The soft landing out of the debt-ridden capitalistic society towards a more stable state-like bio-based socio-economy is by means of a gradual population decrease. An economically still viable (aka safe) fertility rate of 1,6 instead of a 2,1 replacement rate per couple means that grosso modo many single children inherit over a lifetime accumulated property of two adults. This creates a small but constant "economic growth per capita" until a new plateau (at land-carrying capacity equilibrium) is reached.

1.6 means 2 out of 10 couples choose to remain childless, or 4 out of 10 choose to only have a single child and other combinations.