Not necessarily. The US Supreme Court sometimes issues per curiam opinions that are binding (on the instant case) but unsigned; however, these decisions do not set precedent for future cases.
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If more justices agree with a concurring opinion than with the opinion of the Court, the decision is called a plurality.
The Justices of the U.S. Court can reverse the decision of a lower court.
The Supreme Court's ruling is final and cannot be appealed. The United States Supreme Court consists of the Chief Justice of the United States and eight associate justices.
Supreme court justices decide if laws are constitutional.
Nine Justices Nine Justices make up the current Supreme Court: one Chief Justice and eight Associate Justices. There have been 103 Associate Justices in the Court's history.