The answer to whether economic opportunities cause society to diverge into “the rich” and “the poor” or to converge into a “strong middle class” remains unanswered, because only a slight negative trend is visible. If there is any effect of economic freedom on the distribution of income in a society, measurable by the GINI coefficient, then it is weak, and easily countered by various other effects.

What: GINI coefficient – the larger it is, the more equally is the income distributed, everyone having the same amount at 100, the smaller it is the more income is concentrated in hands of the few, only one person having all the wealth at 0. And Economic Freedom Index.
When: The date of GINI is different for each country, the modal year being 2015. Economic Freedom Index is of 2017.
Where: 138 countries of the world
Source: WB for GINI and The Heritage Foundation for Economic Freedom Index.