Thanks for sharing, the Gapminder level stratification (and Dollar Street photos) was very eye-opening and a humbling reminder of how privileged I am as a software engineer.
A few years back, Bill Gates bought every university graduate who wanted one a digital copy of the book Factfulness. It's like the insight from that stratification, over and over, in book-length format. It's really quite excellent.
One of the interesting trends you'll see is we've gone from /the vast majority/ of the world at Level 1 really not all that long ago to around a billion people today (probably less when as I write this).
The world is getting a lot better very quickly for a lot of people. At the same time, solving the problem is no longer intractable.
I will also mention: "Privilege" is complex, and life isn't all about money. Starting around level 2 or 3, "stuff" usually isn't the biggest problem in life. You get used to the inconvenience of needing to boil running water or having to ride a bike instead of a car pretty quickly. You don't experience it as inconvenience at all if you've never had it (as most of humanity hasn't for most of time).
On the other hand, humans are social creatures. Many places where people live at level 2 or 3 have communities and families of a type you've never experienced if you grew up in the US. The US is a very lonely place, and there's a mental health crisis in the US that would be completely foreign in many places at level 2 or 3.
The US also experiences much greater financial stress. If you're in a poor village, but you grow your food and own your home, you stress out a lot less about money than if you're making a 6-figure income, but worried about college debt and making your mortgage if you have a short-term job loss, divorce, or medical crisis, as is common in the US.
