In this paper, we present a novel approach to measure domestic bilateral trade flows in intermediate and final consumption in the Italian regions. We reconstruct regional trade flows in final consumption by using administrative data from tax returns that limit the issues of survey-based measures. We also investigate the main determinants of domestic regional trade flows in Italy by adopting a spatial gravity modeling framework that allows for the inclusion of multiple spatial dependence effects. Moreover, we provide evidence of the presence of geographical heterogeneity and a specific focus on trade flows in the manufacturing sector. Our findings, which are robust to alternative specifications, suggest that the introduction of different sources of spatial dependence is relevant to understand the occurrence of multiple types of network effects when considering origin, destination, and origin–destination linkages in trade flows. We also document regional differences in the spatial concentration of trade flows in intermediate and final consumption. Finally, we discuss the main implications and future avenues of inquiry of our research.

在本文中，我们提出了一种新方法来衡量意大利地区中间和最终消费的国内双边贸易流量。我们利用纳税申报中的行政数据重建最终消费中的区域贸易流量，这些数据限制了基于调查的措施的问题。我们还通过采用允许包含多种空间依赖效应的空间引力模型框架来研究意大利国内区域贸易流动的主要决定因素。此外，我们提供了存在地理异质性的证据，并特别关注制造业的贸易流动。我们的研究结果对于替代规范来说是稳健的，表明，在考虑贸易流中的原产地、目的地以及原产地-目的地联系时，引入不同的空间依赖性来源有助于理解多种类型网络效应的发生。我们还记录了中间消费和最终消费贸易流空间集中度的区域差异。最后，我们讨论了我们研究的主要含义和未来的探究途径。