Research on the producer service agglomeration and resources misallocation improvement 并列题名：Research on the producer service agglomeration and resources misallocation improvement Research on producer services agglomeration and urban economic transformation and development research on the American vocational education movement Research on the impact of producer services agglomeration on manufacturing servitization Agglomeration of producer services, agglomeration of manufactures' innovation and R&D efficiency research on producer services and city economic sustainable development