Entropy, directionality theory and the evolution of income inequality
提出一种基于社会动态收入生成过程的宏观演化理论，区分分散和集中两种过程，发现分散过程促进平衡互惠互动和收入平等，而集中过程则相反，且更平等的社会从冲击中恢复更快。
A macro-evolutionary theory of income inequality is proposed that is based on a society’s dynamic income generating process. Two types of processes are distinguished, namely dispersing and concentrating ones. A basic result shows that dispersing processes provide a selective advantage for more balanced and mutualistic interaction; whereas concentrating ones favor weaker, less balanced and less mutualistic interaction. We also show that societies with more balanced and mutualistic interaction induce more income equality and a non-stratified society, while less balanced and less mutualistic ones induce more inequality and a possibly stratified society. Also, more equal societies are more resilient in the sense of being quicker to recover from shocks and return to steady state than less equal ones. Stylized examples of pre-modern and modern societies are briefly discussed.