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α: calibrated so average coauthorship-adjusted count equals average raw count
Although there is mounting empirical evidence that the mere presence of borders contribute to reduce trade significantly, there is no firm view on what are the reasons underlying this phenomenon. This paper investigates the role played by asymmetries in judicial systems in driving the "border effect". First, we provide evidence that differences in the judicial system matter for the volume of trade flows. Variables capturing the extent of asymmetries in the procedures to settle trade litigations perform significantly in estimation both across OECD countries and across French regions. Second, we develop a matching model of trade showing that such asymetries in the legal system fragment trade through a mechanism which is essentially different compared with that of transport costs or formal trade barriers.