Multilingualism
In communities

Widespread multilingualism is one form of language contact. Multilingualism was common in the past: in early times, when most people were members of small language communities, it was necessary to know two or more languages for trade or any other dealings outside one's town or village, and this holds good today in places of high linguistic diversity such as Sub-Saharan Africa and India. Linguist Ekkehard Wolff estimates that 50% of the population of Africa is multilingual.

In multilingual societies, not all speakers need to be multilingual. Some states can have multilingual policies and recognize several official languages, such as Canada (English and French). In some states, particular languages may be associated with particular regions in the state (e.g., Canada) or with particular ethnicities (e.g., Malaysia and Singapore). When all speakers are multilingual, linguists classify the community according to the functional distribution of the languages involved:

Note that the terms given above all refer to situations describing only two languages. In cases of an unspecified number of languages, the terms polyglossia, omnilingualism, and multipart-lingualism are more appropriate.

Taxell's paradox refers to the notion that monolingual solutions are essential to the realization of functional bilingualism, with multilingual solutions ultimately leading to monolingualism. The theory is based on the observation of the Swedish language in Finland in environments such as schools is subordinated to the majority language Finnish for practical and social reasons, despite the positive characteristics associated with mutual language learning.
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