I'm a little surprised no one has mentioned Harvard economist Greg Mankiw. He avoids much of the political polarization associated with Krugman or eve the less ideologial spin of Sowell, whom I rather like, and he's positioned as a Keynesian with skepticism.
It was interesting that in academia there is a divide among the most prestigious economics departments. I don't recall the whole list Krugman cited but
U of Chicago vs
UC Berkeley were on opposite sides of the isle.
Are we talking about the freshwater/saltwater schools ? Krugman made around of TV interviews in May and said essentially the same on all. It's his now tired refain that we need much more stimulus now, and that the massive debt accumulation is not a problem for entirely hand-wavey reasons. In his CNN interview, when specifically asked his explanation was that a nation like the US w/ sovereign currency can tolerate much higher debt loads (translation: we will inflate away the debt as well as your savings in the future).
I believe, as I think Krugman was saying, that political ideology is particularly prevalent and distorts the conclusions regarding the evidence in the science of economics. You don't see the same thing, for example, in the science of medicine or astronomy. Krugman challenged anyone to provide the evidence that austerity was the way out of a recession.
If that is what Krugman actually said (which interview GS?) then it's a silly strawman; no one rational has ever suggested that austerity addressed recession. This is however typical of much of Krugman's mis-characterizations of dissenting ideas; it avoids having to answer the hard questions.
It is thought by many that tax cuts are far more stimulative than government spending and avoids the sort of inefficient market issues we see with GM or Solyndra. It is also believed by more than a few that the massive debt causes long-term decline in growth. Keynes' quip about "long run ... dead" doesn't answer that concern if you interest include future decades or generations.
As for evidence base theories - Keynesian-ism is certainly not the poster child for the scientific method. Keynes developed his theories ad hoc and as a result several decades of effort went into revision, retrenchment, rationalization, ex post facto collection of correlate data to support it; resulting in several flavors of neo-Keynesianism that we today call 'Keynesianism'. This is quite different from the early Chicago School, or some even currently at MIT where empirical data was drove the macroE hypotheses.
At the same time there are dozens of historical examples that government spending when the problem is lack of demand as it is now does indeed result in an economic turnaround.
Then naming a dozen should be easy for you.
In addition and as a separate note, Krugman said the Republics were totally dishonest in that if Romney is elected they will spend like Bush did and simply let the deficit grow with their 'no tax increases on the rich' ideological folly.
"Republics" ? Grow up!
I seriously doubt Krugman actually presented the ideas as you state them. I have no party affiliation and don't particularly care for Romney, however even a politically biased journalist like Krugman is unlikely to try to resurrect tired "Romney=Bush=evil=liar" trope. Tell me in which interview did he say this ? Even Krugman recognizes taxing the rich doesn't solve a deficit problem; it's a political side-show topic which is why he has carefully avoided making any such statements in the past. I think you heard what you wanted to hear - not what was said.
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Yes, more stimulus, it's not a difficult concept. It helped in '09 but it's not been enough and there have been problems getting the money actually spent. I agree that spending aspect needs to be addressed but simply throwing up your hands and saying it can't be done isn't an answer, just as putting more money in the hands of the rich isn't an answer.
Why isn't it the answer ?
A little light reading from Mankiw,
http://www.economics.harvard.edu/faculty/mankiw/files/Is Govt Spending Too Easy.pdf
The main points are these. The neo-Keynesian supporters believe that government spending results in a GDP multiplier around 1.4x or alternatively the current Whitehouse pegged the multiplier for the stimulus at 1.57 (however we expect that is politico-optimism). However some Keynesian schoolers studying that empirical data SGinger sometimes praises believe that tax-decreases have a multiplier around 3x !. So if the govenment spends a dollar it increases the GDP by an addiional 57 cents beyond the direct spending. If the Keynesian researchers are right - then if the govenment reduces tax by the same $1, it results in an additional $2 of GDP growth.
Who are these renegade empirico-Keynesians who belive tax cuts are better than stimulus ? None other than Christina D. Romer and her husband David Romer, econo-profs at UC Berkeley. Christina was of course the former Chair of the Obama admin Council of Economic Advisers. (fwiw Mankiw was best-man at their wedding).
So the looming questions you neo-Keynesians MUST answer are these -
Why are you choosing the less effective "least bang for the buck" method of addressing the recessions; why stimulate for a 40-57 cent/$ gain rather than tax less for a $2/$1 gain ? I think there is, at issue, the socialist agenda of making everyone dependent on government, and a socialist predilection toward central planning.
Do we really want to increase GDP by creating useless product ? Keynes wrote that setting bottles of pound notes into disused coal mines would immediately cure unemployment and increase GDP. Following this idea the Obama-ites placed wads of dollar bills into any half-baked green-energy plan. I am not solely blaming Obama - The grain-ethanol expenditures were equally incompetent. Keynes was not delivering a prescription but a joke, but it does point up the gross inefficiency of government vs private spending. We can end unemployment by hiring everyone to stay home and watch TV, this does improve nominal GDP, but it doesn't mean there isn't any useful product increase.
HOW WILL IT ALL END? The Great-Depression/WW2 events were primarily a US phenomena, and it resulted in a massive increase in government size. Is that really what we want ? What is the LT impact of all this debt accumulation ? Can it any in any way other than inflation ?
The other bit that Keynesians ignore is the work of Robert Lucas, Jr. (Nobel economist) on rational expectation. Yes the Fed, as Krugman said on CNN, can manage interest rates very to keep debt payment low, so long as their is demand for those bonds. The market for those bonds evaporates when there is rational expectation that they will not be repaid at a premium to cost. Recently the Fed has been purchasing ~60% of bonds issued
http://www.moneynews.com/Headline/fed-debt-Treasury/2012/03/28/id/434106
this has the impact of keeping market supply low, prices high and interest rates low; however it seems unsustainable. Once there is a market consensus that these bonds are worth less than the price, the Fed will be unable to prop up the price. I think we are about one good sneeze away from disaster. Of course the problem is greatly exacerbated by deficits whether they come from inefficient gov't stimlus or tax cuts. At least in the case of tax cuts we expect growth to be dictated by economic individual need at efficient market prices; rather than centrally planned spending on boondoggles.
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No, the rational expectation today is that US bankruptcy law is a meaningless protection to investors of companies like GM or big banks. The security of the asset will not be based on law but on ad-hoc plans of the Whitehouse (Bush and/or Obama). The expectation is that if you are a more prudent manager of companies- like Ford or Toyota or JPMorgan - that you will be punished by the government giving your competition a bailout. The expectation is that certain favored political money-bundlers will have their pie-in-the-sky green energy investments well funded regardless of the economic potential. The expectation is that government will stimulate with a QE#n, whenever the econ slow enough or political enough to matter. It seems there is no consensus expectation about what tax rates will be next year, what the federal budget will be, or what onerous rules and regulations will be imposed.
All of these expectations and manufactured uncertainty have real and negative consequences the economy, productivity and investment.
With ~3.3% inflation people still invest in 10yr bonds yielding 1.6% before tax; what does that say about investor risk tolerance ? They'd rather lose 2+% of value than take a chance with these highly uncertain and rapidly changing federal policies creating turmoil in private markets. Private markets can't grow with that sort of fear on the air.