The European debt crisis sparked a debate on how the EU and EMU should integrate financially. Some think a common currency needs closer fiscal and political unity to survive, but this isn't always true for other monetary unions. The EU already has some fiscal union elements in place. Centralizing tasks like financial supervision and defense at the Union level could benefit all of Europe. Any fiscal integration should be based on solid fiscal discipline. Bailing out troubled governments since 2010 has replaced the 'no bail out' rule, which could lead to a dysfunctional fiscal union.