The top 8 richest people of the world have net worth of the 50% of the population of the earth, That is about 3.5 Billion people.
As per Economist Ruchir Sharma who wrote the Book “Breakout Nations”. There are good billionaires and bad billionaires. He says the number of good billionaire should be always more that the number of bad billionaires.
Everybody is worrying about Economic inequality. Economist Jeremy Rifkin says marginal cost of production could come down to zero. This means most of the legacy business would become defunct and lead to more egalitarian society.