A more complex system

We will build a more realistic system from the first one, by adding a variable and modifying the rules to take both variables into account.

The extra input is the parcel yield.

Our objective is to reproduce the reasoning synthesized on figure 2.
Price must go down when yield increases, and go up when the alcohoolic degree increases. Below a given degree, or above a given yield, price is set to a fixed value.

Figure 6: Cooperator remuneration
Image coop