I will argue that those phenomenons can all be ascribed to two common causes: a worldwide based shift in the primary distribution of income; and asymmetries in financial development among countries. Together, they combine to produce (1) excess saving in emerging economies (2) strong capital inflows to the US (3) an increasing frequency in financial booms and busts and asset price bubbles in both advanced and emerging economies. Let’s look first at income distribution. In China, the share of wages in GDP has declined from 55% in 1992 to 48% in 2008. In the US, the median real wage has been stagnant over the last fifteen years despite the fact that real GDP has grown annually by above 3% over the same period. These are deep changes mostly driven by technology and demographics, in proportions which are hotly debated, and partly unexplained. In contrast to wage developments, consumption trends have been widely divergent. In China, the share of consumption has gone down by more than 10 % of GDP over the last decade. In the US, consumption kept growing (both in absolute and in GDP share) fueling the demand for imports. Households in the US could consume more and save less because they felt richer. And they felt richer because the value of their houses and financial assets was rising at a quick pace and that trend was expected to persist. Broadly speaking, the worldwide equilibrium between demand and supply of goods was based on a continuing asset price bubble in the United States.
There are good arguments to create international instruments providing a reliable store of value. There are also conceptual and political difficulties. A choice would have to be made as to the true nature of the “super reserve currency”. Would it be a basket of existing monies such as the SDR today? Or would it be a new “fiat” currency? More fundamentally, a new reserve currency would, in fact, grant a collective guarantee against exchange risk. This guarantee would benefit surplus countries and would be given by deficit countries. When the substitution account was discussed more than 25 years ago, it became clear, at the time that it would have to be part of a package encompassing explicit, binding and symmetric rules on balance of payment adjustments. Most likely, the same questions would be raised again today and the creation of a new reserve currency would have to be part of a broader framework. That may take time, as our Chinese colleagues are fond of reminding us when we discuss those issues. 4  BIS Review 170/2010  In the meantime, financial development in emerging economies can go a long way towards expanding the range of safe and liquid financial assets available to domestic and international investors. Capital markets in local currencies have developed significantly over the last decade as fiscal positions in emerging countries have dramatically improved. There seems to be considerable scope for regional financial and monetary arrangements to prosper in the future.