大都市圈通常是指由若干城市集聚而成的高密度经济区域,在空间上表现为由大运量的高速通道联结的、庞大的、多核心、多层次的城市群。在这个空间里,由于集聚形成的规模经济和范围经济,生产和服务的交易成本、运营成本和管理成本大大降低,投资回报率和要素收益率明显提高。经济活动的高度密集和在空间上的压缩,使得大都市圈往往成为一个国家或区域的经济核心区和增长极,成为经济发展最具活力和竞争力的地区。我国目前已形成若干大都市圈的雏形,但发育比较成熟的还是长三角、珠三角和京 The metropolitan area usually refers to a high-density economic area formed by the agglomeration of several cities, which is spatially manifested as a large, multi-core and multi-level urban agglomeration linked by a large number of high-speed corridors. In this space, the return on investment and the rate of factor return have been significantly increased due to the economies of scale and scope in which the agglomerations are formed, the transaction costs of production and services, and the significant reduction in operating and management costs. The highly intensive and space-constrained economic activities make the metropolitan area often become the economic core and the growth pole of a country or region and become the most dynamic and competitive region for economic development. At present, China has formed a prototype of a number of metropolitan areas, but it is still relatively mature in the Yangtze River Delta, Pearl River Delta and Beijing