
Put succinctly the global savings glut hypothesis describes the shift in GDP from the lower-saving developed world to the higher-saving developing world that is purportedly increasing the global supply of savings, suppressing long term real interest rates and leading to current account deficits in the developed world. As evidence economists often point to the fact that China’s national savings rate is over 50% and the U.S. national savings rate is negative at the same time that our GDP hovers under 1% and China’s is still in the double digits.
Our two most recent Fed Chairman — Alan Greenspan and Ben Bernanke — are fans of the Global Savings Glut hypothesis. And it seems every major newspaper and reputable blogger has chimed in on the issue at one point or another (Just google “global savings glut” and you will find articles by Business Week, the Washington Post, DeLong, Roubini, Mish, and the Cato Institute — all on the first page of Google results). It begs to reason then that a thorough understanding of the arguments for and against the hypothesis are critical if one is to understand U.S. monetary policy, since many influential U.S. policy makers subscribe to it in one form or another.
Here is Ben Bernanke’s view of the role of the global savings glut:
. . . over the past decade a combination of diverse forces has created a significant increase in the global supply of saving–a global saving glut–which helps to explain both the increase in the U.S. current account deficit and the relatively low level of long-term real interest rates in the world today. . . a particularly interesting aspect of the global saving glut has been a remarkable reversal in the flows of credit to developing and emerging-market economies, a shift that has transformed those economies from borrowers on international capital markets to large net lenders.
Alan Greenspan goes one step further in The Age of Turbulence:
. . . global economic forces that had driven long-term interest rates lower and ignited a sharp rise in home prices in many parts of the world. In the United States homes had increased in value so much that households, feeling flush, seemed more willing to spend.
So there you have it, Bernanke blaming the current account deficit and Greenspan blaming the housing bubble on this supposed savings glut. So the question becomes is this even possible? Why do households in the developing world save so much of their incomes? Well there are two components of savings, household saving and national saving. IMF research using household-level data from China provides some clues on the household side:
The precautionary motive for saving is very strong among Chinese households because of the lack of an adequate pension system and the sharply rising costs of health care. Demographic factors add to this saving motive: The one-child policy instituted in the 1970s to control population growth has intensified the aging of China’s population. The need to finance education expenses has also bolstered saving.
The slow development of financial markets in China has meant limited availability of credit, so that households generally have to save in order to purchase big-ticket items, like houses and cars, rather than being able to borrow against future income. It also has meant that there are low returns on households’ financial assets and limited opportunities for portfolio diversification, since there are few alternatives to depositing savings in state-owned banks.
But it isn’t just household savings that lead to China and other countries high national savings rates, it is government savings in the form of accumulated foreign reserves. James Fallows describes the process of how China sterilizes foreign capital inflows, leading to increased “national” savings:
Let’s say you buy an Oral-B electric toothbrush for $30 at a CVS in the United States. I choose this example because I’ve seen a factory in China that probably made the toothbrush. Most of that $30 stays in America, with CVS, the distributors, and Oral-B itself. Eventually $3 or so—an average percentage for small consumer goods—makes its way back to southern China.
When the factory originally placed its bid for Oral-B’s business, it stated the price in dollars: X million toothbrushes for Y dollars each. But the Chinese manufacturer can’t use the dollars directly. It needs RMB—to pay the workers their 1,200-RMB ($160) monthly salary, to buy supplies from other factories in China, to pay its taxes. So it takes the dollars to the local commercial bank—let’s say the Shenzhen Development Bank. After showing receipts or waybills to prove that it earned the dollars in genuine trade, not as speculative inflow, the factory trades them for RMB.
This is where the first controls kick in. In other major countries, the counterparts to the Shenzhen Development Bank can decide for themselves what to do with the dollars they take in. Trade them for euros or yen on the foreign-exchange market? Invest them directly in America? Issue dollar loans? Whatever they think will bring the highest return. But under China’s “surrender requirements,” Chinese banks can’t do those things. They must treat the dollars, in effect, as contraband, and turn most or all of them (instructions vary from time to time) over to China’s equivalent of the Federal Reserve Bank, the People’s Bank of China, for RMB at whatever is the official rate of exchange.
With thousands of transactions per day, the dollars pile up like crazy at the PBOC. More precisely, by more than a billion dollars per day.
As you can see there are several logical arguments that would lead one to believe that this savings glut hypothesis is a major factor in many of the global monetary imbalances we have witnessed over the past 10-15 years. But, while many people subscribe to this theory there are several other prominent economists who disagree. I will cover their arguments next week.
Hat Tips:
The Global Savings Glut and the U.S. Current Account Deficit - Ben Bernanke
The $1.4 Trillion Dollar Question - James Fallows
The Age of Turbulence - Alan Greenspan