By 2035, there will be almost no poor countries left in the world. Almost all countries will be what we now call lower-middle income or richer.
If people want capital gains taxed more like the highest rate on income, that's a good discussion. Maybe that's the way to help close the deficit.
Nigeria has moved into low-middle-income, but their north is very poor, and the health care systems there have broken down.
In low-income countries, getting to a health post is hard. It's very expensive.
In low-income countries, the main problems you have is infectious diseases.
Don’t tax my income, tax my consumption.