Economic systems are similar with physic systems for their large number of individuals and the exist of equilibrium. In this paper, we present a model applying the equilibrium statistical model in economic systems. Consistent with statistical physics, we define a series of concepts, such as economic temperature, economic pressure, economic potential, wealth and population. Moreover, we suggest that these parameters show pretty close relationship with the concepts in economy. This paper presents related concepts in the equilibrium economic model and constructs significant theorems and corollaries, which is derived from the priori possibility postulate, getting theorems including the equilibrium theorem between open systems, the distribution theorem of wealth and population along with related corollaries. More importantly, we demonstrate a method constructing optimal density of states, optimizing a macroscopic parameter depending on need to get the distribution of density of states utilizing the variation method, which is significant for the development of a society. In addition, we calculate a simple economic system as an example, indicating that the system occupied mostly by the middle class could develop stably and soundly, explaining the reason for resulting distributions of macroscopic parameters.
Punctuated Equilibrium and Power Law in Economic Dynamics
Thurner { \it et al.}最近提出了一个有趣的熊彼特经济动力学玩具模型。经济学家约瑟夫·熊彼特的观点。间断的平衡动力学被证明是从这个模型中出现的，并且对时间序列的一些详细分析表明SOC类行为。在目前的工作重点是折腾的想法是否动力学真的可以像一个自组织临界（SOC）类型。这项研究表明，它是必要的，以获得幂律，从而SOC的行为，在这样一个模型中的生物进化模型线的“健身”和“选择”的概念。
