[BirdieNZ]

(Usually) rents are already as high as they can be, in aggregate. In other words, the market cannot bear a higher cost for the good, so an increase in cost has to be eaten by the landlord.

This is actually very easy to see in countries with no 30 year mortgages, because landlords have to refix their mortgage rates every 1-5 years. This means you can see regular landlord cost changes as interest rates fluctuate, as well as the impact on rents.

The impact on rents is essentially 0 as landlord costs change; instead, rents follow tenant incomes, because landlords are able to charge more as long as tenant incomes increase.

I've got plenty of data from New Zealand if you're interested, but I'm sure it's the same everywhere there is supply-constrained housing.

[prepend]

> Usually) rents are already as high as they can be, in aggregate. In other words, the market cannot bear a higher cost for the good, so an increase in cost has to be eaten by the landlord.

How do you explain rising rents?

[BirdieNZ]

Rising tenant incomes. As incomes increase, landlords are able to increase rents proportionally. This is only true where demand outstrips supply, but that's the case in most developed cities in the West, as well as many other cities.

Tenants have several fixed costs to pay: taxes, food, rent, and transportation being the main ones. If their incomes go up, rent typically consumes the increase, because housing is a fairly uncompetitive market.