Trade between countries, guilds, and the most powerful individuals, is often governed by the rule of Moka. Under this rule one side will give a gift of great value. This will create an obligation for the recipient to give a greater gift, or a favour of comparable worth. This second gift will create an obligation for a still-greater gift, and so on. The skill of Moka is to give a gift of such value that the recipient will prefer to owe a favour, rather than being able to give a counter-gift, or ending the cycle by refusing the gift and thus creating a state of hostility or even war.
Adventurers may be hired to fetch an appropriate object to give as a gift, or to deliver it. This second task may be as dangerous as the first, since if the gift-bearer meets with an 'accident' before delivering the gift it has no value. Yet if a gift is delivered in public sight anyone who values their position must acknowledge it and protect the person of the gift-giver.