
Common sense is often considered to be a basic level of sound practical judgment or knowledge of basic facts that most people ought to possess. In law, common sense is not typically used as a legal argument, but it can be used as evidence that a ruling is correct. In Western Europe, common sense is applied in insurance law, where it is used to determine whether a customer can sue a company for product misuse. For example, a couple sued a washing machine company after their cat died from being put through a washing cycle. In the United States, laws are based on reasonableness, or what a reasonable person would do in similar circumstances. While the concept of common sense in law is not frequently mentioned, it is refreshing when courts recognize it as it often results in justice and fairness.
| Characteristics | Values |
|---|---|
| Common sense as a legal concept | Exists in Western Europe, especially in insurance law |
| Common sense in US law | Based on "reasonableness" or what a "reasonable person" would do |
| Tort law in the US | Plaintiff-friendly, with strict liability for manufacturers |
| Common sense in rulings | Courts may recognize common sense as evidence that a ruling is correct |
| Common sense in ethics inquiries | Attorneys may use common sense to determine if an attorney-client relationship exists |
| Definition of common sense | "Knowledge, judgment, and taste which is more or less universal and which is held more or less without reflection or argument" |
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What You'll Learn

Common sense in law is based on the 'reasonable person' standard
In the realm of law, common sense is often associated with the concept of the "reasonable person standard". This standard is used to determine negligence, particularly in cases involving personal injury, accidents, and civil liability. Negligence refers to the failure to exercise a reasonable standard of care that a prudent person with common sense would have used in similar circumstances.
The reasonable person standard serves as a benchmark to evaluate whether an individual's actions deviate from what a reasonable person would do. It is not a fixed set of rules but an adaptable concept shaped by societal norms, common sense, and prevailing standards of behaviour. The standard takes into account factors such as age, profession, knowledge, and experience to establish the expected standard of conduct. Jurors or the court consider the evidence and compare the defendant's conduct to that of a reasonable person. If the defendant's actions fall below the standard of care expected, they may be deemed negligent and held liable for any damages caused.
The reasonable person standard is an objective assessment of a person's actions, providing a concrete and uniform standard for evaluating behaviour. It is not specific to any one individual but rather applies to everyone in society. The standard allows for a determination of whether an action was negligent or careless by asking if a hypothetical average person would have acted similarly. This standard was reinforced by the English Court of Common Pleas in 1837 in the case of Vaughn v. Menlove, which established that individuals should be judged according to the standard of a reasonably prudent person.
While the reasonable person standard is a widely applied concept, there are exceptions. For example, minors, mentally disabled persons, experts, and those in exceptional physical condition may not be held to the same standard. The application of the standard can vary based on factors such as age, specialty, and the state with jurisdiction in the case. In some instances, courts may make special allowances for persons with cognitive disabilities or compare the actions of an individual with a mental illness to those of a reasonable person with a similar condition.
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It is not a legal argument, but can be used as evidence
Common sense is defined as "knowledge, judgement, and taste which is more or less universal and which is held more or less without reflection or argument". It is often considered to represent a basic level of sound practical judgement or knowledge of facts that any adult human being ought to possess.
In law, common sense is not a legal argument and is not a basis for legal analysis. However, it can be used as evidence to support a ruling. For example, in the case of an attorney making a special appearance, the court recognised that it was "consistent with common sense" that the attorney was representing the client's interests and had an attorney-client relationship with the client. This was used as evidence to support the ruling that the specially appearing attorney owed the same duties to the client as if they were the counsel of record.
In the US, common sense is particularly relevant in tort law, which is based on the objective "reasonable person" standard. This considers what a reasonable person would do in certain circumstances. For instance, a couple sued a washing machine company after their cat drowned as a result of them putting it in the machine. The court found that it was not a reasonably foreseeable misuse of the product and therefore fell under the common-sense understanding of what a reasonable person would do.
In Western Europe, common sense is also applied in insurance law, which explains why guarantee documents are not as lengthy as in the US.
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It is a concept used in Western European insurance law
Common sense plays a pivotal role in Western European insurance law, where it serves as a guiding principle in interpreting contracts and assessing liability. This concept is deeply rooted in the legal systems of this region and is applied by judges and legal scholars to ensure fairness and practicality in insurance-related matters.
In the context of insurance law, common sense is employed to interpret insurance policies and determine the scope of coverage. Insurance contracts often contain complex clauses and technical language that may be ambiguous or open to different interpretations. By applying common sense, legal professionals can decipher the true intent of the contract and ensure that it is interpreted reasonably and in a way that aligns with the average person's understanding.
For example, common sense dictates that an insurance policy should be construed in a manner consistent with the reasonable expectations of the insured. This means that the courts will consider what a typical policyholder would understand their coverage to entail and interpret the contract accordingly. This approach helps to prevent insurers from exploiting technicalities or ambiguous language to deny legitimate claims.
Additionally, common sense plays a role in assessing liability and determining fault in insurance cases. When evaluating the actions of individuals or entities involved in an incident, legal professionals apply common sense to analyze the situation and establish responsibility. This involves considering the reasonable actions that a prudent person should have taken under similar circumstances. By employing common sense, the law ensures that liability is assigned fairly and that those who acted negligently or irresponsibly are held accountable.
Common sense also extends to the assessment of damages in insurance claims. When determining the appropriate compensation for an insured loss, legal professionals consider the reasonable costs associated with the incident. Common sense dictates that the compensation should restore the insured to the position they were in before the loss occurred, neither enriching them nor leaving them unfairly disadvantaged. This approach ensures that insurance payouts are fair and proportional to the actual damages suffered.
In conclusion, common sense is an integral concept in Western European insurance law, guiding the interpretation of contracts, assessment of liability, and determination of damages. By applying common sense, legal professionals ensure that insurance law remains practical, fair, and accessible to all stakeholders. This concept helps to balance the interests of insurers and insured individuals, promoting a more equitable and efficient legal system.
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It is used to determine the creation of an attorney-client relationship
Common sense plays a role in determining the creation of an attorney-client relationship, which is established when an individual or group requests legal services from an attorney who agrees or appears to provide those services. An attorney-client relationship is founded on trust and confidence, as clients entrust their attorneys with highly sensitive and consequential matters.
When an attorney makes a special appearance in court, it is generally understood that they are representing the interests of a client, creating a presumption of an attorney-client relationship. This is based on the common-sense notion that an attorney would not appear in court on a matter that does not involve them unless they were acting on someone else's behalf.
For example, if an attorney accompanies a client to court and the counsel of record is unavailable, the specially appearing attorney assumes the duties of representing the client's interests. This is a practical application of common sense in law, as it ensures the protection of the client's rights and demonstrates the attorney's commitment to their ethical obligations.
However, it is important to note that common sense is not always a sufficient legal argument. While it can influence rulings and provide evidence to support them, it is not typically the sole basis for legal analysis or decision-making. Nonetheless, the presence of common sense in legal reasoning can contribute to a more accessible and understandable legal system.
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It is not a basis for legal analysis for non-lawyers
While common sense is often considered to be a basic level of sound practical judgement or knowledge of basic facts that most people possess, it is not always a reliable basis for legal analysis, especially for non-lawyers. This is because the law is complex and convoluted, and what may seem like common sense to a non-lawyer may not take into account the nuances and intricacies of the law.
In law school, students are taught that common sense is not a legal argument. This is because the law is based on specific rules, statutes, and precedents that may not always align with common sense. For example, in the United States, tort law is based on the objective "reasonable person" standard, which considers what a reasonable person would do in a given situation. This standard may not always align with common sense, as it is based on legal precedent and statutory interpretation rather than universal judgement or knowledge.
Additionally, the concept of common sense can vary across different cultures and societies. What may be considered common sense in one context may not be applicable in another. This subjectivity makes it challenging to rely on common sense as a basis for legal analysis, as the law aims to be objective and consistent.
Furthermore, the law often deals with complex ethical and moral issues that may not have clear-cut solutions. In these cases, relying solely on common sense may not lead to fair and just outcomes. The law must consider a range of factors and interests to ensure that decisions are made in a balanced and impartial manner, which may require a more nuanced approach than simply relying on common sense.
While common sense may not be a basis for legal analysis, it can still play a role in the law. In some cases, courts may recognize common sense as a factor in their rulings, indicating that their decisions are consistent with what most people would consider reasonable. However, this does not mean that common sense is the primary basis for the ruling but rather as evidence that the ruling is correct and aligns with societal expectations.
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Frequently asked questions
Common sense in law refers to the basic level of sound practical judgement or knowledge of facts that any adult human being is expected to possess.
Common sense is important in law because it helps to establish a standard of reasonableness or what a reasonable person would do in a given situation. This can be used to determine liability in certain cases, such as product liability.
Common sense works in law by providing a framework for understanding the motivations and actions of individuals involved in a legal case. It can also be used as evidence to support a ruling, even if it is not the basis for the ruling itself.










































