@anderselowsson
During their discussion, the friends have figured out that apple demand depends on both apple price and transportation costs. They discuss quirks and alternatives, perhaps bus travelers are just stopping by for a snack on their way home, perhaps demand for apples is inherently rather fixed anyway, and perhaps it is impossible to know how many apples customers will buy on average each auction round as the orchard grows? Perhaps Audrey should just change her auction mechanism?
While there are many nuances, they want something simple that they can implement tomorrow, yet theoretically sound and generally considered fair and neutral by their customers. The friends therefore decide on the following:
* Therese checks the price of a bus ticket and shares it with Audrey,
* Audrey stops reducing the price when the total cost of the 6 apples that the orchard produces each round equals the bus ticket price.