Traditional choice of law theory conceives of certainty and flexibility as opposed values: increase one, and you inevitably decrease the other. This article challenges the received wisdom by reconceptualizing the distinction. Rather than caring about certainty or flexibility for their own sake, it suggests, we care about them because each makes it easier to promote a certain cluster of values. And while there may be a necessary tradeoff between certainty and flexibility, there is no necessary tradeoff between the clusters of values. It is possible to improve a choice of law system with regard to both of them. The article demonstrates how this has happened in the history of choice of law and how it can be accomplished in the future.
Roosevelt, Kermit, Certainty vs Flexibility in the Conflict of Laws (December 12, 2018) in The Continuing Relevance of Private International Law and Its Challenges (F Ferrari and D Fernandez Arroyo eds, Elgar, forthcoming 2019); U of Penn Law School, Public Law Research Paper No 18-40.