Beyond exchange and agglomeration: resource flows and city environments as wellsprings of urban growth.

The conversation between economic geographers and political economists has not made much progress. The former focus on exchange, markets and efficiency, as can be seen in work on urban economies. We want the field to pay more attention to two processes crucial to the growth of cities often lying outside market exchange and agglomeration economies: how resources are managed across time and space and how the urban environment creates challenges demanding collective responses. We first make the case for the two processes using historical examples and then argue for the importance of similar processes today. We do not propose to make a definitive argument, but rather to challenge economic geographers with an expanded research agenda for the future. [ABSTRACT FROM AUTHOR]