
Common law, also known as case law, is a body of law based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means to stand by things decided, where courts follow precedents established by previous decisions. Common law is derived from judicial decisions rather than statutes, and it is up to the presiding judge to determine which precedents to apply in each case. Common law is less prescriptive than civil law, and it is still very much in effect in the US and several other countries around the world. The value of a common-law system is that the law can be adapted to situations that were not contemplated at the time by the legislature. This flexibility allows common law to connect to and inform the resolution of current legal issues.
| Characteristics | Values |
|---|---|
| Definition | Common law is a body of law based on legal precedents established by the courts. |
| Basis | Common law is based on judicial decisions and rulings made in previous similar cases, rather than codes or statutes. |
| Adaptability | Common law can be adapted to situations that were not contemplated at the time by the legislature. |
| Consistency | Common law promotes stability and consistency in the legal system, as lower courts typically follow the precedents set by higher courts. |
| Flexibility | Lower courts can modify or deviate from precedents if they are outdated or if the current case differs significantly from the precedent case. |
| Influence | Common law influences the decision-making process in unusual cases where there is no applicable statute or written rule of law. |
| Sources | Common law relies on detailed records of similar situations and statutes due to the absence of an official legal code. |
| Commercial Systems | Common law contributes to robust commercial systems by providing guidance and predictability for commercial parties. |
| Contract Law | Common law emphasizes the freedom of contract, with fewer implied provisions, allowing parties to set out the terms of their contractual relationship. |
| Country-specific | Common law is prevalent in countries with a history as British colonies or protectorates, including the United States, Canada, India, and Australia. |
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What You'll Learn

Common law's influence on unusual cases
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means "to stand by things decided". In other words, common law relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a case. The presiding judge determines which precedents apply to a new case.
Common law influences the decision-making process in unusual cases where the outcome cannot be determined based on existing statutes or written rules of law. This is because common law is adaptable and can be applied to situations that were not contemplated at the time by the legislature. This adaptability means that common law can be used to resolve "cases of first impression", where there is no precedent or clear legislative guidance. In these instances, judges are empowered to establish a new precedent.
The common law system, as we know it, started in England during the Middle Ages. It was then spread to the British colonies, including North America, during the 17th and 18th centuries. Today, several countries continue to rely heavily on common law when resolving legal disputes, including the US, Canada, India, and Australia.
Common law has had a significant influence on unusual cases in these countries. For example, in the US, common law marriages, also known as non-ceremonial marriages, are a legal framework that allows couples to be considered married without having formally registered their union. While this is not common in the US, several states have statutes or allow for common law marriage if certain requirements are met.
In another example, the English common law system influenced American common law for several decades after independence. This influence can be seen in the case of Byrne v Boadle (1863), which first applied the res ipsa loquitur doctrine.
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Common law marriage
Common-law marriage, also known as non-ceremonial marriage, is a legal framework that may allow couples to be considered married without having formally registered their union as either a civil or religious marriage. Common-law marriage is recognised in seven US states and the District of Columbia, and nine other states recognise it with some restrictions.
The concept of common-law marriage grants similar rights to those with a marriage license to couples that are not officially married if several conditions are met. These conditions include the legal right or "capacity" to marry, which usually means that both partners must be at least 18 years old, of sound mind, and cannot already be married to other people. Another condition is cohabitation, where couples live together for a period of time, although there is no statutory requirement for the length of time. The longer a couple lives together, the stronger their case is for common-law marriage.
The final condition is intent, where both partners must intend to be married and behave as a married couple. This can include referring to each other in public as "partner", "spouse", or taking the same last name. In family law, common-law marriage is a legal and informal marriage, where the married couple never had a formal wedding ceremony and never obtained a marriage license or marriage certificate.
The origins of common-law marriage can be traced back to medieval Europe, where marriage came under the jurisdiction of canon law, which recognised a valid marriage when parties stated they took each other as husband and wife, even in the absence of any witnesses. In ancient Greece and Rome, marriages were private agreements between individuals and estates. Today, common-law marriages are still recognised in some countries, such as Canada, although the couples are legally defined as "unmarried spouses".
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Common law and contract law
In the United States, contract law is primarily governed by two sources: the Uniform Commercial Code (UCC) and the common law of contracts. While the former applies to transactions involving the sale of goods, the latter applies to contracts for services, real estate, insurance, and intangible assets. Common law also covers unilateral and bilateral contracts, which can be formed when there is an offer and acceptance, and there is consideration from both parties, mutual intent to form a legal relationship, legality in purpose, and capacity to contract.
The common law of contracts is largely based on the Restatement of Law, Second Contracts, published by the American Law Institute. It also includes judge-made laws and private laws, which are the terms of the agreement between the parties exchanging promises. The Uniform Commercial Code, on the other hand, is a body of statutory law that governs important categories of contracts, including the sale of goods and securities.
One of the key differences between the two is the definition of "acceptance." Common law follows the "Mirror Image Rule," requiring acceptance to be an exact replica of the offer's terms. In contrast, the UCC only considers changes that "materially" impact the contract. Common law also requires additional consideration for contract modification, whereas the UCC does not. Furthermore, the remedies for breach of contract differ between the two, with common law providing more flexible remedies, such as specific performance, compensatory damages, or remedies for unjust enrichment.
Understanding the distinction between UCC and common law contracts is crucial for legal professionals and individuals alike, as it can significantly impact the outcome of contract disputes.
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Common law and civil law
Civil law, on the other hand, is generally more prescriptive and is based on written legal codes created by legislators. Civil law systems typically consist of former French, Dutch, German, Spanish, or Portuguese colonies or protectorates, including much of Central and South America, as well as Louisiana in the United States due to its French influence. In civil law, while prior court decisions are not binding, the courts are required to follow the legal code. However, if the court interprets a legal code in a certain way, that interpretation does not bind the court for future cases, allowing for flexibility in interpretation. Civil law codes cover various areas of law, including corporate law, administrative law, tax law, and constitutional law.
One key difference between the two systems is their approach to contracts. In a common law system, contracts tend to be more detailed and lengthy since all relevant terms must be explicitly stated. In contrast, civil law systems place less emphasis on exhaustive contracts as inadequacies or ambiguities can be resolved by operation of law, resulting in shorter contracts. Additionally, certain legal concepts in civil law jurisdictions, such as infrastructure projects, may have definite technical meanings that may not be understood or applied in a common law country.
Another difference lies in their approach to business insolvency. Common law jurisdictions, such as England and the US, emphasise reorganisation over liquidation to keep the business as a going concern. On the other hand, civil law jurisdictions traditionally focused on liquidation, although countries like France and OHADA nations are now permitting reorganisations of debtors before insolvency.
While most countries predominantly follow either the common law or civil law system, some jurisdictions, like the United States, have a mix of both, with legal codes at the state and federal levels influenced by common law precedents.
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Common law's role in commercial systems
Common law is a body of law unwritten laws based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means "to stand by things decided". In other words, common law relies on case law, where courts follow precedents established by previous decisions.
Common law systems have greater flexibility in granting different types of security over assets, which is an important feature of PPP arrangements involving commercial funding. They also have the concept of trusts, which enable security interests to be held by a trustee for lenders in a syndicated loan situation without the need for formal transfer or re-registering of security interests in the names of new lenders. This is in contrast to civil law systems, where security interests generally need to be re-registered in the name of the new lender, involving additional registration costs and notarial fees.
Common law systems also allow for more flexibility in contract terms, with few provisions implied into a contract by law. This means that parties to a contract have extensive freedom to set out the terms governing their relationship. This flexibility can make commercial contracts more economically efficient and create greater wealth. For example, the Uniform Commercial Code (UCC) in the United States is a comprehensive set of laws governing all commercial transactions. It has been universally adopted by all 50 states, allowing businesses to enter into contracts with confidence that the terms will be enforced consistently across all American jurisdictions. This certainty allows businesses to grow and the economy to thrive.
Overall, common law plays a significant role in commercial systems by providing a flexible and predictable legal framework that enables efficient contracting and wealth creation.
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Frequently asked questions
Common law is a body of law based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means "to stand by things decided". Common law is derived from judicial decisions instead of statutes.
Common law influences the decision-making process in unusual cases where the outcome cannot be determined based on existing statutes or written rules of law. Common law systems promote stability and consistency in the legal justice system. Common law also allows for some freedom of interpretation, which is valuable as the law can be adapted to situations that were not contemplated at the time by the legislature.
Common law marriage, also known as a non-ceremonial marriage, is a legal framework that allows couples to be considered married without formally registering their union. Another example is in the area of contract law, where common law systems offer greater freedom of contract with fewer provisions implied into a contract by law.










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