The situation reminds me of a short story by Franz Kafka, Before the Law, where a man tries to seek entrance to a courthouse. A door keeper tells him that this is possible in principle, but not at the moment.The man spends his entire life in front of the court waiting to be admitted. At the end of his life he was told that he could have gone through the door at any time. That man followed the wrong set of rules — rules of the mind, not of the law.Rules of the mind is what we are dealing with in the European debate about the single currency. Many of these rules either do not exist, or they constitute some rather far-fetched interpretation of existing rules.