AGGLOMERATION, TRADE, AND SPATIAL DEVELOPMENT: BRINGING DYNAMICS BACK IN
指出空间经济学在理论化和测量集聚效应、贸易成本及城市化方面取得巨大进展，但模型假设存在问题，需进一步建立因果关系并解释空间经济动态。
ABSTRACT The field of spatial economics has made enormous progress in theorizing and measuring agglomeration effects, trade costs, and urbanization. Typical models establish structural determinants by making strong assumptions about which forces are relevant and how these forces interact. But many of these assumptions, about firms, agents, spatial costs, and market structures, are questionable. As a result, the field has a long way to go to establish causality, and to be able to account for spatial economic dynamics.