The top 10 least affordable with respect to median price/income ratios:
China Hong Kong 18.1
Australia Sydney, NSW, 12.2
Canada Vancouver, BC 11.8
N.Z. Auckland 10.0
U.S. San Jose, CA 9.6
Australia Melbourne, VIC 9.5
U.S. Honolulu, HI 9.4
U.S. Los Angeles, CA 9.3
U.S. San Francisco, CA 9.2
U.K. Bournemouth & Dorset 8.9
http://www.demographia.com/dhi.pdf
The top 10 least affordable with respect to median price/income ratios: