If I may say so, you, like most people, probably think of the national economy as like a household, which is something we all understand at least to some degree. For a household to borrow money, to spend more when its income is reduced is a reckless policy that will eventually lead to financial ruin. However, the national economy, even though it comprises, among other things, all the households in the country, is itself nothing like a household. A better analogy would be to a human body for which demand, i.e. borrowing and spending, is like flowing blood. If the blood doesn't flow the body will die. Unlike a human body though, the economy can die in pieces and to a degree, but as far as the essential life-giving aspect of maintaining demand the analogy has value.
I agree that are profound difference household economy and national economy. But I think it is important to understand that there is also profound differences between the national economy of 2012 and the world of John Maynard Keynes in 1933 when
The Means to Prosperity was written. A lot has changed in the last 75+ years and some of the Keynes ideas which made sense during the Great Depression may no longer make sense as cure for the Great Recession.
One main differences is the size of government, back in the 30s total government (Fed+local) spending was in the teens for most developed countries. Now days it is 35% to almost 50% in Northern European countries. What this means is that if we increase the deficit spending by 5% of GDP (say from 3% to 8%), if government was 15% back in the 30s and goes to 20% that much larger increase than 30-35% today. This decreases the multiplier effect.
Second capital is vastly more liquid than it was back in the last century,much less in the 1930s. It isn't just the obvious things; how I can shift 200K from the US equity markets to the international equity markets with a few mouse clicks. How computerized trading program can shift billions in milliseconds. In search of higher returns I have been flying into Vegas and buying rentals properties. I can do a lot of looking at these properties, get assessment of the fair market price from my house in Hawaii something not possible a decade ago. But what is truly remarkable is my Realtor in Vegas has investors not only from the out of town, but from foreign countries like Canada and the Philippines and she's never even met some of them.
I am not a big fan of analogies but to me a much better one is the national economy is network on the internet. We have watched for 20 years as government have tried and fail to keep information from their citizens. As one of the internet pioneers said "the internet treats censorship as damage and routes around it." I think the same thing is true of capital markets , when central banks try to manipulate the currency and government try and play games with fiscal policy. The markets (eventually) see through the game and gets around it searching for the highest risk adjusted return. The result is these policies are far less effective than predicted and there are unintended consequences.
So for instance in QE3 Bernanke acknowledges that this will be painful for retirees and savers. Lower interest rates means lower spending for retirees like myself with no pension or social security, counteracting some of the stimulus. One of the best explanation I've seen what is really behind QE3 is attempt to trigger the wealth effect, if our 401Ks go up and houses price raise because of even lower mortgage rates maybe we will spend more. However, what isn't talked about is that some of the money Bernake creates will flow into other asset class like commodities; precious metals, oil, gas, agricultural products. The higher prices of these will increase cost to both business and consumers further counter acting the stimulus effect.
The one thing that has not changed since Keynes times is the mobility of labor. In part because of the housing crisis, it is not much easier for unemployed mortgage loan broker to travel to the Dakotas to work in the oil fields than it was for the Okie farmer to go to California and get job in the aviation business in the 1930s.
But what has changed is in last decade or so is we have seen a billion new worker in the BRIC countries move from subsistence agriculture to become part of the global economy. A billion new workers means lower wages and the developed world has been very slow to accept this. Despite all the prattle about American workers are the most productive in the world, I am skeptical. But I am especially skeptical than a factory with 100 American workers and 10 million in capital is much more productive than 100 Chinese workers and 10 million in capital. Since it is easy for capital to move, I think the productivity gap between developed country workers and Asian workers will continue to narrow and so will wages.
For much of the last decade we have been in denial about these lower wages. Individuals have maintained their standard of living by borrowing heavily. Countries have attempted to cushion the blow, by borrowing heavily from the Chinese and other, in order to provide their citizens with better health care, pensions, earlier retirement ages, and shorter work weeks. I'm afraid the game ended back in 2008 and people simply need to accept that we are going have to live with the hangover of our excesses from earlier in the decade.
Sure in the short term a few stiff drinks sound very appealing but in the long run, heavy drinking will kill us to use your body analogy.