You may be interested in Ongka's Big Maca (1974)[0]. It is a documentary that shows how the Big Man system and gift based economy work in PNG by following a specific Big Man's (Ongka) effort to put together a huge gift to increase his social status. It's a classic intro to anthropology film.
[0] https://en.wikipedia.org/wiki/Ongka%27s_Big_Moka