
Common law, also known as judicial precedent, is a legal system primarily developed through judicial decisions rather than statutes. Judges in common law systems make decisions based on precedent, or rulings made in previous similar cases. This is known as stare decisis, a Latin term that means let the decision stand or to stand by things decided. The principle of stare decisis promotes consistency and predictability in the law by requiring judges to follow existing precedents, preventing arbitrary decision-making, and providing a framework for future rulings. While stare decisis is a foundational concept in common law systems, it is not inflexible, and judges may depart from precedent in certain circumstances.
| Characteristics | Values |
|---|---|
| Consistency and predictability | The law is more consistent and predictable, and less seemingly random. |
| Efficiency | It saves time and energy by preventing the judiciary from having to continually decide the same legal question or issue. |
| Fairness | It prevents bias and arbitrary decision-making. |
| Flexibility | Judges are empowered to resolve issues and establish new precedent in "cases of first impression" with no precedent or clear legislative guidance. |
| Binding precedent | Precedents are maintained over time through court records and historically documented in collections of case law (yearbooks and law reports). |
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What You'll Learn

Consistency and predictability
The principle of stare decisis gives weight to the idea that the law should be consistent and interpretations of the law should be predictable. By adhering to precedent, judges avoid arbitrary decision-making and ensure that similar cases are treated similarly, providing a sense of stability and fairness in the legal system. This is particularly important in vertical stare decisis, where higher court decisions take precedence over lower courts, establishing a clear hierarchy and consistency across the judicial system.
In the context of common law, precedent can be either binding or persuasive. Binding precedent refers to previous judicial decisions that must be followed, while persuasive precedent provides guidance that judges can consider but are not obligated to follow. This flexibility allows for the evolution of the law over time, as judges can adapt and refine precedents to fit changing societal needs and values.
The ratio decidendi, or the key factual element and line of reasoning behind a court decision, is crucial in establishing binding precedent. It forms the basis for future court decisions by providing a clear rationale that can be applied consistently in similar cases. This distinguishes ratio decidendi from obiter dicta, which are non-binding observations or comments made by judges that may still be cited as persuasive authority.
By following the principle of stare decisis, judges contribute to a consistent and predictable legal environment, ensuring that the law is applied fairly and justly. While there may be exceptions and nuances in how precedent is applied, stare decisis remains a fundamental concept in common law, shaping the decisions of judges and providing a sense of stability and continuity in the legal system.
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Judicial discretion
Judges play a crucial role in applying and interpreting precedent. They determine which precedents are relevant and how they should be applied to the facts of a new case. This involves examining the ratio decidendi, or the key factual elements and reasoning, of previous cases. Judges also have the power to distinguish between binding and persuasive precedents. Binding precedents are those that must be followed, while persuasive precedents can be considered but do not have to be followed. This distinction allows judges to exercise discretion in interpreting and applying the law, ensuring that the law can adapt to changing circumstances and societal developments.
For example, in the United States, the Supreme Court has the authority to overturn its own precedents. In Brown v. Board of Education (1954), the Court overturned the longstanding 'separate but equal' doctrine established in Plessy v. Ferguson (1893), recognising that segregation in education harmed African American children and denied them equal opportunities. This exercise of judicial discretion reflected a shift in societal values and interpretations of the Constitution, demonstrating the importance of judicial discretion in adapting the law to evolving contexts.
However, judicial discretion is not unlimited. The doctrine of stare decisis serves as a check on arbitrary decision-making, requiring judges to provide justifications for their rulings and explain deviations from precedent. This promotes transparency and accountability in the judicial process, ensuring that decisions are based on legal principles rather than personal biases.
In conclusion, judicial discretion is a critical component of the common law system, allowing judges to interpret and apply precedent while ensuring consistency and adaptability in the law. By balancing respect for precedent with the need for flexibility, judges contribute to a legal system that is both stable and responsive to societal changes.
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Efficiency
The principle of stare decisis, which translates from Latin to "let the decision stand", requires judges in common law to conform to decisions reached by previous courts. This gives the law consistency and makes interpretations of the law more predictable. Conformity to precedent is a distinctive means to advance the rule of law.
The practice of following precedent also helps to prevent the passage of time from altering the treatment of two disputes that are relevantly similar. For example, if a judge were to adjudicate two disputes that are legally the same but arise at different times, deciding the new case in conformity with the precedent would deliver consistent treatment.
Stare decisis lessens the need for subsequent litigation and saves the time and energy of the judiciary by preventing them from continually deciding the same legal question or issue if it has already been decided in another case. It also helps to prevent bias and arbitrary decision-making by requiring judges to follow existing precedents.
The disciplinary role of stare decisis is more effective when the proportion of conservative judges is higher, as deviations from the ex-ante optimal decision have more lasting consequences.
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Academic influence
The academic discourse surrounding the role of judges in common law is extensive. Notable writers such as A. V. Dicey, William Markby, Oliver Wendell Holmes, and John Austin have contributed to the evolution of the modern definition of common law, viewing it as "case law" or ratio decidendi, which serves as binding precedent. This academic influence has shaped the understanding and application of common law in legal systems worldwide.
The relationship between justice and courts is a complex topic that has been explored by scholars such as John Gardner and HLA Hart. Gardner asserts that judges should primarily administer justice, while Hart suggests that justice is administered according to the law. This ongoing debate influences how judges interpret and apply precedent in their decision-making process.
Kenneth Winston, another academic, offers insights into the complexities of subsuming facts within norms. He highlights that judges may refrain from applying a law to a case it clearly covers if there are unique features or unforeseen circumstances. This academic perspective provides judges with a framework for navigating the intricacies of precedent application.
Additionally, the academic discussion around the advantages and limitations of stare decisis is noteworthy. While it promotes consistency and predictability in legal interpretations, critics argue that rigid adherence to precedent may hinder the ability to adapt to societal changes and advancements. This critical analysis influences the evolution of legal systems and the ways in which judges interpret and apply precedent over time.
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Binding vs persuasive precedent
In common law, the doctrine of stare decisis dictates that judges are bound by the decisions of previous cases when deciding on future similar cases. This is known as precedent. Precedent can be divided into binding and persuasive categories.
Binding precedent refers to previous decisions that a court is required to follow when deciding on a similar case. These are usually decisions made by higher courts in the same jurisdiction. For example, in the US, all federal courts must follow the decisions of the US Supreme Court. Similarly, a federal circuit decision is binding on all federal district courts within its circuit, and a state's highest court is binding on all appeals and trial courts in that state.
On the other hand, persuasive precedent is not mandatory but can be used as a tool to find binding cases. Persuasive precedent can include decisions from other jurisdictions or lower courts. For example, if a lawyer is searching for a relevant case within their jurisdiction, they can use persuasive precedent from another jurisdiction to help locate a similar binding case within their own.
The distinction between binding and persuasive precedent is important because it determines the weight that a court will give to a previous decision. While binding precedent must be followed, persuasive precedent can be considered and may guide a court's decision, but it is not mandatory.
In summary, binding precedent refers to the mandatory following of previous decisions made by higher courts in the same jurisdiction, while persuasive precedent is non-mandatory and can include decisions from other jurisdictions or lower courts that may guide a court's decision.
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Frequently asked questions
Judges in common law decide by precedent to maintain consistency and predictability in law interpretation.
The Latin term for precedent is "stare decisis", which means "let the decision stand" or "to stand by things decided".
Stare decisis prevents bias and arbitrary decision-making by requiring judges to follow existing precedents. It also lessens the need for subsequent litigation, saving time and energy for the judiciary.
Yes, judges can deviate from stare decisis if there is a ""particular rationale" or "strong grounds" to do so. For example, if a precedent is considered "utterly wrong", a judge may choose to overturn it.
In a hierarchical court system, vertical stare decisis holds that the decisions of higher courts take precedence over the decisions of lower courts. Horizontal stare decisis, on the other hand, refers to the idea that prior decisions made by courts at the same appellate level should provide precedent for future cases at that level.









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