You can't just state that and it be true.

> It's understandable that people think like this in a place like SF where landlords have grabbed up a lot of salary increases, but it really doesn't work that way.

Yet, it does work that way. In every city I have ever lived in, it's worked that way. For rent in particular, any excuse that more can be paid leads to higher rent prices. A company built a new office nearby? Rent goes up. More "affluent" people are moving into a particular area? Rent goes up. And so on.

> If it was true, rents would keep climbing to 90+% of incomes but they don't.

Why? That's not the implication. Rent increases are done in a cleverly predatory way. Often times, rent is increased in small to medium steps but frequently, and the notice of such rent increases is notified in the minimum (if that) time legally required. That often leaves renters stuck because there are other, big surprise, expensive barriers to moving. Rent is a predatory system that maximizes the amount of rent that can be collected. That doesn't mean it goes to 90% of incomes as you claim, which nobody else is claiming.

My overall point is not about just rent. By providing UBI and not putting other protections and improvements in place, a capitalistic society will not just sit around and leave meat on the bones. Things will simply shift and people will still be in poverty. A poor educational system will still be there. Creditors will still be around. Etc.