I ignore that "fact", because that "fact" is not true. The world's inequality is not rapidly increasing; it is decreasing. 

See the two charts, animated over time, that Hans Rosling shows in this video. The first shows rising health and wealth for all countries, and the second shows declining inequality in global income:  https://youtu.be/FACK2knC08E?t=44m24s (The whole presentation is educational.)

Also see: https://mobile.nytimes.com/2014/07/20/upshot/income-inequality-is-not-rising-globally-its-falling-.html