Professor Krugman nails it as usual:
“The worst thing you can do in these circumstances is slash government spending, since that will depress the economy even further. Pay no attention to those who invoke the confidence fairy, claiming that tough action on the budget will reassure businesses and consumers, leading them to spend more. It doesn’t work that way, a fact confirmed by many studies of the historical record.
“Indeed, slashing spending while the economy is depressed won’t even help the budget situation much, and might well make it worse. On one side, interest rates on federal borrowing are currently very low, so spending cuts now will do little to reduce future interest costs. On the other side, making the economy weaker now will also hurt its long-run prospects, which will in turn reduce future revenue. So those demanding spending cuts now are like medieval doctors who treated the sick by bleeding them, and thereby made them even sicker.”
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