One concept that has gotten a lot of attention the last few months is the household balance sheet: the relationship between household assets and liabilities, and what that means for household behavior (consumption versus saving). Though not the precipitating factor in the current crisis, the weakening of household balance sheets (fewer assets, same liabilities, less net worth, more anxiety) has likely had a significant effect in depressing consumption, which has been the single largest factor in our recent decline in GDP.
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On the headline level, [from 2004 to 2007] median income fell from $47,500 to $47,300 (all figures are in constant 2007 dollars), while median net worth (assets minus liabilities) grew from $102,200 to $120,300. No surprise there: we already knew wages stagnated, while real estate and stocks appreciated. However, since the survey was conducted in 2007, median net worth fell by 17.8% according to the Fed estimate, to $99,300, and that’s just to October 2008. Given that the cumulative returns of the stock market have been about -15% since October 31, and that housing prices have fallen as well (and the Fed used a housing index that has fallen less than the Case-Shiller index*), that net worth is probably between $90,000 and $95,000 - significantly less than in 2004, and back around 1998 levels ($91,300).
One of the reasons why the real estate crash has hurt so much is because rising home prices were driving consumer spending, and consumer spending accounted for something like 70% of GDP. So when home prices fell, households saw their net worth shrink and started to save instead of spend, causing GDP to fall.
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