Research on Co-agglomeration mechanism of producer service industry and its spatial effect Development mechanism of producer services industry for metropolises Research on development of producer services industry and growth of regional economy Research on the green collaborative evolution of productive service industry and manufacturing industry Research on the mechanism of producer service industry for the strategic emerging industry Study on international transfer of service industry and its spillover effects 并列题名：Development mechanism of producer services industry for metropolises research on development of modem service industry in Jiangxi province