DYNAMICS OF CHANGING WORLD ECONOMIC STRUCTURE: U.S. ROLE AND INFLUENCE Xiao Lian（7） This article discusses the inherent dynamics of the changing world economic structure and gives an analysis based on three levels of competition, namely, enterprises, industries and state, which combine to influence the American standing in the new world structure. The continuity, the discontinuity, the discontinuous continuity and the differentiated acceleration of value chains are the basic points discussed in this essay.