This view of a worldwide saving glut responsible for low levels of interest rates is disputed by
neoclassical economists like the German economist
Hans-Werner Sinn, who claims that it was the monetary policy of the US
Federal Reserve in the 1990s which kept interest rates too low for too long. In addition, the policy of the US government encouraged private debt to promote private consumption. This led to a lack of savings in the US which was then provided from foreign countries on a basis which was not sustainable. Carl Christian von Weizsäcker follows Ben Bernanke claiming that aging populations which save more than can be profitably invested lead to a saving glut and negative equilibrium rates of interest which makes public deficits necessary to fill the gap between excess private savings and private investment. From the perspective of
monetary economics, the savings glut idea has been criticized as conceptually flawed, ignoring the role of
credit creation, and related unsustainable asset price booms. Further, the composition of cross-border financing flows cannot be determined just from the
net capital flows, and analysis on this basis yields flawed conclusions. In his 2008 article entitled "Competing Explanations: A Global Saving Glut", Senior Fellow in Economics at Stanford University's
Hoover Institution,
John B. Taylor, stated that there was "no evidence for a global saving glut". Using an International Monetary Fund 2005 graph, he argued that "the global saving rate—world saving as a fraction of world GDP—was very low in the 2002–2004 period especially when compared with the 1970s and 1980s". According to Taylor, "[T]here was a gap of saving over investment in the world outside the United States during 2002–2004, and this may be the source of the term "saving glut". But the United States was saving less than it was investing during this period; it was running a current account deficit which implies that saving was less than investment. Thus the positive saving gap outside the United States was offset by an equal sized negative saving gap in the United States. No extra impact on world interest rates would be expected. As implied by simple global accounting, there is no global gap between saving and investment." Taylor argued that the global
gross savings rate (not necessarily the net savings rate) during the 2000s was slightly higher than savings rate in the 80s or 90s according to IMF data.
Niall Ferguson in
The Ascent of Money, published in 2008, examines the long history of money, credit, and banking. In it he predicted a financial crisis as a result of the world economy and in particular the
United States using too much credit. Specifically he cites the
China–
America dynamic which he refers to as
Chimerica where an Asian "savings glut" helped create the
subprime mortgage crisis with an influx of easy money.
Thomas Mayer and Gunther Schnabl argue that the Keynesian economic theory widely omits the banking sector, and therefore interest rate changes by central banks have a direct impact on investments. In contrast, in the
Austrian economic theory the banking sector plays a crucial role for transmission of monetary policy. Low interest rates could lead to malinvestment and speculative exuberance on financial markets, which can impair long-term growth. Mayer and Schnabl find no empirical evidence for the savings glut hypothesis nor for the secular stagnation hypothesis. Instead, low growth is explained by the emergence of quasi "soft budget constraints" resulting from low interest rates that reduce the incentive for banks and firms to strive for efficiency (zombification). ==See also==