To be believable, any response to the global economic crisis must deal simultaneously with all  three  of the problems we face, namely the credit shortage, ageing societies, and global warming- in  a single internally consistent policy.   People will only begin to spend and invest again if they feel their  Governments are following  consistent  policies in which they can believe .
Economic policy making lacks credibility with the public at the moment because these three problems-credit shortage, ageing, and climate- are being tackled separately.
The public knows instinctively that a return to the pre crisis economic model of high levels of credit and wasteful consumption is unsustainable demographically and environmentally and this makes  them sensibly reluctant to respond to Government directed “stimulus” by spending more.  The public, unlike the experts who are working away in their separate cocoons marked economy, ageing and climate, know that the three problems interact with one another, and that an attempt to solve one must be designed in a  way that helps solve the other two , or we will  end up wasting scarce political and economic capital. 
  Policymaking on these three related topics cannot be left, as at present, to financial experts, to demographers or to climate scientists, each arguing in separate fora, independently of one another.
 It is for political leaders to bring these three strands together and present a new model of society based on a new model of consumption of goods and services. That is the intellectual challenge of our times.
 Ideologies devised in the nineteenth or twentieth century, when physical and human resources were virtually unlimited, are of little help to us in facing this twenty first century challenge. Keynes did not have to apply himself to the problem of climate change.  Marx and Hayek did not have to concern themselves with ageing societies.
 The German Bundesbank has criticised other countries for running large balance of payments deficits over the years.  Apart from the fact that countries that are developing rapidly have a good reason to run a payments deficit, because they need to import machinery and capital to  build a bigger  productive infrastructure to support a bigger economy, but  the Bundesbank should not criticise balance of payments deficits as such because, if Germany is to continue its policy of running balance of payments surpluses,   someone else somewhere  must  run a deficit !
German commentators should recognise the inherent risks for a country with a consistently big surplus. Surpluses force it to buy foreign assets and it is easier to make mistake buying something abroad than it when one is buying things at home, with which on is necessarily more familiar.  If Germany did not have balance of payments surpluses in recent years, its banks would not have  found themselves buying quite so many of  the bonds of the countries whose  deficits the Bundesbank now  criticises.  Both lender and borrower have a responsibility if a foolish lending decision is made.
That said, I think the “Anglo Saxon” economists who are demanding that the German Government stimulate its economy by encouraging more private spending should ask themselves how they  reconcile this proposed stimulus with the other   two major concerns of the present time, the ageing of western societies and climate change
The cost of pensions and healthcare will rise as German society ages, so it makes complete sense for Germany to accumulate surplus cash to meet these costs.  The German birth rate is very low and  Germany must compensate for the inevitable decline in its taxpaying,  working population, by saving putting money, and putting it aside  for the  time when these  workers retire and  are no longer paying as much tax. Those American and other Keynesian economists, who demand that Germans spend more and save less now, need to come up with a better answer to that dilemma.  Does Paul Krugman really think it would be wise for Germany to blow all its savings on  buying American exports today, when it has so many extra things  it  knows it will have  to use those savings to pay for tomorrow?
Likewise, if Germans and Chinese save more and spend less, fewer consumer goods have to be  flown across the globe to Germany and China, and there will be less  carbon emissions caused by the manufacture and  disposal of these   goods. No matter how many initiatives are undertaken to increase the carbon efficiency of extra production, any extra production involves more carbon emissions than if the extra goods were not produced at all.
A sustainable and believable response to the global economic crisis must deal with the three problems we face-credit shortage, ageing societies, and global warming- by means of a single consistent policy.
 That policy cannot be left to financial experts, to demographers or to climate scientists, each operating in separate sphere, independently of one another.
 It is for national and global political leadership to bring the three strands together and present a new model of society and of consumption of goods and services. That is the intellectual challenge of our times, and ideologies devised in the nineteenth century when physical and human resources  were  virtually unlimited, are only of limited help to us in facing this  twenty first century challenge. In a phrase beloved of Tony Blair, we need joined up thinking…not just joined up rhetoric!
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