The Natural Rate of Interest was defined by Wicksell as the real rate of interest on the capital market which equates saving and investment under conditions of prosperity (full employment) and absent public debt. Preceding Wicksell Eugen von Böhm-Bawerk gave three facts of life, which together induce a positive natural rate of interest. He was right for his time (1889). But this time is long ago. Due to changed demographics the propensity to save has substantially increased. Thus the roundaboutness of production has reached its productivity maximizing level. Were it not for substantial public debt the equilibrium level of interest would be strongly negative. Thus the natural rate of interest is negative.
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