Affordable housing is high density housing, while the majority of Australian cities are suburbs with low density, mostly detached single houses, often with a ga

Affordable housing is high density housing, while the majority of Australian cities are suburbs with low density, mostly detached single houses, often with a garden. For any given 'feature' in a suburb (shopping centre etc.) the houses in walking distance will have a higher value. If you have several multi-family homes or even towers you have a large supply of walking-distance-dwellings. If you have a bunch of single-family houses (the common thing in Australia) then you have low supply. In other words, Australia tries to huddle together as least as possible which causes many weird anomalies (don't get me started on quality of life/walkable suburbs/rise of US-style drive-everywhere-life with increased obesity/etc)