- published: 13 Oct 2013
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A de facto standard is a custom, convention, product, or system that has achieved a dominant position by public acceptance or market forces (such as early entrance to the market). De facto is a Latin phrase meaning "concerning the fact" or "in practice".
The term "de facto standard" is used in contrast with obligatory standards (also known as "de jure standards"); or to express the dominant voluntary standard, when there is more than one standard available for the same use.
In social sciences, a voluntary standard that is also a de facto standard is a typical solution to a coordination problem. The choice of a de facto standard is the better choice for situations in which all parties can realize mutual gains, but only by making mutually consistent decisions. In contrast, an enforced "de jure standard" is a solution to the prisoner's problem.
A selection of well-known and illustrative examples of de facto and de jure standards:
Examples of long-time de facto but never de jure standards (for computer file formats):
De facto (English pronunciation: /diː ˈfæktoʊ/, /deɪ/,Latin pronunciation: [deː ˈfaktoː]) is a Latin expression that means "concerning fact." In law, it often means "in practice but not necessarily ordained by law" or "in practice or actuality, but not officially established." It is commonly used in contrast to de jure (which means "concerning the law") when referring to matters of law, governance, or technique (such as standards) that are found in the common experience as created or developed without or contrary to a regulation. When discussing a legal situation, de jure designates what the law says, while de facto designates action of what happens in practice. It is analogous and similar to the expressions "for all intents and purposes" or "in fact". The term can also be used in the context of conducting activity as a "matter of course" e.g. copying an individual on an email de facto.
'De facto' racial discrimination and segregation in the USA during the 1950s and 1960s was simply discrimination that was not segregation by law (de jure).
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