The 7 must-know numbers of the week

The amount by which economist Steve Keen thinks house prices will fall by the end of the year. "Overall, the likely outcome is a fall of 6% 10% in real terms over calendar year 2012," he says.

The year-on-year increase in the number of mortgages AFG brokers arranged in January 2012 compared with January 2011. The aggregator says the January result marked a return to more normal trading levels after January 2011 was affected by the Queensland floods and other natural disasters.

The number of capital city fringe suburbs with a median house price under $300,000, according to RP Data. Gagebrook, 16 kilometres from Hobart, leads the list with a median house price of $140,382.

The growth in NAB's mortgage book during 2011. It grew its mortgage book by $19 billion to $177 billion, comprising $126 billion in owner-occupier mortgages and $52 billion in investment loans. Second-tier lenders Bankwest, Bendigo & Adelaide Bank and Bank of Queensland also had double-digit growth.

The cost of swimmer Geoff Huegill's new Darlinghurst terrace. Huegill and his wife, Sara, own 60% of the terrace, which they bought in partnership with Geoff's in-laws.

The official cash rate, as the RBA decided on Tuesday to leave it unchanged. The move surprised many in the industry, with 24 of 27 economists polled by Bloomberg before the meeting tipping a rate cut. 

The year Kell & Rigby, one of Australia's oldest and most respected building companies, was founded. The company is set for voluntary administration.