The logic of this paper is based on a modernization of Austrian capital theory as applied to a closed economy growing in a steady state. Here the philosophy is this: capital is time embodied in produced goods. In steady states, this philosophy works well as an aggregation device for an arbitrary number of distinct produced goods. The basic theorem of this approach (Section VII) is this: in a capital market equilibrium without public debt and hence in a general equilibrium without public debt the average period of production equals the average waiting period of households. Calibration of the parameters of the production sector and the consumption sector then leads to the result that the equilibrium risk free real 'rate of interest (Wicksell's 'natural rate of interest') is negative for the OECD China area. What distinguishes the twenty-first century from earlier times is the high life expectancy of people and the ensuing extensive average pension period. These characteristics are responsible for the high average waiting period. Only with a negative real rate of interest can the average period of production catch up with the high average waiting period. Under price stability the risk free real rate of interest cannot become negative [...]