That's income inequality. Try looking into wealth inequality for the real picture. Governments, at least in europe, are quick on the trigger to tax income but never wealth. In Germany, that already leads to an insane level of wealth inequality, among the highest in europe, where tons of families have mini feudalistic empires quietly stashed away.
https://ourworldindata.org/uploads/2018/07/Top-Incomes-768x5...
https://ourworldindata.org/grapher/income-inequality-in-lati...
https://ourworldindata.org/income-inequality#global-income-i...