The workshop will discuss the currently ongoing entrerprise of drafting a European Contract Law. Using an economic perspective, it will discuss the desirability of a body of rules at supra-national level, in the presence of existing national ontract law systems. Using an economic method can be of help at the core of European Contract Law, to identify its function(s) and to provide guidance as to the appropriateness of the rules set to become part of it. Such guidance includes both suggestions as to the appropriate regulatory level, going beyond the incomplete cross-border transaction costs argument, as well as indications as to what constitutes contract law of good quality.