Trading resources with other players (offers)
Offer one resource for another at the Marketplace. The ratio must be between 1:2 and 2:1. When someone accepts, both sides send merchants.
Create an offer: amount and resource you give, amount and resource you want. Optional: maximum transport time (hours) and "own alliance only".
Your resources and merchants are reserved until the offer is taken or cancelled.
Under Buy you see others' offers, nearest first. Accepting needs free merchants and the resources.
Cancelling returns the resources (only up to your storage).
