As I will discuss in more detail later, one well-understood source of the saving glut is the strong saving motive of rich countries with aging populations, which must make provision for an impending sharp increase in the number of retirees relative to the number of workers.
With slowly growing or declining workforces, as well as high capitallabor ratios, many advanced economies outside the United States also face an apparent dearth of  national saving is not affected by this qualification, however, as government investment and the implied adjustment to national saving cancel each other out. BIS Review 16/2005  3  domestic investment opportunities.