Reasons for the Demise of Interest: Savings Glut and Secular Stagnation or Central Bank Policy?

This article compares the Keynesian, neoclassical and Austrian explanations for low interest rates and sluggish growth. From a Keynesian and neoclassical perspective, low interest rates are attributed to aging societies, which save more for the future (global savings glut). Low growth is linked to slowing population growth and adecliningmarginal efficiency of investment as well as to declining fixed capital investment due to digitalization (secular stagnation). In contrast, from the perspective of Austrian business cycle theory, interest rates were decreased step by step by central banks to stimulate growth. This paralyzed investment and lowered growth in the long term. This study shows that the ability of banks to extend credit ex nihilo and the requirement of time to produce capital goods invalidates the permanent IS identity assumed in the Keynesian theory. Furthermore, it is found that there is no empirical evidence for the hypotheses of a global savings glut and secular stagnation. Instead, low growth can be explained by the emergence of quasi “soft budget constraints” as a result of low interest rates, which reduce the incentive for banks and enterprises to strive for efficiency. Prof. Dr. Gunther Schnabl together with Prof. Dr. Thomas Mayer.