Custom (law)

Definition and stakes

Sir John W. Salmond,  Jurisprudence (1913)

“ Custom, merely as such, has no legal authority at all; it is legally effective only because and in so far as it is the expression of an underlying principle of right approved by those who use it. When it is based on no such ethical conviction or opinio necessitatis—when those who use it hold themselves free to depart from it if they will—it is of no legal significance. The only customs which are a source of law are those which are observed by the community as determining the rights and duties of its members. ”
Source: Gutenberg

Robert J. Shores,  New Brooms

“ As a custom becomes general—so general as to be termed the common custom among a given people—it is usually enacted as law. And even where such legislative sanction is wanting, a general custom takes on the force of law and operates as law, as is the case with the great body of the common law of England. Thus, a custom, which in the beginning all are free to adopt or to reject as they may see fit, eventually acquires the force of a rule to which all are obliged to conform, whether from strict legal necessity or merely by force of public opinion. ”
Source: Gutenberg

Sir John W. Salmond,  Jurisprudence (1913)

“ The importance of custom as a source of law continuously diminishes as the legal system grows. As an instrument of the development of English law in particular, it has now almost ceased to operate, partly because it has to a large extent been superseded by legislation and precedent, and partly because of the very stringent limitations imposed upon its law-creating efficacy, the legal requirements of a valid custom being such as few customs can at the present day conform to. ”
Source: Gutenberg

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