(First if this suggestion was already made I 'm sorry to restart the thread)
Resources exchange is missing you can still made exchange with market but it'snt convenient and sometimes players put a huge and very high buy order to kill the market, so you can only sell to them.
Also Trade embargo is missing. Of course you can't sell or buy resources to your enemies but you can't prevent neutral to buy your resources, you are selling the rope to later hang yourself
Resources exchange is missing you can still made exchange with market but it'snt convenient and sometimes players put a huge and very high buy order to kill the market, so you can only sell to them.
Also Trade embargo is missing. Of course you can't sell or buy resources to your enemies but you can't prevent neutral to buy your resources, you are selling the rope to later hang yourself