Talk:Dock (Age of Empires)/@comment-2601:281:8000:840:1C71:BC05:146:42D9-20180523201745/@comment-5157002-20180524160217

It shows how much gold is currently available at the Dock - if the player sends too many Trade Boats to a specific Dock, they'll have to wait for the gold to trickle up before they can trade.

I'd add it to the page, but I'm not entirely sure how to phrase it.