In this paper I examine agglomeration effects on the intensity of local knowledge transfers from universities to high technology innovations within the modified Griliches-Jaffe knowledge production function framework. Estimations are carried out at the level of U.S. metropolitan areas....

Spatial interaction models of the gravity type are widely used to model origin-destination flows. They draw attention to three types of variables to explain variation in spatial interactions across geographic space: variables that characterize an origin region of a flow, variables that...

In this paper we present a formal analysis that incorporates returns to transportation into a Ricardian framework to predict trade patterns. The important point gained from this analysis is that increasing returns to transportation, coupled with appropriate distances between trading partners,...