Trade
Via trade, players can swap resources with one another. A player needs the market building to be able to trade. The donkey stable is not necessary, but it is very important for players that trade a lot.
Donkeys
To trade, a player needs donkeys. Every donkey has a particular amount of resources that he can transport. After arriving at the destination settlement, the donkey does not return, meaning that it has to be re-bred. As soon as the donkey leaves its settlement, it will be reproduced. There is a basic production for this (donkey per hour), that is increased by the level of the donkey stable, while the market determines the maximum holding capacity of the donkey.