Going back to Sunder's original analogy..
I don't follow the logic in why it's bad for CG if rental yields go up??
Think I've had enough of the beef analogy. Let's talk straight.
The premise of the argument is that "all else being equal". Let's work this out from base principles:
Rent is rising. Why? Not in a slow controlled fashion in line with either CPI or wages, but outstripping both
Is it because supply has fallen? Have people exited property investment? Possibly
Is it because demand has risen? Have we had a population boom? Possibly.
So what can cause supply to drop. Did a whole lot of the market get declared unliveable? No. So houses still need to be there. Just ownership and use must have changed. The only other use for IP is either as a PPoR or sitting vacant. We're told we have record LOW vacancies, so it's not that. So if supply dropped, then investors must be dumping stock. If they're dumping stock, CG down.
So what can cause demand to rise? Did we suddenly have a lot of kids turn 18 and want to move out of home? Not that I can see. Did we have a immigration boom? Immigration growth, sure, but not a boom. Did we have a change in living arrangements? Over thirty years, yes, we've changed from something like 2.3 to 2.1 people per residence, but not enough for it to explain less than 12 months of rent spikes.
So seeing as there has been no massive change of fundamentals, the change in pricing has to do with preference between interchangeable goods. For example, if you could rent a property for $300pw, and mortgage payments are $400 a week, you might think "Why make the land lord rich, I'm buying". So the preference is to pay the premium for ownership.
But if repayments go from $400 a week to $700 a week, you might think you could do something better with the extra $400 a week you would save by renting. So you sell your PPoR and look for a rental property.
Unfortunately, everyone else thinks the same way, and there is increased demand for rentals, and so to get that place, you now need to offer $350... But someone else says... $350 vs $700? I'll still rent, Auctioneer! I bid $360! and so forth.
However, the pressure isn't one way. Some people have to sell their house. It's a fact of life - deceased estate, foreclosure, moving, upsizing, downsizing, etc. Just say I want to sell my house at $400,000. I know that anyone buying it at 9.25% interest will need to pay roughly $700 a week repayments. I know nobody wants to pay that much for a house, when renting costs half that at $360.
I can't affect interest rates, so the only variable I can change is my price. I'd love to hold out for a good price, but I can't. So I drop to $380k, it might sell, or it might not. But even if it does, it lowers the median for that area, and the next person to sell a similar house would look to see what I sold for.
The point is, rising rents is an indicator that the gap between renting and buying is too big. It'd be lovely to think that the gap only closes upwards one way - that is, rents have to rise and prices don't have to fall. But the market doesn't work like that. As long as there are people who HAVE to sell, they will pull down the price for everyone else.