“…As mentioned earlier, the analysis of housing market bubbles is based both on the prices themselves (see, e.g., Kibunyi et al, 2017 ; Chen & Chiang, 2020 ; Coskun et al, 2020 ) but also on relational indicators, in particular the price-to-rent ratio (see, e.g., Mikhed & Zemcík, 2009 ; Yiu et al, 2013 ; Greenaway-McGrevy & Phillips, 2016 ; Zhang et al, 2017 ; Li et al, 2019 ; Clark & Lomax, 2020 ) or a price-to-income ratio (see, e.g., Fraser et al, 2008 ; Chen & Cheng, 2017 ; McMillan & Speight, 2010 ) in the absence of rental data. The use of the latter indicators is preferable because both housing prices and rents can exhibit explosive behaviour over the same period, making it difficult to conclude on the existence of a bubble when based solely on prices.…”