
Common law is a body of unwritten laws based on legal precedents established by the courts. It is one of the two main legal systems used today, the other being civil law. Common law is often traced back to England during the Middle Ages and is still used in several countries today, including the US, Canada, India, and Australia. It is flexible and can respond to changes in society, as higher courts can overrule prior decisions without waiting for lawmakers. Common law draws from judicial opinions, interpretations, and public juries, and relies on caselaw and precedent to guide decisions.
| Characteristics | Values |
|---|---|
| Definition | A body of unwritten laws based on legal precedents established by the courts |
| Basis | Court decisions, not codes or statutes |
| Sources | Custom, legal writings, previous court decisions |
| Flexibility | Can respond to changes in society |
| Stability and consistency | Based on previous caselaw, not subjective viewpoints |
| Binding | Precedent is binding, unlike in civil law systems |
| Judicial precedent | Places great weight on precedent |
| Legislation | Can inspire new legislation |
| Rulings | Based on majority rule across states |
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What You'll Learn

Common law vs civil law
Common law and civil law are the two main legal systems used today throughout the world. The former 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 originated in medieval England and is practised today in several countries, including the US, Canada, India, and Australia.
Common law is described as flexible since it can respond to changes in society. It does not require lawmakers to pass changes in statutes and codes. Instead, higher courts can overrule prior decisions as "bad law" without needing to wait for lawmakers to do so. When it comes to common law, the first thing to consider is often earlier court rulings and decisions. This means that to understand what may be binding, one must first know how similar situations have been handled in the past.
Civil law, on the other hand, is a comprehensive, codified set of legal statutes created by legislators. It is rooted in the Roman Empire and was comprehensively codified and disseminated starting in the 19th century, with France's Napoleonic Code and Germany's Bürgerliches Gesetzbuch. Civil law is the world's most common legal system, practised in about 150 countries. It centres around a comprehensive code of statutes that clearly outline everything from the procedures for handling claims to the punishment for offences. Civil law systems have clear rules for how judges need to rule for specific disputes.
Unlike common law systems, civil law court decisions are not binding in other cases, even if the facts are similar. Civil law judges tend to give less weight to judicial precedent. For example, the Napoleonic Code expressly forbade French judges from pronouncing general principles of law. In some civil law jurisdictions, the judiciary does not have the authority to invalidate legislative provisions.
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Common law and precedent
Common law is a body of unwritten laws based on legal precedents established by the courts. It draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law, also known as case law, relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a specific case. The judge presiding over a case determines which precedents apply to that particular case.
Common law legal systems can be traced back many centuries. The system as we know it started in England during the Middle Ages. Today, several countries around the world, including the US, Canada, India, and Australia, rely heavily on common law when resolving legal disputes.
Common law is often contrasted with civil law. While common law systems rely on case law and legal precedent to guide their decisions, civil law systems rely primarily on codes and statutes. Civil law centres around a comprehensive code of statutes that outline procedures for handling claims and punishments for offences. Civil law systems have clear rules for how judges need to rule in specific disputes. Unlike common law systems, civil law court decisions are not binding in other cases, even if the facts are similar.
Common law has been described as flexible since it can respond to changes in society. Higher courts can overrule prior decisions as "bad law" without needing lawmakers to pass changes in statutes and codes. In common law legal systems, it is important to look at earlier court rulings and decisions to understand what may be binding. This involves searching for relevant case law or legal precedent.
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Common law in the US
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It is a system of law that can be traced back to England during the Middle Ages and is now used in several countries, including the US, Canada, India, and Australia. Common law draws from institutionalised opinions and interpretations from judicial authorities and public juries. It is flexible and can respond to changes in society.
In the US, common law is a part of the country's legal system that evolved from British traditions during the 17th and 18th centuries. It is a system of law that relies on caselaw and legal precedent to guide decisions, rather than codes or statutes. This means that judges in common law systems need to follow earlier decisions and rulings, known as stare decisis, when dealing with similar cases. The principle of stare decisis holds that prior court decisions interpreting a statute are precedent and therefore binding. This is in contrast to civil law systems, where a judge's decision is not binding in future cases with similar facts.
Common law promotes stability and consistency because everyone involved knows that the outcome will be based on previous caselaw rather than subjective viewpoints. It is also flexible, as higher courts can overrule prior decisions as "bad law" without waiting for lawmakers to pass changes in statutes. This flexibility allows common law to adapt to new trends in political, legal, and social philosophy over time.
While common law is a significant part of the US legal system, the term itself is not commonly used in modern US legal discourse except in a historical sense, such as when referring to "English common law". However, the principles of common law continue to influence the US legal system and the decision-making process in unusual cases where existing statutes or written rules of law do not provide clear guidance.
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Common law in the UK
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It is a system that can be traced back to England during the Middle Ages. Common law draws from institutionalised opinions and interpretations from judicial authorities and public juries. It is often contrasted with civil law, which relies primarily on codes and statutes. Common law systems place a great deal of weight on precedent, whereas civil law judges tend to give less weight to judicial precedent.
In the UK, common law covers a range of matters, including murder and theft, and has sources in custom, legal writings, and previous court decisions. The legal writings used, known as Institutional Texts, are mostly from the 17th, 18th, and 19th centuries. An example of a relevant Institutional Text is 'The Institutions of the Law of Scotland' by Stair in 1681.
Common law is flexible and can respond to changes in society. It does not require lawmakers to pass changes in statutes and codes, which can be time-consuming or may never happen. Instead, higher courts can overrule prior decisions as "bad law" without waiting for lawmakers to act. This means that the common law evolves through a series of gradual steps, allowing the law to change substantially over time without sharp breaks, reducing disruption.
In common law legal systems, the evaluation of future cases is based on previous caselaw and judicial decisions, known as stare decisis. This Latin phrase roughly translates to "to stand by things decided". It is a principle that promotes stability and consistency, as it ensures that the ultimate outcome will be based on previous caselaw rather than subjective viewpoints.
In summary, common law in the UK is a system of law based on legal precedents and previous court decisions. It covers a range of matters, including criminal cases such as murder and theft, and is known for its flexibility and ability to adapt to changes in society.
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Common law marriage
Common-law marriage, also known as non-ceremonial marriage, informal marriage, or marriage by habit and repute, is a marriage that occurs outside of a statutorily defined process. In other words, it is a marriage that takes legal effect without a marriage license or ceremony.
Common-law marriage is recognised in seven US states and the District of Columbia, and nine other states recognise it with some restrictions. It is also recognised in Canada, although couples are not legally considered married and may instead be defined as "unmarried spouses". In the UK, 51% of respondents to a 2008 poll incorrectly believed that cohabitants had the same rights as married couples. Common-law marriage does not exist in Scotland, although there was a type of irregular marriage called 'marriage by cohabitation with habit and repute' until 2006. In England and Wales, common-law marriage was abolished by the Clandestine Marriages Act of 1753, which required marriages to be performed by the Church of England.
To be considered a common-law marriage, couples generally need to meet certain requirements. Both partners must have the legal capacity to marry, which usually means being at least 18 years old, of sound mind, and not already married to other people. They must intend to be married and hold themselves out to friends, family, and the public as being married. This can include referring to each other in public as "partner", "spouse", etc., or taking the same last name. There is no statutory requirement for the length of time a couple needs to live together, but generally, the longer they live together, the stronger their case is for common-law marriage.
In summary, common-law marriage is a legal recognition of a marriage that occurs outside of the typical statutory requirements, such as a marriage license or ceremony. While it is not recognised in all jurisdictions, couples in a common-law marriage may have the same rights as a married couple who went through a formal marriage process.
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Frequently asked questions
Common law is a body of unwritten laws based on legal precedents established by the courts. It draws from institutionalized opinions and interpretations from judicial authorities and public juries.
Civil law is a comprehensive, codified set of legal statutes created by legislators. Civil law systems rely primarily on codes and statutes, whereas common law systems rely on caselaw and legal precedent to guide their decisions.
Common law promotes stability and consistency because everyone involved knows that the ultimate outcome will be based on previous caselaw and not on subjective, personal viewpoints. It is also flexible and can respond to changes in society.
Common law is practiced in several countries, including the US, Canada, India, Australia, Hong Kong, New Zealand, and the United Kingdom.
Common law relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a specific case. The judge presiding over a case determines which precedents apply to that particular case.
















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