See Also
- Opting out, a similar concept in Canadian politics
- Nullification (U.S. Constitution), a related concept in United States politics
- Mechanism for Cooperation and Verification in the European Union
- Freedom of movement for workers
- Multi-speed Europe
Read more about this topic: Opt-outs In The European Union
Famous quotes containing the word see:
“For the gods, though slow to see, see well, whenever a man casting aside worship turns folly.”
—Sophocles (497–406/5 B.C.)