Final answer:
The decisions by one judge that are followed by others create legal precedents under the principle of stare decisis, conferring continuity and predictability to the legal system.
Step-by-step explanation:
When one judge made a decision and it was considered a good one, leading other judges to follow his decisions, what these decisions established are known as legal precedents. Legal precedents are formed under the doctrine of stare decisis, which means 'to stand by things decided' in Latin. This concept is crucial in the common law system of the United States, where consistency and continuity of the law are upheld through adherence to past rulings. By doing so, the courts ensure greater certainty and stability in the interpretation of laws.
Furthermore, such decisions often become ways in which policy is legitimately made and how justice is served. They guide judges in making rulings in future cases that are factually similar to previous ones. This adherence to precedent ensures an even-handed administration of justice and contributes to the solidity and legitimacy of the court system. Occasionally, as societal norms and the composition of the courts change, legal interpretations and precedents may evolve, permitting the law to adapt to new circumstances.