一、引言天津是我国北方最大的沿海开放城市,也是环渤海地区的经济中心。尤其在近年来,国家把发展环渤海经济圈作为中国经济发展的第三极,天津的经济增长日益成为经济学界关注的焦点。现代经济学的最新研究成 I. INTRODUCTION Tianjin is the largest coastal open city in northern China and an economic center of the Bohai Rim. Especially in recent years, the state has taken the development of the Bohai Economic Circle as the third pole of China’s economic development. The economic growth in Tianjin has increasingly become the focus of attention of economists. The latest research into modern economics