Economic Causes of Forming Modern Central Business Districts

Central Business Districts(CBD) are existing in many metropolis around the world. This article analyses such phenomenon not only according to the development of the whole city.The CBD's forming and developing should be due to the separation in space of the enterprise internal division,which reflects the maturing of the third industry.CBD has its own rule and evolving procedure,in which the government definitely has a significant role, but not the only aspect to promote the CBD's form and development.