Unique in what way? I've played in several realms were region lords could expect payment for their food within the realm, or sell it outside the realm at a profit.
That the food supply is probably capped at like 10%, that so many big cities are bundled together without any major food producers. In most places, food supply is close to 100% (when discarding tiny realms that have extreme ratios), meaning a relatively small demand for food and keeping food prices down. In Dwilight, D'Hara has a demand that is unequaled anywhere else in the game, making a considerable pressure on food stocks and driving prices up.
I even predict it to eventually become problematic that the food prices are capped. Our suppliers are asking, on average, increasing prices. If we can't set a buy price higher than their sell price, then our traders can't make a profit. If they can't make a profit, then why would they bother? The 50 gold per unit limit is going to seriously hurt, if it remains too long.
