John At The Center

Now suppose that we had a way to raise the multiplier by more than half, from 1.8 to 2.8.  The same fiscal stimulus would now produce an increase in GDP of $2.8 trillion–quite a difference. Nice deal if you can get it.

In fact you can. It is pretty easy to increase the multiplier; just raise import tariffs by enough so that the marginal propensity to import out of income is reduced substantially (to zero if you want the multiplier to go all the way to 2.8).

http://www.marginalrevolution.com/marginalrevolution/2008/12/their-weird-o-1.html