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Why do Papuan languages borrow features from neighboring languages?

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Papuan languages Map of the languages found on the Doberai Peninsula of New Guinea.

Papuan languages frequently borrow features from neighboring languages due to the region's complex, fragmented linguistic environment, which is characterized by a high concentration of small speech communities in a relatively confined area.1

This environment encourages widespread multilingualism, as members of a community often learn the languages of adjoining groups. Furthermore, the development of trade jargons and the shifting of language allegiance toward more powerful or economically advantaged neighbors facilitate extensive cross-influence.1

As a result, Papuan languages exhibit significant borrowing across all linguistic areas, including basic vocabulary, pronouns, grammatical patterns, and discourse styles. This pervasive borrowing makes it difficult for linguists to distinguish between genetically inherited material and borrowed features, complicating the establishment of genetic links among these languages.1