In England and Wales the courts operate a very rigid doctrine of precedent which has the effect that every court is bound by the decisions made by courts above it in the hierarchy and in general courts are bound by their own past decisions.
The doctrine of Precedent is the process whereby judges should follow previous decisions in similar cases to help maintain a degree of consistency in the way the law is applied in similar cases. It is based on the maxim “stare decisis” which means stand by what has been decided.
The Ratio Decidendi (reasons for deciding) is the binding part of a judge’s decision but how judges interpret this can vary thus changing the impact it can have on future decisions.
The obiter dicta (things said by the way) though not binding can still be used as persuasive precedent and so a judges influence can extend beyond that provided by the rules of precedent.
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