@kingpins The OP mentioned 21% interest rate which was when the cash rate was the highest in 1990 (17.5 Cash Rash Rate)
Back in March 1990, the standard variable rate may have been 17-21 percent but the average mortgage was only $71,000. Against a backdrop of average weekly earnings of $523.60 for an average annual salary of $27,227, in 1990 mortgage payments made up 44.99 percent of income.