Glenn Firebaugh argues that the Human Development Report estimates of changes in world inequality are misleading because they do not use a proper measure of world income inequality. For Firebaugh, a proper measure is a Purchasing Power Parity PPP) measure.

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Glenn Firebaugh criticizes the Human Development Report's estimates of world inequality for not using Purchasing Power Parity (PPP) measures, which he argues provide a more accurate representation of world income inequality by accounting for differences in cost of living across countries.

Glenn Firebaugh Argues That the Human Development Report Estimates of Changes