Because normally you wouldnt see a major city drop 20% while others climb 30-50% in the same time period. Same as the market conditions that saw the median price in perth overtake/match Sydney for a while. Australia has had a 2 speed economy operating in a few forms over the last 10 years and largely its kept our economic powerhouse ticking over as a nation.
A 20-25% drop across Sydney and Melbourne would have big impacts on the availability of credit across the nation unless offset by massive growth elsewhere but i dont see where that could come from.
