https://foreignpolicy.com/2012/02/27/were-all-the-1-percent/

There are so many factors no one in this subreddit is considering tbh. For example, its somewhat ironic because American wealth of most citizens is probably and comfortably in the 10% of the world, and at least 10% of Americans likely fit in the 1% of the world. This is a very American or western centric post and also comments. There's nothing wrong with that, except it's totally biased and makes most of the purpose of this discussion null.

Not to mention the fact that for most people in the world, the barrier to entry into wealth is actually authoritarian governments who limit or ban the market approach. Thus never giving any "common person" the opportunity to rise above the poverty line. A lot of countries also never get the opportunity to industrialize properly, and remain agricultural based economies which are understandably poorer than industrialized or service based economies.

Did you know that China's middle class represents more than 50%+ of the population? It's quite ironic again, that people are always shouting "class war" when the majority is the middle class, who represents an in between of rich and poor. In most western countries if not all, the middle class is 50%+. It's not hard to imagine considering that 3% of China grew to 50% in 2018, that this is a global movement, and the rest is likely to happen in other countries such as India and in Africa and Latin America more generally.

https://chinapower.csis.org/china-middle-class/

But you've forgot one element that is most important. Historical wealth. If you jot down a line of today's 8 billion people we would own more than 99% of global historical wealth. Yes today, all 8 billion people are in the historical 1% of history.