This graph compares the average incomes from the richest to the poorest countries in the world and separates them into fifths (20% x 5). It also chooses a wine glass graphic to represent it.
These two choices (representing the world in fifths, and using a "wine glass" graph) I believe gives a skewed understanding of what the data actually represents.
I dug through the original data to find the same percentages in tenths so I could then make the above chart as a regular bar graph. The result is below:
It makes me think of the phrase: "If you give ten people ten cents each, eventually one person will have a dollar and the rest will have nothing".