Trade across Faerûn moves from city to city, guild to guild, and plane to plane. A single contract may involve Cormyrean Golden Lions at the point of origin, Calishite Crescents at a mid stop, and final settlement in Faerûn Standard Dollars. To keep these movements steady, the Waterdeep Trading Company uses a method called currency triangulation. This keeps conversions fair, keeps ledgers clear, and protects the company from swings in regional markets.

Triangulation uses the Faerûn Standard D...