http://www.nytimes.com/2013/01/07/opinion/krugman-the-big-fail.html?nl=todaysheadlines&emc=edit_ee_20130107&_r=1&
"...It’s tempting to argue that the economic failures of recent years prove that economists don’t have the answers. But the truth is actually worse: in reality, standard economics offered good answers, but political leaders — and all too many economists — chose to forget or ignore what they should have known.
The story, at this point, is fairly straightforward. The financial crisis led, through several channels, to a sharp fall in private spending: residential investment plunged as the housing bubble burst; consumers began saving more as the illusory wealth created by the bubble vanished, while the mortgage debt remained. And this fall in private spending led, inevitably, to a global recession.
For an economy is not like a household. A family can decide to spend less and try to earn more. But in the economy as a whole, spending and earning go together: my spending is your income; your spending is my income. If everyone tries to slash spending at the same time, incomes will fall — and unemployment will soar..."