Common law is primarily based on what?

The correct understanding of common law is that it primarily derives from judicial decisions. This legal system evolves through the rulings of judges in individual cases, where past decisions (precedents) set the framework for how similar future cases are determined. The essence of common law is that it is shaped by the interpretations and applications of the law in real-world scenarios, meaning that it is built upon historical legal judgments rather than being solely dictated by legislative statutes or customs.

To clarify the context regarding the other options, legislation refers to laws enacted by a legislative body, which can exist independently of common law. Customs may influence legal practices and uphold traditions, but they do not form the foundation of the common law system itself. International treaties pertain to agreements between sovereign nations and do not directly relate to the principles of common law as practiced within a specific jurisdiction. Thus, the nature of common law fundamentally centers on the role of judicial decisions in establishing legal principles and guidelines.