The purpose of this paper is to extend the existing literature on cross‐country disparities by providing measures of cross‐country inequality in human development index (HDI) and real income per capita over the 30‐year period 1975‐2004.
A well‐recommended inequality index is applied to the data.
Ten points are noted: first, HDI inequality declined over the period; second, the pace of decline slowed somewhat since 1990; third, magnitude of HDI inequality has been quite small; fourth, inequality in gross domestic product per capita also shows a declining pattern over the period; fifth, there is very high correlation between HDI and per capita income; sixth, despite the high correlation, magnitudes of inequalities in the two variables are dramatically different; seventh, therefore, even very high correlation may not be interpreted as implying similar inequalities in the variables; eighth, cross‐country inequalities in various regions show huge differences; ninth, negative trend in inequalities over the period shows high statistical significance; and tenth, t‐tests for equality of means do not pick up well even huge differences in regional inequalities, suggesting need for considerable caution in the use of such tests.
The primary scientific significance of the work lies in providing the measures of cross‐country inequality in HDI over the 30‐year period; showing dramatically different inequalities in HDI and income despite very high correlation between the two variables; and indicating cross‐country inequalities in eight different regional groups and also across regions.
