Wealth distribution in New Zealand – 2018

The Department of Statistics recently published wealth distribution figures for New Zealand. According to Stats NZ, the median household net worth in the year ended 30 June 2018 was $340,000, up from $289,000 in 2015. The increase was mainly driven by an increase in property values over the last three years.

% of net wealth held by % of Households – 2018

According to the survey, the top ten percent of households hold 53 percent of total wealth in New Zealand, which is unchanged from 2015. The top one percent of households hold 16 percent of total wealth in New Zealand, which is down slightly from 2015. New Zealand’s Gini Coefficient is approximately 0.33.

The Lorenz Curve
The Gini Coefficient is derived from the same information used to create a Lorenz Curve. The co-efficient indicates the gap between two percentages: the percentage of population, and the percentage of income received by each percentage of the population. In order to calculate this you divide the area between the Lorenz Curve and the 45° line by the total area below the 45° line eg.
Area between the Lorenz Curve and the 45° line  ÷  Total area below the 45° line.

The resulting number ranges between:
0 = perfect equality where say, 1% of the population = 1% of income, and
1 = maximum inequality where all the income of the economy is acquired by a single recipient.
* The straight line (45° line) shows absolute equality of income. That is, 10% of the households earn 10% of income, 50% of households earn 50% of income.

In 2010 China’s Gini coefficient was 0.61 which was one of the world’s most unequal countries however officially it has been falling for seven years from 0.49 in 2008 to 0.46 in 2015. Rural incomes have grown more quickly that their urban counterparts – in 2009 the average urban income was 3.3 times that of a rural worker but now it is 2.7 times. Many of those living in rural areas actually work in cities but are prevented from living there because of the strict residency system. Also companies have now been looking to the rural areas for cheap labour.
But at the top end you would get the impression that inequality of wealth is extremely high – wealth = what you own, as opposed to what you earn. China has more dollar billionaires (596) than the USA (537). Research has shown that 1% of the population control a 1/3 of China’s assets.

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