Cuniberti on Lex Mercatoria


I (University of Luxembourg) have posted Three Theories of Lex Mercatoria on SSRN.

One of the most remarkable developments in international commercial law over the last fifty years has been the gradual acceptance of the existence of a new merchant ‘law’, or lex mercatoria, spontaneously generated by the international community in the shadow of national legal orders. While the notion that there might be law beyond the state aroused the interest of legal scholars and theorists around the world, few wondered whether international commercial actors had a genuine interest in the development of an autonomous transnational law. This Article offers empirical evidence suggesting that commercial parties almost never opt into lex mercatoria pursuant to their freedom to contract, but instead use that freedom to select a particular national law to govern their contracts. This conclusion begs the question of whether anybody else might benefit from lex mercatoria.

In a groundbreaking article published in 2005, Christopher Drahozal argued that the idea had lost practical significance and offered a signaling theory of lex mercatoria: the interest in the idea can be explained by the willingness of would be arbitrators to market themselves. While essentially agreeing with Drahozal, this Article offers two other theories explaining the development of lex mercatoria. First, I argue that deciding disputes on the basis of lex mercatoria can bring important benefits to international arbitrators. If that is the case, though, their interests may conflict with that of the parties who hired them. That raises an agency problem which needs to be both acknowledged and addressed. Secondly, I demonstrate how lex mercatoria can also benefit organizations which are involved in the business of producing model contracts and maintain that the active promotion of the use of non-state law – thereby side-stepping mandatory rules of national law – is intended to reduce the costs of producing international model contracts by such organizations.

The article is forthcoming in the Columbia Journal of Transnational Law.