From Paul Krugman:
So, in order:
1. The economy isn’t like an individual family that earns a certain amount and spends some other amount, with no relationship between the two. My spending is your income and your spending is my income. If we both slash spending, both of our incomes fall.
2. We are now in a situation in which many people have cut spending, either because they chose to or because their creditors forced them to, while relatively few people are willing to spend more. The result is depressed incomes and a depressed economy, with millions of willing workers unable to find jobs.
3. Things aren’t always this way, but when they are, the government is not in competition with the private sector. Government purchases don’t use resources that would otherwise be producing private goods, they put unemployed resources to work. Government borrowing doesn’t crowd out private borrowing, it puts idle funds to work. As a result, now is a time when the government should be spending more, not less. If we ignore this insight and cut government spending instead, the economy will shrink and unemployment will rise. In fact, even private spending will shrink, because of falling incomes.4. This view of our problems has made correct predictions over the past four years, while alternative views have gotten it all wrong. Budget deficits haven’t led to soaring interest rates (and the Fed’s “money-printing” hasn’t led to inflation); austerity policies have greatly deepened economic slumps almost everywhere they have been tried.
5. Yes, the government must pay its bills in the long run. But spending cuts and/or tax increases should wait until the economy is no longer depressed, and the private sector is willing to spend enough to produce full employment.