Final answer:
In Mount Hagen tribes of New Guinea, moka is a ceremonial gift-giving system that is used to gain prestige and strengthen social bonds.
Step-by-step explanation:
According to Cronk in "Reciprocity and the Power of Giving," the Mount Hagen tribes of New Guinea utilize a gift-giving system called moka to gain prestige and establish social bonds. The moka system is a complex form of ceremonial gift-giving that plays a critical role in the social and economic sphere of these tribes. Through moka, individuals or groups provide gifts with the expectation that they will receive something of equal or greater value in return. This system reinforces relationships and allows leaders to earn respect and elevate their status within the tribe.