Is inequality going up or down?

November 2, 2017

     By Duncan Green     

My Oxfam colleague and regular FP2P contributor Max Lawson sends out a weekly summary of his reading on inequality (he leads Oxfam’s advocacy work on it). They’re great, and Max has opened his mailing list up to the anyone who’s interested – just email, with ‘subscribe’ in the subject line.

Here’s his latest effort – a long, but excellent overview on the latest debates and data on inequality.

‘You would think a question like ‘Is inequality going up or down?’  would be relatively easy to answer, but sadly it is not.  At Oxfam we have identified the growing gap between rich and poor and the impact of high inequality as a serious crisis. But how serious is it really?

The poverty and inequality of data on inequality
The first thing to say is that the data is not good, but that we do know that the problem is strongly biased in one direction – inequality is systematically underestimated.  We also know the data for developing countries is much worse than that for rich nations. The main method used is to calculate a country’s Gini coefficient (a number between 0 and 1, where 1 is perfect inequality and 0 is perfect equality).  The Gini has been criticised, and other measures like the Palma which look at ratio between the top 10% and the bottom 40% are favoured by many.  Nevertheless, it remains the most widely accepted measure.

The Gini is calculated using household surveys or census data.  This data has been shown to systematically underestimate the incomes of the richest part of society. For example, a study of several Latin American countries found that the richest survey respondent had a salary lower than that of a manager in a typical medium-to-large scale firm.  The super-rich do not fill out surveys, and when they do they rarely reveal the true scale of their income.

Various methods are being pioneered to recalculate top incomes, to complement the surveys, most famously the and a group of economists behind the World Incomes Database.   Another way is supplementing national accounts data for survey data.  These methods, whilst themselves far from perfect, demonstrate in every country that inequality is worse than previously thought.  They also have an impact on trends.  Using top incomes, Brazil has not reduced inequality whereas it has if we look at the Gini.

Global Income Inequality Going Down
The thing that is measured most commonly is income inequality, the gap in the incomes between the richest and the poorest.
The good news is that global income inequality is very likely to be falling.  If everyone on earth were the citizen of one country, then the gap between the richest and the poorest has reduced. Christoph Lakner and Branko Milanovic have pioneered work in this area, and Branko recently wrote an excellent blog on this.  The fall in inequality is the result of growing incomes in the developing world, and particularly in China. It remains extremely high, however.  If the world were a country, it would have inequality levels around about the same as South Africa, one of the most unequal countries in the world.

Within-country  income inequality
Arguably what matters to moxst people though is the income gap between rich and poor in their own country.  So what has been happening here?

Using the best data available, the IMF in their excellent Fiscal Monitor released recently, try to look at how income inequality has increased or decreased in as many countries as possible – 94.  They conclude that inequality has increased in the majority of the 94 countries they were able to look at over the last thirty years, but only just – 53% of them.

The regional variation is interesting. In Latin America, it rose fast for the first twenty years, and then fell in many countries for the last ten, as governments took strong steps to reduce inequality.  In Asia it is the reverse, with equitable growth nearer the start of this period changing into a big increase in inequality in recent years.  In most (but not all) rich countries inequality has risen quite sharply, although at different times during those thirty years. In sub-Saharan Africa, the picture is mixed.  For the Middle East and North Africa, the data is simply not available.
The countries that have seen rises in inequality include China and India, and some of the other countries with the biggest populations.  This means that seven out of ten human beings live in a country where inequality has risen in the last thirty years.  China’s inequality has reduced slightly in recent years, but remains almost twice as high as it was thirty years ago.

The IMF conclusions, which are similar to the World Bank’s last year, are important.  They reflect a lot of what we know already about the great efforts made in Latin America to reduce inequality, through more progressive taxation and more progressive spending.  These efforts are now being threatened by a wave of new right-wing governments that are opposed to such action.

They also show that the picture is mixed in other parts of the world too, and this is also reflected in Oxfam’s Commitment to Reducing Inequality index, which highlights those countries in other regions, like Namibia, that have made significant efforts to reduce inequality.

These good news stories are important, as we need to learn from them and use them to pressure the many governments that are doing the wrong thing.

Taxing and spending is not the full story though. Other countries like Cambodia have seen significant decreases in inequality because of the pro-poor nature of their growth, rather than any significant active intervention by government using tax or spending.  This shows the crucial importance of growth that creates good jobs for those at the bottom of society.

It also shows the paucity of data.  In the IMF work, comparisons are only possible for 94 countries. Less than half of sub-Saharan African countries are covered, and only 11 countries in Asia and the Pacific.

Consumption versus income
There is another crucial distinction in how income Gini coefficients are measured.  In Latin America and rich countries, they are based on income; in Africa and Asia on consumption (as a proxy for income).  Consumption Gini coefficients are generally much lower, so comparing Africa and Asia with Latin America is to confuse apples with oranges.  This is important, but rarely noticed.  India for example has a consumption Gini (the official one) which is similar to Ireland’s. Its income Gini is much higher, similar to Brazil’s.   Whilst this does not affect the observation of trends over time in individual countries or regions, it does make global comparisons rather specious.

Wealth inequality
The other major measure of the gap between rich and poor is wealth, rather than income.  Here the data is even worse.  But again, we know with some certainty that wealth inequality is systematically higher than income inequality.

Wealth inequality is very important because it is wealth that links most closely to political power and influence, not income.  Today’s income inequality also becomes tomorrow’s wealth inequality, as the value of wealth rises more rapidly than incomes.  This is compounded by inheritance.

The best data on global wealth trends is the work by Credit Suisse in their annual report. It is this data that we use to produce our eye-catching statistics ahead of Davos each year.  Data on the wealth of those at the bottom of society are not available for many countries to a decent standard, including most developing countries.

In terms of trends, it is clear from what we know that wealth inequality has risen considerably in recent decades in many countries.  The wealth in the hands of the top 10% in China is now similar to that observed in the US.   We also know that the wealth of the top 1% has increased, and is now higher than the whole of the bottom 99% of humanity.

Rich countries and developing countries
The basic level of inequality is significantly higher for almost all developing countries, than for rich countries.  This in turn is linked to the much greater levels of redistribution that rich countries engage in.  The IMF fiscal monitor points out that more than three quarters of the difference in income inequality between rich countries and Latin American countries is explained by the differences in the levels of taxation and spending.

We also know from other IMF work, that a Gini coefficient above 0.27 has been found to be harmful to growth.  Only 11 countries in the world have inequality lower than this, and a number of developing countries have inequality almost twice that level.

We also know that high levels of income and wealth inequality have been linked to a large range of negative social and political outcomes.  They also make it much harder to reduce poverty, as the majority of income growth is captured by those at the top.

Absolute inequality versus relative inequality
There is one final measure that deserves mention.  All these other measures are relative- they measure the percentage increase for different groups in the population.  So if I am poor and I get a 10% increase and the rich get a 10% increase, then relative inequality remains the same.

But if I am on ten dollars a day, and I get a ten percent increase, that is 1 dollar.  If I am on 1000 dollars a day, and I get a ten percent increase, that is 100 dollars, or one hundred times as much.  So absolute inequality increases.  This is arguably more important, in terms of people’s spending power, and in terms of how they perceive inequality, which is much more likely to be in absolute terms- they see how much more money they have to spend, and compare that to how much more the rich have.

Oxfam has shown previously that whilst the relative/ percentage income increase for those towards the bottom and middle of the global income distribution compared well over the last thirty years with the percentage increase of those at the top (represented in the famous ‘Elephant Graph’ where the back of the elephant is the growth in the incomes of the relatively poor in the last thirty years, and the trunk the growth in the incomes of the richest,) the absolute increases are almost entirely captured by the ‘trunk’, and the back of the elephant disappears.

So what can we conclude from all this?

1.        It is good thing that global income inequality has reduced, but it remains very high indeed.

2.        Global wealth inequality has increased. Wealth inequality levels are systematically higher than income inequality.

3.        The majority of countries have seen an increase in income inequality in the last three decades, with sharp increases in the most populated countries.

4.        A number of countries, especially in Latin America have seen a significant decrease and we need to learn from this.

5.        Levels of income and wealth inequality are far too high in almost every country, and especially in developing countries, threatening growth, poverty reduction and driving a range of negative social and political outcomes.

6.        Data on inequality is very poor, and systematically underestimates the incomes and wealth of the rich, and with this the scale of the problem.

7.        Absolute levels of inequality remain dramatic, with the vast majority of global income growth being captured by the top 10%, and the top 1% capturing more than the bottom 50%.’

November 2, 2017
Duncan Green