How did trade jargons develop among Papuan-speaking communities?

The development of trade jargons among Papuan-speaking communities was primarily driven by the region's complex and fragmented linguistic environment. With hundreds of distinct languages often spoken by very small groups in close proximity, high levels of multilingualism became necessary for interaction.1

This concentration of diverse speech communities in a confined area fostered the creation of jargons and lingua francas to facilitate communication between populations whose native languages were not mutually intelligible. These trade languages often evolved from simplified varieties used in commercial exchange. For example, Hiri Motu emerged as a simplified trading language in the area around Port Moresby. Similarly, Tok Pisin developed as an effective lingua franca to bridge the gap between the region's many indigenous tongues.123

These linguistic developments were supported by elaborate regional trade and exchange systems, which connected communities across rugged terrain and fostered interdependency through the movement of goods and ceremonial valuables.4