Our model should give us an idea of the general economics of the process and the influence of the main factors on it. This means that our model should simultaneously contain both production (technological) parameters and economic values. We list them.
- amount of hay fed
- amount of water supplied
- the amount of milk received
- the amount of manure received
Inside the black box (cow), hay and water are divided into milk and manure in some proportion, this proportion will also be one of the parameters of the model. And add complication: let it be winter and we need to heat the barn. This means that the temperature that needs to be maintained in the room and the power of the energy that is spent on heating will be added to the technological parameters.
The economic parameters (let's take them from the accounting department) in our model will be the purchase prices for hay, water and electricity, as well as the sale prices of milk and manure.
We get the following model: