Principle 4: Single Undertaking
All WTO agreements are held together as a single undertaking. This means that member countries cannot selectively choose which agreement they will join. The WTO, and all of its agreements, is a single package that member states must join on an all or nothing basis.
Principle 5: Safety Valves
In certain circumstances, governments are allowed to restrict trade. For instance, under the Agreement on Safeguards, a country is allowed to restrict temporarily products from which a surge in imports caused or is threatening to cause serious injury to a specific domestic industry.