By this measure, no market is more exposed than Sydney. At 12.9 times average earnings, its price-to-income ratio is the highest in the country, well ahead of Brisbane's 10.2 and Melbourne's 8.8.
Through the crises of 2008 and 2011, Sydney's ratio sat between 6 and 8 which was not too far ahead of other major cities. It wasn't yet a uniquely leveraged market, so it didn't behave like one. What the 2013–15 boom did was lift Sydney’s ratio from about 7 to 10 in just two years, and Sydney has stayed the most stretched since.
So, in a sense, yes, Sydney is falling furthest because it grew the most. It’s just that the last three years alone can’t explain it. Instead, it's a decade of accumulated growth that left Sydney the most leveraged market in the country.
This downturn also differs from the rest in that it comes paired with permanent policy changes that reprice investor demand for good.
So just as this downturn has hit Sydney harder than anywhere, its recovery is likely to look different too.
Part of it will come when the outlook on rates stabilises. But another, less predictable part will depend on how investors choose to show up in the years ahead.