Fig. 6: Dependence of the heaviness of tails of wealth distribution on environmental parameters and family systems.
From: Evolution of family systems and resultant socio-economic structures
a Lightness of the poor tail α given by the power-law fitting wα. b Lightness of the rich tail β given by the exponential fitting \(\exp (-\beta w)\). Smaller α and β show heavier tails for the poor and rich sides, respectively. c, d Averaged value of α (c) and β (d) classified by the dominant family system (stem, community, absolute nuclear, and egalitarian nuclear families) in each society, with error bars. Values for the environmental parameters fixed to ϵ = 0.0003 and c = 1.5 are plotted in black, whereas those averaged over ϵ = 0.0001, 0.0003, 0.001, 0.003 and c = 1.0, 1.2, 1.5, 2.0 are plotted in red.
