Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This article argues that the introduction of spatial interactions to model the determinants of origin-destination (OD) flows can potentially result in <italic>excessive</italic> contiguity. To explain flows between OD regions, it is not only what happens in the origin and destination that is relevant, but also what happens in their neighbouring regions. However, what happens if there is a high degree of overlap between origin neighbouring areas and destination neighbouring areas? The article presents an empirical illustration to re-examine the evidence presented in previous research (Alam᭓abater <italic>et al.</italic>, 2013) and more closely analyses the territorial level, focusing on the case of interregional trade of goods at the NUTS3 level (Spanish provinces). We then use two different methodologies within the framework of a spatial gravity equation for interregional trade modelling. The findings confirm the importance of spatial dependence on trade flows and in particular that logistics decisions within a province affect shipments from contiguous provinces.