Income Inequality Dimension 

2014-2017 Gini coefficient 0= complete equality; 1 = complete inequality

OECD Definition and measure

Income inequality among individuals is measured here by five indicators. The Gini coefficient is based on the comparison of cumulative proportions of the population against cumulative proportions of income they receive, and it ranges between 0 in the case of perfect equality and 1 in the case of perfect inequality.

People in households with low incomes may have more difficulty meeting their material and non-material needs and experience economic hardship. Having insufficient economic resources limits people’s ability to participate in and belong to their community and wider society, which restricts their quality of life.

Income consists of

  • earnings, self-employment and capital income and public cash transfers;
  • income taxes
  • social security contributions

Poverty Gap


OECD Definition and measure

  • The poverty gap is the ratio by which the mean income of the poor falls below the poverty line.
  • The poverty line is defined as half the median household income of the total population.
  • The poverty gap helps refine the poverty rate by providing an indication of the poverty level in a country.
  • This indicator is measured for the total population, as well as for people aged 18-65 years and people over 65.

2014 StatsNZ - Income inequality has widened

  • Between 1988 and 2015, income inequality between households with high incomes and those with low incomes widened

    • In 2015, the disposable income of a high-income household was over two-and-a-half times larger than that of a low-income household.
    • Between 1988 and 2015, the income inequality ratio increased from 2.24 to 2.61.

2014 - StatsNZ the number of households on low incomes as increased

Since 1988, the proportion of the population in households with low incomes has increased

  • In 2015, the proportion of the population with household disposable incomes below 60 & 50% of median income was 18% and 10%, respectively.
  • The proportion of the population with low household disposable incomes increased steadily from 1998 to a peak in 2004