"""Massey - historically households had 1 wage earner - now they...

"""Massey - historically households had 1 wage earner - now they have 2. Times have changed, and we are never going back to the old days.
3.6 x 2 = 7.2...."""

You are getting warmer .... Care to venture why rents have not kept up with that ratio?

With unemployment going up and wages growth coming down, what will the impact be with zero household wage earners - 3.6 x 0 = Doh!!

Do your own risk assessment, but don't ignore whats happening all around you just to vindicate your position.