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Homework answers / question archive / a frequently-used stock in modeling economic systems
a frequently-used stock in modeling economic systems. when production is greater than consumption, the excess production goes into inventory
the business-oriented application version of STELLA, by High Performance Systems
innovative learning style in which the teacher is no longer a dispenser of knowledge but rather a colleague. the teacher is a facillitating participant who sets directions and introduces opportunities. students working in small groups acquire their own knowledge without having it spoon-fed to them. such classrooms make acquisition of facts and information a consequence of needing inputs to reach an objective
an accumulation in a system. it represents the accumulated difference between inflow and outflow rates, illustrating the results of action within the system over time. levels are conserved quantities that can be changed only by moving contents in and out
a policy which can yield large changes in a system
a resources constraint, an external or internal response to growth. a growth caused by reinforcing feedback processes begins to slow and eventually come to a halt at the limit, and may even reverse itself and collapse. for instance, population growth is limited by space, water and resources essential for survival
a system in which different behavior models can be superimposed without interacting with one another
a system in which one loop is stronger. in a system with multiple loops, magnitudes and algebraic signs of variables determine what kind of behavior, positive or negative feedback is dominant at any given time. if the system exhibits any exponential growth, then the positive loop is dominant. if asymptotic behavior is evidenced, the negative loop has dominance. S-shaped growth is a common behavior of a system in which loop dominance shifts with time
a model representing the relationships and assumptions about a system held in a person's mind. Mental models are often correct in system structure, but frequently draw wrong conclusions about system behavior
feedback that works to cancel deviations from a goal. it exhibits goal-seeking behavior. the control decision attempts to adjust a system level to a value given by a goal introduced from outside the loop
