05. mixed systems

The question

The preceding sub-units examined the principal legal traditions of the world as though each existed in a pure form, a system wholly common law, wholly civil law, wholly religious, or wholly customary. The legal systems of the actual world rarely answer to this description. Most combine elements of more than one tradition, and the combination is the normal condition rather than the exception. This concluding sub-unit examines the mixed legal system, asks why such systems are so common, describes how the traditions combine within a single order, and explains why the existence of mixed systems matters for anyone who must analyse a legal question across borders. The question completes the module by correcting the impression of pure types that the separate treatment of the traditions may have created.

What a mixed system is and why it is common

A mixed legal system is a legal order that draws substantial elements from more than one of the great legal traditions, so that it cannot be classified as belonging wholly to any single one. The mixture may combine common law and civil law, civil law and religious law, common law and customary law, or several traditions together, and the elements may be distributed across different fields of law within the same system or blended within a single field.

The commonness of mixed systems follows from the way legal traditions have spread across the world, which connects this sub-unit to the history of law treated later in the course. Traditions were carried across the globe by conquest, colonisation, trade, and deliberate borrowing, and where an incoming tradition met an established one, the result was frequently a combination rather than a clean replacement. A territory governed first by a customary or religious order, then brought under the law of a colonial power of one tradition, and later influenced by another, accumulates layers that combine into a mixed system. The pure type is the abstraction; the mixture is the historical reality.

Consider a legal order in which the law of contract and commerce derives from the civil law, the law of certain public institutions derives from the common law, and the law of marriage and inheritance for parts of the population derives from a religious or customary tradition. Such an order belongs to no single tradition; it is mixed, and its character can be stated only by identifying which tradition governs which field. A great many of the world's systems are mixed in something like this way.

A mixed legal system is therefore one that combines substantial elements of more than one tradition, and the prevalence of such systems reflects the historical movement of legal traditions across the world, which produced combination far more often than pure descent.

How the traditions combine

The combination of traditions within a mixed system takes characteristic forms, and understanding these forms is the key to analysing such a system. The forms may be distinguished by the manner in which the traditions are distributed within the order.

In some mixed systems, different traditions govern different fields of substantive law, so that, for instance, the private law of obligations follows the civil law while the public and commercial law follows the common law, each tradition supreme within its own domain. In other mixed systems, the traditions are combined within the institutions of the legal order, so that a system may apply civil law substance through procedures and a judicial method drawn from the common law, or may operate a unified court system that administers both a religious or customary law and a general state law. In still others, the traditions are layered by the population they govern, so that the general law applies to most matters while a religious or customary law governs the personal status of particular communities, an arrangement examined in the sub-units on religious and customary law.

Suppose a commercial dispute arises in a mixed system whose law of obligations is civil law in substance but whose courts follow common law procedure. The lawyer must reason from the code to determine the parties' substantive rights, in the deductive manner of the civil law, while conducting the litigation through the adversarial procedure and the rules of precedent that the system has drawn from the common law. The analysis requires command of both traditions at once, applied to their respective aspects of the single dispute. The example shows that a mixed system cannot be understood through the lens of one tradition alone.

The traditions combine, then, by field, by institution, or by population, and the analysis of a mixed system consists in identifying, for the question at hand, which tradition governs and in what respect, a task that requires familiarity with each of the traditions the system has drawn upon.

The practical significance of mixed systems

The prevalence of mixed systems carries a practical lesson that completes the module, namely that the classification of a legal system by tradition is a starting point for analysis rather than a conclusion. To know that a system is broadly civil law or broadly common law is to know where to begin, yet the actual law on a given question may be drawn from a different tradition, and the careful analyst confirms the source of the particular rule rather than assuming it from the system's general character.

This lesson connects directly to the cross-border concerns that run throughout this course. An enterprise operating across several states encounters systems of differing and often mixed character, and a rule it relies upon in one system may rest upon a different tradition, and operate by a different method, in another. The discipline the module teaches is to approach each system on its own terms, to identify the traditions it combines, and to determine, for each question, which tradition supplies the governing rule and how that rule is to be found and applied.

Imagine the same enterprise enforcing a commercial contract in three states: one a relatively pure civil law system, one a relatively pure common law system, and one a mixed system combining the two. The enterprise cannot apply a single method across all three; it must reason from the code in the first, from precedent in the second, and from whichever tradition governs the relevant field in the third, confirming in each case the source and method that the particular system supplies. The example shows that the comparative knowledge built across this module is a practical instrument, applied question by question and system by system.

The practical significance of mixed systems is therefore that they require the analyst to treat the classification of a system as the beginning of inquiry, to identify the traditions a system combines, and to confirm for each question the tradition that governs, a discipline that is the central skill the comparative study of legal systems is meant to build.