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Simple Retail Sector
Ash Moran
The Simple Retail Sector model from Section 1.7 of
DYNAMO User's Manual
by Alexander L Pugh III, which is adapted from one from
Industrial Dynamics
by Jay Forrester.
http://www.amazon.com/DYNAMO-Manual-Edition-System-Dynamics/dp/0262660296
(I bought the 5th edition without realising there was a later one, hopefully it's still the same model in there.)
A tweaked version with slightly more explicit stocks is here:
http://insightmaker.com/insight/14467