企业规模分布的双峰性：一个动态交换模型方法
Bimodality in the firm size distributions: a kinetic exchange model approach
摘要：
众所周知，发展中经济体的企业增长过程会在其增长路径上产生分歧，从而导致规模分布的双峰性。在财富分配方面也观察到类似的双峰现象。在这里，我们介绍了一个修改后的动力学交换模型，可以重现这些功能。特别地，我们将用数值的方法证明非线性的留存率（或储蓄倾向）会导致这种双峰性。该模型既能适应二元交易，也能适应整个系统端交易，从而更适合解释财富分布和企业规模分布的非标准特征。
英文摘要：
Firm growth process in the developing economies is known to produce divergence in their growth path giving rise to bimodality in the size distribution. Similar bimodality has been observed in wealth distribution as well. Here, we introduce a modified kinetic exchange model which can reproduce such features. In particular, we will show numerically that a nonlinear retention rate (or savings propensity) causes this bimodality. This model can accommodate binary trading as well as the whole system-side trading thus making it more suitable to explain the non-standard features of wealth distribution as well as firm size distribution.
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