Dispatching Krugman and his "Crude Keynesianism" too

At Huffington Post, economist Jeffrey Sachs dissects Krugman's recent claims that we don't have a deficit problem and explains why Great Depression-era thinking does not apply to today's world.  Most importantly, Professor Sachs looks long-term and rejects the approach that "spending is spending" and short-term projects (or tax cuts) are as effect as the real thing.  A sample of the must-read below:

I have argued against short-term stimulus packages. Krugman has supported them, and indeed argued that they should have been even larger. I have been against temporary tax cuts and temporary spending programs, believing that instead we need a consistent, planned, decade-long boost in public investments in people, technology, and infrastructure. Such a sustained rise in public investment should have been paid for by ending the Bush-era tax cuts in 2010, or by adopting a comparable boost in revenues. Instead Obama and Congress have now made almost all of those tax cuts permanent, putting us into a deeper fiscal bind.

Yesterday, Krugman responded to my recent op-ed by digging in deeper on the deficit question. He argued yet again that the U.S. can and should incur more debt to pay for a short-term boost in aggregate demand. While he did not lay out a quantified plan (that has been the case from the start, so it's hard to know exactly what Krugman has in mind in a quantitative sense), the CBO has recently estimated that without the recent deficit-reduction actions of the White House and Congress, the public debt would rise to around 87 percent of GDP in a decade. I presume that Krugman would support that trajectory or something like it (he should tell us by now what path of deficits he actually recommends).