson (AR), a reply by DL, and a longer article by Deaton.
Even though the original DL paper is getting old, and the field has progressed substantially since 2003, there is still an important take home message from this debate. Stated simply: income inequality may be one cause of poor health, but income inequality is also likely to be a mediator of other upstream causes of mortality.
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Utopia, you are standing in it! 
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