A small change in one variable can have a marked impact on multiple variables. Run the model [quits change] = 0 and consider the output. What happens if you change [quits change] = 5. Run the model to find out. Was the change what you expected?
Consider the following "Sustaining the Forest" model intended to provide another example of how unexpected the behavior of a web of extended interactions can be.
When one undertakes to create a model there are a number of guidelines that are considered essential for consideration if there is to be a success with the model.