Generally, neither the European courts nor the U.S. courts will interfere with a contract just because the value of the item in question has changed since the agreement.

European Courts

Judicial institutions in Europe, including the Court of Justice of the European Union and the European Court of Human Rights, which handle matters ranging from EU law to human rights issues.

U.S. Courts

Judicial institutions within the United States responsible for interpreting laws, resolving disputes, and administering justice at federal and state levels.