
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. Common law is a system of law that has been administered by the courts of England since the Middle Ages and has evolved into the legal systems found in the United States and most Commonwealth countries. Common law is applied in areas such as bankruptcy, intellectual property, antitrust, banking regulation, securities, and tax law. It is also used in proceedings before U.S. federal and state agencies, and in common-law marriages, where couples are considered married without formally registering their union. Common law is flexible and adaptable, promoting stability and consistency in legal systems.
| Characteristics | Values |
|---|---|
| Type of legal system | Common law |
| Basis | Precedent, also known as stare decisis |
| Sources of law | Judicial decisions, public juries, and court opinions |
| Flexibility | High, can respond to changes in society |
| Adaptability | Can address situations not predicted by lawmakers |
| Stability and consistency | High, as decisions are based on previous case law |
| Efficiency | High, as judges only follow precedent |
| Countries | US, Canada, India, Australia, England, Wales, Ireland, Scotland, Northern Ireland, and most Commonwealth countries |
| Influence | The legal system in the US and most Commonwealth countries evolved from common law |
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What You'll Learn

Marriage
Common-law marriage is a legal status that arises from the nature of a couple's relationship rather than a marriage certificate or a civil or religious ceremony. Common-law marriage is a concept that has been around for many years, but it is not recognized in all states or countries.
In the United States, common-law marriage has existed since colonial times when America was a colony of England. The first American colonies were subject to English rule, but Acts of Parliament did not apply to the colonies unless they were specifically mentioned. The Clandestine Marriages Act of 1753 ended common-law marriages in England and Wales, requiring couples to marry in the Church of England. However, this did not apply to the American colonies, and common-law marriage survived in what is now the United States and Canada. Today, common-law marriage is recognized in some U.S. states, including Colorado, and the District of Columbia, but not in others, such as California.
To be considered a common-law marriage, couples must generally meet certain requirements, although these vary from state to state. Some of the common requirements include:
- Living together for a consistent period, such as seven or ten years (although there is no statutory requirement for the length of time).
- Holding themselves out to friends, family, and the community as a married couple, such as by referring to each other as "husband" or "wife" and using the same last name.
- Maintaining joint finances, such as leases, mortgages, bank accounts, and credit cards.
- Both partners must have the legal capacity to marry, including meeting the minimum age requirement (usually 18 years old) and being of sound mind.
- Neither partner can be married to anyone else.
Couples in a common-law marriage may enjoy many of the same benefits as legally married couples, such as tax exemptions, spousal Social Security benefits, and medical benefits. However, they must file for divorce if they want to separate, just like married couples.
In other parts of the world, such as England, Wales, and Scotland, the term "common-law marriage" may be used socially to refer to unmarried, cohabiting heterosexual couples. However, this does not confer the same rights and obligations as legal marriage or civil partnerships.
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Commercial law
Common law is prevalent in countries that were former British colonies or protectorates, including the United States, Australia, Canada, Hong Kong, India, New Zealand, and the United Kingdom. In these countries, common law principles are applied in commercial law to guide contractual relationships and business transactions.
Commercial contracts often include a "choice of law clause" to provide certainty and predictability. Interestingly, many international contracts choose the law of New York or Delaware, even when the connection to these states is tenuous. This is due to the depth and predictability of New York's commercial law history and Delaware's comprehensive body of law on corporate issues.
In the United States, the Uniform Commercial Code (UCC) is a notable example of the application of common law principles in commercial law. The UCC is a universally adopted state law that governs all commercial transactions. It provides a consistent framework for businesses to enter into contracts with confidence that the terms will be enforced similarly across all American jurisdictions.
Additionally, common law's emphasis on precedent and interpretation allows for flexibility in commercial law. For instance, in the area of infrastructure, a government under a common law system may enact specific legislation to protect citizens' interests, such as prohibiting utility service providers from disconnecting supply to customers who are unable to pay.
In summary, common law principles are applied in commercial law, particularly in countries with a history of British influence. Commercial law under common law systems values predictability and consistency in contractual relationships, while also allowing for flexibility and adaptation to novel situations through judicial interpretation and precedent.
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Bankruptcy
In the United States, bankruptcy law is contained in Title 11 of the U.S. Code, also known as the Bankruptcy Code. The Bankruptcy Code outlines different bankruptcy types for various situations. Chapters 7 and 13 are the most common types available to individuals, while Chapter 11 bankruptcy is the most comprehensive chapter and is available to individuals and corporations. Chapter 9 bankruptcy is similar to Chapter 11 but applies to municipalities, while Chapter 12 bankruptcy is designed specifically for farms and fisheries. Chapter 15 bankruptcy deals with cross-border insolvency cases.
In the UK, bankruptcy is one way for individuals to deal with debts they cannot pay, but it does not apply to companies or partnerships. A bankruptcy order can be made if an individual cannot pay what they owe and wants to declare themselves bankrupt, if their creditors apply to make them bankrupt because they owe them £5000 or more, or if an insolvency practitioner makes them bankrupt because they have broken the terms of an individual voluntary arrangement (IVA).
The bankruptcy process is complex and relies on legal concepts like the “automatic stay” (which halts creditors from pursuing collection actions against the debtor), “discharge” (which releases the debtor from personal liability for certain debts), “exemptions” (which protect certain essential assets from liquidation), and "assume".
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Intellectual property
Common law is a body of unwritten laws based on legal precedents that may guide court rulings when the outcome is undetermined based on written rules of law. Common law is applied in instances where the outcome of a case or dispute cannot be conclusively determined by referencing an official law. Common law is increasingly being adopted in areas such as intellectual property.
Trademarks are the only type of IP that receives protection through common law. A business may acquire a common law trademark by using a certain logo, business name, or tagline. Common law trademark rights go to the business that uses the trademark first, and these rights can only be enforced in the specific geographic area where the trademark is used, as well as any areas where it could "reasonably expand". It is important to note that it is the responsibility of the business owner to enforce their common law rights.
In contrast, copyrights and patents must be registered and maintained. Otherwise, the IP may enter the public domain, where anyone can access the trade secrets. When work enters the public domain, it is no longer protected by intellectual property laws.
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Criminal law
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 promotes stability and consistency in the legal justice system. In common law, there is no official legal code that can be applied to a case. Instead, judges rely on previous decisions and rulings to determine the outcome of a case. While common law is distinct from criminal law, it can still influence criminal law procedures and outcomes in certain jurisdictions.
In the United States, for example, criminal procedure has become a constitutional matter, with federal common law sometimes overriding state law. The USA PATRIOT Act (2001) expanded the search and surveillance powers of law enforcement agencies, allowing them to monitor telephone and electronic communications without probable cause. This is an example of how common law can directly impact criminal law and shape law enforcement practices.
In Canada, the Dominion Criminal Code covers major crimes, and provincial laws such as the Ontario Human Rights Code also play a role. India has an overriding Bill of Rights that influences criminal law. These countries, along with the United States and Australia, continue to rely on common law principles when resolving legal disputes, including criminal matters.
In the United Kingdom, the modern law of negligence in England, Scotland, Wales, and Northern Ireland is based on Donoghue v Stevenson, a case that originated in Scotland. While Scotland maintains a separate criminal law system, the shared Supreme Court for civil cases influences criminal law across the UK. For example, the Supreme Court's decisions on wiretapping and electronic monitoring have set precedents for when such measures are permitted in criminal investigations.
In summary, while common law is not directly applied in criminal law, it influences criminal law procedures and outcomes in common law jurisdictions. It provides a framework for legal precedents, stability, and flexibility, allowing higher courts to overrule outdated decisions and adapt to societal changes.
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Frequently asked questions
Common law is used in countries that were former British colonies or protectorates, including the United States, Canada, India, and Australia. It is also used in most Commonwealth countries.
Common law is based on court decisions and judicial opinions, rather than codes or statutes. It relies on detailed records of similar situations and statutes.
In the US, federal common law is limited to specific jurisdictions stated in the Constitution, such as admiralty. The US Supreme Court has held that federal courts can hear cases between parties from different states and apply federal common law rules.
Civil law is a comprehensive set of legal statutes created by legislators, while common law is a body of unwritten laws based on judicial precedents. Civil law clearly defines the cases, procedures, and punishments, whereas common law is more flexible and can address situations not predicted by lawmakers.
Common law can be applied to unusual cases where there is no existing statute or written rule. It can also influence new legislation and shape future rulings. For example, common law marriage allows couples to be considered married without a formal registration.




































