It’s not a bad measure but I don’t think it’s the best, I’m currently working my way through Spirit Level and so I think some measure like the Gini coefficient would be important.
I think that median income, Gini coefficient, poverty rate and something like the human development index would give a decent overall picture. I don’t think a single metric really does the job.
Yeah it’s a great visualisation, you would need to do it for each electorate in the house if reps. Maybe you could do one for the whole senate though.