According to a housing report, there are ten most expensive housing markets globally. The markets are categorised into five affordability brackets based on their median multiple. Affordable (3.0 and under), Moderately Unaffordable (3.1 to 4.0), Seriously Unaffordable (4.1 to 5.0), Severely Unaffordable (5.1 to 8.9), Impossibly Unaffordable (9.0 and over).