In 1945 , a test program began in the middle western state of michigan 1945年，在密歇根州中西部地区开始了一项测试调查。
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Then , the conditions and reasons of the institutions disequilibrium are approached . what is more , the system innovation is discussed through the combination of three successful models in zone development , in order to offer references to the model of system innovation in middle western area 论文还结合东部涌现的三大成功的经济发展模式的介绍，对城镇化制度创新与经济发展模式的相互关系进行了摸索，力求为中西部制度创新模式的摸索提供参考。
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