In the rule “Dishes”, after the text “The available Ingredients and their Costs” insert the text ” are publicly tracked, with the default Cost of each Ingredient being the following”.

Add a subrule to “Dishes” called “Market Prices” with the following text:

(Today Only:) The rest of this rule is flavor text.

Adjust Costs is an atomic action with the following steps:
* Privately generate a list containing each Ingredient and the number of times that Ingredient is in each Dish among all the Trucks’ Dishes, called the Demand List.
* Sort the Demand List from highest Ingredient count at the top to lowest count at the bottom, secondarily sorting alphabetically by Ingredient name from A to Z for any ties.
* For each Ingredient in the top 2 of the sorted Demand List, increase that Ingredient’s Cost by $1.
* For each Ingredient in the bottom 2 of the sorted Demand List, decrease that Ingredient’s Cost by $1, to a minimum of $1.

In the rule “The Night” add the following step after “Refresh: Set the Operating Status of all Trucks to Open”:

* (From Tomorrow:) Perform the Adjust Costs atomic action.