Cinnamon patrol

I saw this article in the NZ Herald which references a new housing affordability study. The study covers NZ, Australia, Canada, Ireland, the UK and the US. It compares the median income with the median house price. Apparently a multiple of 3 (3 years median income = the median house price) is considered affordable.

Cities of interest, in order of least affordability, are:

#1 Orange County, California (multiple = 11.7)
#4 San Francisco, California (10.1)
#7 Sydney, Australia (8.5)
#9 London (GLA), UK (8.3)
#11 Perth, Australia (8.0)
#13 Vancouver, Canada (7.7)
#18 New York region (7.2)
#21= Auckland, New Zealand (6.9)
#21= London Exurbs (S & SE of England) (6.9)
#23= Melbourne, Australia (6.6)
#30 Brisbane, Australia (6.1)
#31= Christchurch, New Zealand (6.0)
#31= Belfast, Northern Ireland (6.0)
#37= Dublin, Ireland (5.7)
#47= Wellington, New Zealand (5.4)
#70 Chicago, Illinois (4.5)