
The common law developed in England's central royal courts—the Court of King's Bench, the Court of Common Pleas, and the Exchequer—after the Norman Conquest of England in the 11th century. Initially, a writ was likely a vague order from the King to do right by the plaintiff. Over time, the writ procedure became more rigid. Equity, on the other hand, refers to a separate body of rules that originated in a distinct system of courts, specifically the Court of Chancery. While the Judicature Acts of the 1870s brought about a procedural fusion of common law and equity, ending their institutional separation, this did not result in a fusion of the actual bodies of law. The 'fusion wars of the twentieth century saw increased debate over the treatment of equity as a separate legal body, with some arguing for a unified system and others maintaining the distinction between common law and equity.
| Characteristics | Values |
|---|---|
| Equity is a body of law that | Developed in the English Court of Chancery |
| Common law | Developed in the central royal courts: the Court of King's Bench, the Court of Common Pleas, and the Exchequer |
| The Judicature Acts of the 1870s ended the institutional separation of common law and equity | |
| Jurisdictions that inherited the common law system differ in their treatment of equity | |
| Equity remains a distinct body of law in England and Wales, Australia, New Zealand, and Canada | |
| Modern equity includes the law relating to express, resulting, and constructive trusts | |
| The U.S. federal system and most states have merged the courts of law and chancery | |
| The concept of "unjust enrichment" was a particular flashpoint in the "fusion wars" debates |
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What You'll Learn

The Judicature Acts of the 1870s
The Judicature Acts aimed to resolve the issues caused by the separate court systems of "law" and "equity". Before the Acts, the courts of "law" could only award monetary damages and recognised the legal owner of the property, while the courts of "equity" administered a different set of rules. The Acts amalgamated these courts into a single Supreme Court capable of administering both law and equity. This procedural fusion allowed the same court to apply the rules of common law or equity, depending on the specific case, prioritising substantial justice.
The Judicature Acts also reformed the pleading process, shifting the emphasis from the "form" of action to the "cause" of action. Litigants were required to fill out writs stating the facts, without needing to conform to specific forms. Additionally, the Acts strengthened the court of appeal, transferring the judicial functions of the House of Lords to an appellate committee, which included the lord chancellor, experienced judges, and Lords of Appeal in Ordinary appointed under the Appellate Jurisdiction Act 1876.
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The 'fusion fallacy'
The concept of the fusion of common law and equity has been a subject of debate for ages, with the relationship between the two legal concepts being interpreted differently by various scholars. The fusion fallacy viewpoint argues that common law and equity are separate entities and should not be combined. This perspective is based on the traditional approach to the relationship between common law and equity, which emphasises the need to maintain their separation.
Proponents of the fusion fallacy argue that combining equity and common law would be offensive to deeply rooted doctrines, and that any practical implementation of fusion would require legislative power or the involvement of a higher court, such as the High Court. They contend that while fusion may provide a mechanism to keep the power of common law in check, it is not a justification for merging the two legal concepts.
The fusion fallacy also encompasses the idea that applying principles from one jurisdictional branch to the other can lead to legal incoherence. For example, the availability of exemplary damages at common law but not in equity can create inconsistencies. Advocates of the fusion fallacy argue that these inconsistencies cannot be resolved through fusion, as it would condemn both large and small-scale fusion as equally unacceptable.
However, it is important to note that the debate around fusion is complex, and some academics and legal professionals support the idea of fusion. They argue that judges have the tools to break down historical barriers and that the law should provide a full range of remedies, regardless of whether they originated in common law, equity, or statute. This pro-fusion perspective suggests that the law is evolving and that fusion can lead to a more comprehensive and just legal system.
In conclusion, the fusion fallacy represents a viewpoint that resists the combination of common law and equity, citing historical doctrines, potential practical challenges, and concerns over legal incoherence. While it offers a traditional and strict interpretation of the relationship between common law and equity, it is just one perspective in the ongoing and complex debate surrounding the fusion of these two legal concepts.
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The 'fusion wars'
The "fusion wars" refer to the debates over whether equity and common law have been fused or are simply administered by the same court. After the Norman Conquest of England in the 11th century, royal justice was administered in three central courts: the Court of King's Bench, the Court of Common Pleas, and the Exchequer. These courts, created by the authority of the King of England, developed the common law. Initially, a writ was likely a vague order from the King to do right by the plaintiff. Over the 12th and 13th centuries, this procedure became more rigid.
The Court of Chancery, which administered the law of equity, was established to counter the inflexibility of the common law courts. Before 1873, England had two separate court systems: courts of "law" that could only award monetary damages and recognised only the legal owner of the property, and courts of "equity" that could recognise and enforce equitable remedies such as trusts. The Judicature Acts of the 1870s brought a procedural fusion of the two bodies of law, ending their institutional separation. However, the reforms did not fuse the actual bodies of law.
The split between the two systems propagated to many colonies, including the United States. Some US states continue to have divided Courts of Law and Courts of Chancery. In the latter part of the twentieth century, there was increased debate over the utility of treating equity as a separate body of law. Some common law systems began to place less emphasis on the historical or institutional origin of substantive legal rules. A particular flashpoint in the fusion wars debate centred on the concept of unjust enrichment and whether areas of law traditionally regarded as equitable could be rationalised as part of a single body of law.
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The Federal Rules
One of the key features of the Federal Rules was the introduction of a single form of action, known as the "civil action." This new concept combined the traditional forms of action from both law and equity. As a result, plaintiffs were no longer required to specify whether they were bringing an action at law or a suit in equity; instead, they simply commenced a civil action. This change reflected a more flexible and pragmatic approach to justice, where the appropriate remedy could be determined on a case-by-case basis, drawing from the full range of legal and equitable remedies.
Additionally, the Federal Rules introduced a more flexible approach to pleading requirements. Under the old system, pleadings in equity often required a high degree of specificity, with plaintiffs needing to plead detailed facts to support their claims. In contrast, the Federal Rules adopted a more simplified and notice-based approach to pleading, requiring only a short and plain statement of the claim. This change made it easier for plaintiffs to initiate suits and shifted the focus towards a more substantive examination of the claims during the litigation process.
The adoption of the Federal Rules marked a significant step towards the unification of law and equity, bringing an end to the historical separation of the two systems. While the Federal Rules did not explicitly abolish the distinction between law and equity, they created a procedural framework that treated them as a unified whole. This fusion of law and equity had a profound impact on the American legal system, influencing subsequent legal developments and shaping the way disputes are resolved in modern courts.
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Equity in the US federal system
In the US federal system, the debate over the utility of treating equity as a distinct body of law from common law has been ongoing. For context, equity refers to a specific set of rules that originated in a specialised court system, specifically the English Court of Chancery. While common law was historically developed and administered in central royal courts, such as the Court of King's Bench, the Court of Common Pleas, and the Exchequer, equity was the law administered in the Court of Chancery.
In the US context, the states of Delaware, Mississippi, South Carolina, and Tennessee maintain separate Courts of Law and Courts of Chancery. Conversely, New Jersey has unified appellate courts, but its trial courts are divided into a Chancery Division and a Law Division.
The twentieth century witnessed a shift in perspective, with some common law systems prioritising the present-day relevance of substantive legal rules over their historical or institutional origins. This evolution in legal thinking influenced the US federal system and most states to merge the Courts of Law and Chancery. However, it's important to clarify that while the Judicature Acts of the 1870s unified the administration of the two legal systems, they did not blend the substantive laws themselves.
The "'fusion wars'" encapsulate the intense debates surrounding the relationship between equity and common law. A pivotal issue in these discussions was the concept of unjust enrichment and whether equitable areas of law could be integrated into a unified body of law centred on unjust enrichment. Despite the merger of courts in the US federal system, the "'fusion fallacy'" highlights the enduring challenge of obtaining equitable remedies for common law wrongs.
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Frequently asked questions
In jurisdictions following the English common law system, equity is a body of law that was developed in the English Court of Chancery. Common law, on the other hand, was historically administered in the central royal courts: the Court of King's Bench, the Court of Common Pleas, and the Exchequer.
The Judicature Acts of the 1870s ended the institutional separation of common law and equity, allowing them to be administered concurrently. However, the two bodies of law were not fused, and this lack of fusion had important implications, such as the inability to receive an equitable remedy for a purely common-law wrong.
The "fusion wars" were debates in the late twentieth century over the utility of treating equity as a separate body of law. A particular point of contention was the concept of unjust enrichment and whether areas of law traditionally considered equitable could be rationalised as part of a single body of law.











































