[shoo]

I assume the meeting of the "number" stated here is an estimate of how much wealth would need to be invested in a stock portfolio to yield 1500/month net of taxes and inflation, without needing to trade time/labour for income.

Pretty reasonable, but without knowing more about OP's situation, advising someone asking how they can earn more income on the side to earn it by having $1m wealth invested in the share market may not be the most immediately actionable advice! A bit catch 22 if the current problem is "not enough surplus income".

[j_autumn]

I‘m from the EU and don’t earn a lot of money, so no wealth here which I could invest.

But I would love to be able to earn enough to live (simple, I don’t need a luxury life) while saving the rest to become financial independent at some point.