Tabletop RPGs are not realistic, and this is a good thing. On one extreme we don’t really want to simulate the hygiene of our fantasy worlds, and on the other we don’t really want to play Apartment: The Playstationing. What RPGs should and do have, though, is verisimilitude. Verisimilitude is the appearance of being real, and in RPGs this means that the characters exist in a world which behaves in a way the players expect. One place where games fall down in this respect is in having a world that changes around the characters, one that might even be responsive to their actions. That is why I’m returning to my old stomping ground, the field of economics.