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The sales model shown below contains a major positive feedback loop, in which more sales people can generate more sales, thereby increasing revenue and allowing more sales people to be hired.  A minor negative feedback loop allows adjustment of the sales force over a period of time through hiring and layoffs.

EITHER

ØOpen the model sales.mdl contained in the directory UserGuide\chap15 (a completed version is in the Complete directory).

OR

ØBuild the model as shown in the diagram and equation listing below and save it in the directory UserGuide\chap15 with a different name (e.g., sales1.mdl).  Time Bounds are INITIAL TIME = 0, FINAL TIME = 60, TIME STEP = 0.25, Units for Time: Month.