
Common law is a body of unwritten laws based on legal precedents established by the courts. It is a system of law that is derived from judicial decisions instead of from statutes. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It is often the case that judges create common law when they decide cases. The US Supreme Court and state supreme courts create most of the common law, and federal and state appellate courts also create common law if an issue has not yet been decided by their supreme court. Common law is flexible and adaptable to unforeseen situations, as it can respond to changes in society.
| Characteristics | Values |
|---|---|
| Basis of common law | Legal precedents |
| Nature of common law | Unwritten laws |
| Common law systems | Dual system of common and civil law |
| Common law in practice | United States, United Kingdom, Australia, Canada, Hong Kong, India, New Zealand |
| Common law courts | Federal and state appellate courts |
| Common law marriage | Acknowledges similar rights to married couples who are not officially married |
| Common law vs civil law | Common law is flexible, civil law has clear rules |
| Common law decisions | Published online, older decisions are in books available in law libraries |
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What You'll Learn

Common law is a body of unwritten laws
The form of reasoning used in common law is known as casuistry or case-based reasoning. Common law places an emphasis on precedent while allowing some freedom for interpretation. The value of a common-law system is its adaptability to situations that were not contemplated at the time by the legislature.
The concept of common-law marriage, which acknowledges similar rights as those with a marriage license to couples that are not officially married if certain conditions are met, is an example of common law in action today. Common law originated in medieval England, but today both the US and UK operate under a dual system of both common and civil law. Common law is also practiced in Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom.
The English Court of Common Pleas was established after the Magna Carta in 1215 to try lawsuits between commoners in which the monarch had no interest. Judge-made common law was the primary source of law for several hundred years, before Parliament acquired legislative powers to create statutory law.
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Common law is based on legal precedents
Common law is a body of unwritten laws based on legal precedents. It is a system of law that is derived from judicial decisions and opinions rather than from statutes. Common law is flexible and adaptable, allowing courts to address situations not originally contemplated or predicted by lawmakers. It is based on the principle of stare decisis, which means "to stand by things decided". In practice, this means that judges in common law systems need only follow precedent when making decisions, looking at past rulings and caselaw when dealing with similar cases. This allows for consistent outcomes by applying the same standards of interpretation.
Common law was first established in England, with the first extant record of a common law court case published in 1268. After the American Revolution in 1776, the newly formed American states often looked to these English common law reports as a basis for their own common law. Today, the US operates under a dual system of both common and civil law, with every state except Louisiana having a common law legal system. Common law is also practised in Canada, the UK, Australia, New Zealand, India, and Hong Kong.
The US Supreme Court and state supreme courts create most of the common law by deciding cases and writing opinions explaining their decisions. Federal and state appellate courts also create common law when their supreme court has not yet ruled on an issue. Common law is particularly useful in areas of law where there are no written rules, such as negligence and contracts. For example, determining which driver is responsible for damages caused by a car accident is usually resolved using the common law principles of negligence.
Common law is also flexible in that it can adapt to changes in society, and higher courts can overrule prior decisions as "bad law" without needing to wait for lawmakers to act. This adaptability is a strength of common law systems, allowing for more efficient and wealth-creating commercial contracts, as parties can predict whether a proposed course of action is likely to be lawful.
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Common law is established by the courts
Common law is a body of unwritten laws based on legal precedents established by the courts. It is a system of law that draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law is often established in civil cases, as a means of compensating someone for wrongful acts, known as torts, and for regulating contracts.
The form of reasoning used in common law is known as casuistry or case-based reasoning. It is a flexible system, as it can respond to changes in society. Common law is adapted to situations unforeseen or uncontemplated by lawmakers, and higher courts can overrule prior decisions without waiting for lawmakers to act.
The concept of common law was first established by King Henry II in 1154, who created a unified system of law "common" to the country, ending local control and variations in law from region to region. The English Court of Common Pleas was established after the Magna Carta in 1215 to try lawsuits between commoners in which the monarch had no interest. The early development of case law in the 13th century led to the yearly compilations of court cases known as Year Books, which are a principal source for knowledge of the developing legal doctrines and concepts of the time.
Today, the US operates under a dual system of both common and civil law. Common law is also practiced in Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom.
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Common law is flexible and adaptable
Common law is a body of unwritten laws based on legal precedents established by the courts. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law is flexible and adaptable in several ways.
Firstly, common law is flexible because it can respond to changes in society. Unlike civil law systems, common law does not require lawmakers to pass changes in statutes and codes, which can be a lengthy process or may never happen. In common law, higher courts can overrule prior decisions without waiting for lawmakers to act, allowing for a more dynamic and responsive legal system.
Secondly, common law is adaptable to unforeseen situations. When lawmakers create statutes, they cannot anticipate all the scenarios in which courts may need to apply the laws. Common law systems address this challenge by allowing courts to handle situations not originally contemplated by lawmakers. This adaptability is a significant advantage of common law, as it provides a mechanism to navigate unforeseen circumstances and ensure that justice can still be served.
Thirdly, common law allows for some freedom of interpretation. While placing an emphasis on precedent, common law also enables judges to interpret and apply the law to the specific circumstances of each case. This flexibility is particularly valuable as technology and societal norms evolve, ensuring that the law can adapt to new contexts and situations that may not have been foreseen when the original statutes were created.
Lastly, common law is adaptable in that it can inspire and lead to new legislation. As common law draws from judicial opinions and interpretations, it can highlight areas where existing laws may be insufficient or outdated. This, in turn, can prompt the enactment of new legislation to address these gaps or changes in societal norms.
In conclusion, common law is a flexible and adaptable legal system that can respond to societal changes, address unforeseen situations, allow for interpretation, and influence new legislation. These characteristics contribute to its continued relevance and effectiveness in various countries around the world, including the United States, Canada, India, and Australia.
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Common law is case-based reasoning
Common law is a body of unwritten laws based on legal precedents established by the courts. It is a form of case-based reasoning or casuistry, where judges create laws when they decide cases. These decisions are then used as precedents for future cases with similar circumstances. The common law system is adaptable and flexible, allowing courts to address situations not originally contemplated by lawmakers. It also provides reasonably precise guidance on most issues, allowing parties to predict the lawfulness of their actions and assuring consistency in decision-making.
The common law system originated in England, with the first state reports published in Massachusetts after the American Revolution in 1776. The English Court of Common Pleas was established after the Magna Carta in 1215 to try lawsuits between commoners. Over time, judge-made common law became the primary source of law for several hundred years, with yearly compilations of court cases known as Year Books. Common law then spread to North America during the colonial period, and today, the US operates under a dual system of common and civil law.
In the US, the Supreme Court and state supreme courts create most of the common law by deciding cases and writing opinions. Federal and state appellate courts also create common law when their supreme court has not yet ruled on an issue. While civil law centres around a comprehensive code of statutes, common law is based on court decisions and judicial opinions. It draws from institutionalized interpretations from judicial authorities and public juries, aiming to establish consistent outcomes by applying uniform standards.
The principle of stare decisis, a Latin phrase meaning "to stand by things decided", is central to common law. It refers to the practice of following earlier court decisions and rulings when dealing with similar cases. This precedent set by higher courts is typically binding on lower courts in the same jurisdiction. However, higher courts can overrule prior decisions as "bad law" without waiting for lawmakers to act, which is a significant difference from civil law systems.
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Frequently asked questions
Common law is a body of unwritten laws based on legal precedents established by the courts. It is distinct from criminal law and is used in civil cases to compensate someone for wrongful acts known as torts.
The U.S. Supreme Court and state supreme courts create most of the common law by deciding cases and writing opinions explaining their decisions. Federal and state appellate courts also create common law when their supreme court has not yet decided on an issue.
When judges use common law, they search for past decisions from similar cases. These past decisions are known as precedents. Trial judges follow these precedents to help ensure that the law is constant.
Common law can be used in cases involving negligence and contracts. For example, determining which driver is responsible for damages caused by a car accident is usually resolved using the common law principles of negligence.











































