Tempora mutantur: in search of a new testament for NEG
回顾了克鲁格曼1991年提出的新经济地理学核心-边缘模型的局限性，指出在原有框架内难以取得突破性进展，并建议从异质性、城市、交通、公共政策和校准等方向拓展该领域。
The aim of this article is 2-fold. First, we briefly discuss the constraints associated with the canonical 'Cobb-Douglas—Dixit-Stiglitz-Spence—Samuelson' NEG setup originally used by Krugman in 1991. We outline the key features of his core-periphery (CP) model and highlight what results are robust to changes in functional forms and agglomeration mechanisms. We also selectively review the literature that amends the original CP model in various directions and discuss what qualitative insights do change. Our conclusion is that progress within the straightjacket of Krugman's original framework is unlikely to produce path-breaking new insights. Second, we suggest that there are potentially large payoffs to stepping outside of the established framework and to extend the NEG approach into various directions that have to date received only little attention. Heterogeneity, cities, transportation, public policy and calibration are avenues along which NEG needs to make progress.