How to stop housing booms

[ArtM72]

One could, like Norway has done, curtail mortgage lending by other means than raising interest rates. In the case of Norway, the central bank:

cut the loan-to-value ceiling on mortgages from 90pc to 85pc. It forced the banks to raise to capital buffers further. The Norges Bank has recommended a 1pc counter-cyclical buffer based on its view of what constitutes a safe level of credit growth. [The Telegraph]

These measures basically stopped Norway's house price boom in its tracks

Voilà, it isn't so hard..

I remember when I bought my house I needed 20% down.  Long time ago (1977)