There has been a lot of talk in the media about an Auckland housing bubble and its impact on the New Zealand economy. Below is a very informative graph I got from http://www.housepricecrash.co.uk which looks at the anatomy of a bubble.
When house prices are increasing rapidly we tend to feel better off but also have increased mortgage debt. House price inflation is a zero-sum game in that society as a whole does not benefit from a rise in house prices as those on the property ladder can only gain at the expense of prospective homeowners that cannot afford to enter the market. Over a short period of time house price inflation can provide a boost to economic growth if they deceive people into believing they are wealthier.
However, when a business invests it tends to have a positive-sum game in that if it employs 50 more workers that doesn’t mean that there are 50 other workers in the economy that are going to lose their jobs. This is real GDP growth rather than investing in property which tends not to generate growth as it is a finished asset – however some will argue that maintenance will always be needed.