分层社会中的经济交换：中产阶级的终结？
Economic exchanges in a stratified society: End of the middle class?
摘要：
我们研究了社会分层对财富分配的影响，这是一个由相互作用的经济主体组成的系统，这些经济主体只在自己的经济阶层内相互作用。代理人的经济流动性与其在交换交易中的成功有关。不同的财富分布作为经济阶层宽度的函数。我们发现了一系列的宽度，其中社会被分为两个阶级，两个阶级被一个很深的鸿沟隔开，这个鸿沟阻止了穷人和富人之间的进一步交换。结果，中产阶级被淘汰。在这些情况下获得的基尼指数值很高，表明社会高度不平等。另一方面，较低和较高的宽度导致较低的基尼指数和更公平的财富分配。
英文摘要：
We study the effect of the social stratification on the wealth distribution on a system of interacting economic agents that are constrained to interact only within their own economic class. The economical mobility of the agents is related to its success in exchange transactions. Different wealth distributions are obtained as a function of the width of the economic class. We find a range of widths in which the society is divided in two classes separated by a deep gap that prevents further exchange between poor and rich agents. As a consequence, the middle wealth class is eliminated. The high values of the Gini indices obtained in these cases indicate a highly unequal society. On the other hand, lower and higher widths induce lower Gini indices and a fairer wealth distribution.
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