Economics and the 2008 crisis: a Keynesian view 
5 When equilibrium is not enough
Keynes believed that an economy may settle into equilibrium at a level of income too low to support full employment.
We can use our model to illustrate this possibility and to illustrate how policy intervention to stimulate aggregate demand may bring about full employment.
OpenLearn - Economics and the 2008 crisis: a Keynesian view 
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