Hmmm.
You got me researching.
My first thought was certainly that you could be right, in whole or in part, and I should look for causes.
That being the case, I considered two of my favourite subjects on Australia, the much higher minimum wage, and the mandate of at least 4 weeks paid vacation per annum.
My thought being both that this drives up income (and median income) and therefore consumer spending, but also that it drives investments in productivity.
For the above, note that the Aussie minimum wage as at July 1st this year is $18.93 AUS which is $18.61 CAD per hour. Compare that with our recent hike to $14, which only Ontario and AB are at, approximately.
The difference, interestingly is 32%, prior to the recent increase, the Aussie minimum wage was 63% higher than Ontario's.
I think that lends some credence to my theory.
But that got me thinking.
Part of that GDP is driven by higher incomes and that in turn requires higher prices to finance those incomes, which means a dollar doesn't go as far in daily life.
So instead of comparing the GDP per capita 'raw', how about comparing it on a PPP (purchasing power parity) basis.
Thankfully someone did that math for me.
Based on the IMF calculation: Australia would be #18 in the world at $49,882 INT $ per capita, Canada would be #22, at $48,141 INT $ per capita..
This does leave Australia a tad ahead, but only by 3.6% not 25%
https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(PPP)_per_capita
The rest I think we can set aside.