The U.S. residential housing market collapse illustrates the consequences of ignoring risk while funding mortgage borrowing. Collateral over-valuation was a foundational piece of the crisis. Over the past few decades, secondary markets, securitization, policy and psychology increased the flow of...

Using around one million repeat sales observations of single-family homes across New Zealand, over the period 1992 to 2021, we provide evidence that idiosyncratic risk in real house price appreciation varies considerably across houses. We find that idiosyncratic risk is time varying, depends...