"The bank's governor, Glenn Stevens, had earlier given the RBA's estimate of Australia's dwelling price-to-income ratio, which found that dwelling prices in capital cities were typically 4.8 times disposable household incomes - about half the ratio put by the doomsaying international survey Demographia."
So on an average australian wage of $67 000 equates to an average capital city price at 4.8 times of $321 600.