What is the justification for the minimum values for other indicators?
Generally, the minimum values are set to the values that a society needs to survive over time. For both education indicators, the minimum is set to 0 since societies can subsist without formal education. For income, it is set at $163 per capita GNI, which is the lowest value attained by any country in recent history (Zimbabwe in 2008) and corresponds to less than 45 cents a day (just over a third of the World Bank’s $1.25 a day poverty line). The minimum values are essentially fixed. Should any country’s per capita GNI fall below $163, the minimum will be changed accordingly.
