Melbourne specifically is cooked by the rate of growth, and declining tax revenue per capita.

When we funded the majority of the big infrastructure pushes our rate of growth was lower, and gdppc (and revenue/PC) was exploding. This generally ended with the start of big multicultural Australia policy in the late 60's.

So in comparison, the amount of infrastructure we need to build is greater per capita, as it has to try to cover the future population predictions, it needs to be done over less years as well.

Then we can get into the migration policy that's causing a decline in gdppc.