A health 'Kuznets' curve'? Cross-section and longitudinal evidence on concentration indices

The distribution of income related health inequalities appears to exhibit changing patterns when both developing countries and developed countries are examined. This paper tests for the existence of a health Kuznets' curve, that is an inverse U-shape pattern between economic developments measured by GDP per capita) and income-related health inequalities (as measured by concentration indices). We draw upon both cross section (the World Health Survey) and a long longitudinal (the European Community Household Panel survey) dataset. Our results suggest evidence of a health Kuznets' curve on per capita income. Our findings point towards the existence of a polynomial association where inequalities decline when GDP per capita reaches a magnitude ranging between $26,000 and $38,700.That is, income-related health inequalities rise with GDP per capita, but tail off once a threshold level of economic development has been attained.