FuRyu has shared the details for the trade routes in The Legend of Legacy.
In the game, players are enabled to send a ship off from their local city to go visit neighboring cities. You have a choice between small, medium, and large ships that are designed to transport back various supplies and goods. The larger the ship, the more resources and time it costs to assemble them.
Lastly, the game supports StreetPass for the trading mechanics, where players can exchange goods between other players, at random.
The Legend of Legacy is coming to Japan on January 22nd.