经济是一切社会存在及历史发展的基础和原动力 ,社会经济在其不断的发展过程中 ,不仅分工越来越细 ,而且由于自然的和社会的原因 ,经济重心也发生着一定的转移。古代经济发展先后形成过两个中心。其中 ,黄河流域是中华民族的摇篮 ,是我国最早的经济中心。后来 ,随着历史的变迁 The economy is the foundation and driving force behind the existence and historical development of all societies. In the course of its continuous development, the social economy is not only more and more detailed in the division of labor, but also due to natural and social reasons, the economic center of gravity is also shifting. Ancient economic development has formed two centers. Among them, the Yellow River Basin is the cradle of the Chinese nation and is the earliest economic center in China. Later, with the historical changes