Banning foreign investors from buying residential property is a good idea, under some conditions, such as:
* The country is one of the favourite destinations with a very small population. (Even 0.01% of the Chinese population can shake up the NZ market. In that sense, even Canada is vulnerable too.)
* The country is one of the favourite destinations with a very small inhabitable area.
* The country is one of the favourite destinations with a very high population density.