[编者按]《美国经济社会发展的四大机制》是沙海林同志在美国学习培训后撰写的考察报告。一位访问学者在美国学习考察十个月，所收集的资料肯定权为丰厚。文章并不象常见的考察报告那样堆砌一大批枯燥的数据，也没有象“前卫”派那样玩弄“后现代”、“新古典”等等时髦概念， [Editor’s Note] The “Four Major Mechanisms for Economic and Social Development in the United States” is an inspection report written by Comrade Sha Hailin after studying and training in the United States. A visiting scholar studying in the United States for ten months, the data collected certainly affirmative. The articles do not pile up a large amount of boring data like the common inspection report, nor are they fashionable concepts like “avant-garde” or “neoclassical”