"The first channel is through lower residential investment. Housing starts fell by 24% in the first quarter when set against the same period in 2007 and things have got worse since then. Kate Barker, a member of the Bank of England’s monetary-policy committee, recently said that the probable decline this year would be on a much bigger scale than in the slump of the early 1990s. The likely fall in investment could slice over a percentage point off GDP growth in both 2008 and 2009, according to Ben Broadbent, an economist at Goldman Sachs, an investment bank.
A second way in which the housing slump will hurt the economy is by slashing the demand for consumer goods linked to property transactions. When people move they typically borrow some extra money to pay for equipment to kit out their new home. That source of demand will take a big knock, since the turnover of homes may fall by 30-40% this year. The effect, estimates Mr Miles, could reduce GDP growth by a further 0.2-0.3%.
The third route is through the decline in property wealth, and this is a matter of considerable controversy. For many years it was taken for granted that there was a strong relationship between house prices and consumer spending (see chart). More recently the Bank of England has cast doubt on the link. "
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