According to Wikipedia ...
"The Gini coefficient is a measure of statistical dispersion developed by the Italian statistician and sociologist Corrado Gini and published in his 1912 paper 'Variability and Mutability'.
The Gini coefficient is a measure of the inequality of a distribution, a value of 0 expressing total equality and a value of 1 maximal inequality. It has found application in the study of inequalities in disciplines as diverse as sociology, economics, health science, ecology, chemistry, engineering and agriculture.
It is commonly used as a measure of inequality of income or wealth Worldwide, Gini coefficients for income range from approximately 0.23 (Sweden) to 0.70 (Namibia) although not every country has been assessed."
Let me propose a new economic theory:
When country A abandons good paying manufacturing jobs in favor of low paying service jobs, and opens its borders to the lowest bidder for manufacturing work,
And country B (in spite of PR spin about the emergence of a middle class) empowers its corrupt wealthy elite to use its populace as poverty wage production fodder for export to Country A,
The income gap between rich and poor widens in both countries ...
...until the difference between communism and capitalism disappears all together.
I offer the following proof of my theory from the chart on the Wikipedia page: