Savings glut, secular stagnation, demographic reversal, and inequality: beyond conventional explanations of lower interest rates

Interest rates have declined over the last forty years, a period of increasing inequality. The steady decline in interest rates has been interpreted by and large as resulting from a decline of the natural rate of interest. This paper surveys the main explanations associated with the notion of a decline in the natural rate of interest, including the savings glut and the secular stagnation hypothesis. It analyzes the views according to which demographic forces were behind the decline, and might perhaps be associated to a future rise of the same natural rate. It also discusses the view according to which the role of inequality has been also to affect the natural rate of interest. Finally, views that discuss the role of monetary and financial factors, including the so-called global financial cycle literature, are discussed. It is argued that the conventional view suffers from logical and empirical problems that are ultimately unsurmountable. A brief critique of the notion of a natural rate of interest, and alternative monetary theory of the decline of interest rates, as determined exogenously by the monetary authority of the hegemonic country, the United States, is proposed.