At least, according to this: 700 years of Western inequality, in one chart – Vox
The chart shows the percentage of wealth owned by the top 10% since 1300. There are only two times it takes a major drop: during the Black Death in the 14th century and during World War II in the 20th century.
If true, it means that wealth concentration will continue unless another major catastrophe occurs (pandemic? global warming?).
There is lots to debate in all this. The numbers themselves are debatable (i.e. just how accurate and representative are they?) As well, there is an argument to be made that it doesn’t matter how inequally distributed wealth is if generally life for the 90% is good. But the Vox piece argues that such inequality leads to political instability and other problem, and that a good life for the majority isn’t enough.
Read the piece and consider it for yourself.