1. Q1) Draw a causal loop diagram to portray all the vicious cycles that lead to the
escalation of violence between the football fans of Algeria and Egypt.
Q2) A lazy student once said: “The more I study, the more I know. The more I know,
the more I forget. The more I forget, the less I know. So why study?”
(a) Develop a stock-and-flow diagram of the process described above.
(b) Draw a time series graph and sketch a behavior pattern that displays “knowledge”
when there is forgetting and no studying. Use your stock-and-flow model to explain
why that behavior occurs. (Assume “knowledge” is “how much I know"; and that
initially you have a certain amount of knowledge)
(c) On the same graph, draw a second behavior pattern for “knowledge” when there is
constant studying and no forgetting. Also explain behavior.
(d) ) On the same graph, draw a third behavior pattern for “knowledge” when
studying always equal forgetting. Also explain behavior.
Q3) (a) Identify three basic generic behavior patterns in this graph of a stock.
(b) For each basic generic behavior pattern identified above, describe the generic
stock-and-flow of the linear structure necessary to produce the specific pattern, and
then sketch each stock-and-flow structure.
Q4) Sketch the development of the stock variable when the net rate of change is as
shown in the figure below. The initial value of the stock is zero bicycles. Remember
to put units on both axes.
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