This study examines dynamic interdependence between different socio-cultural
groups? birth rates, mortality rates, populations, wealth accumulation, and
the allocation of time between work, leisure, and childcare. It emphasises
the role of changes in human capital, technology, and preferences on birth
and mortality rates and time allocations. The economic mechanism of wealth
and income distribution is based on the Walrasian general equilibrium
theory, and wealth accumulation is based on the Solow growth model. The
paper uses a utility function proposed by Zhang (2015) to describe the
behaviour of households. It also models group and gender differences in
human capital, the propensity to have children, the propensity to use
leisure time, and the efficiency of childcare. The paper uses differential
equations to describe the dynamics of group differences in wealth, income,
birth rates, mortality rates, and populations. I simulate a model to show
the motion of the system and identify the existence of an equilibrium point.
I also examine the effects on the dynamics of the economic system of changes
in the propensity to have children and the propensity to save, and in gender
differences in the propensity to use leisure, in human capital, and in
emotional involvement in childcare.