This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.
This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.
Exercise 1. 'Water
in bathtub' is the stock, measured as a volume of water, in L. The bath is initially empty. The bath receives water from the taps ('Variable inflow from tap', in
L/min) and loses water to the drain ('Constant outflow to drain', in
L/min). 'Twiddling the taps' automatically switches the inflow from 40
L/min to 20 L/min at 5 minute (300 second) intervals. The outflow
remains constant at 30 L/min.
This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.
This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.
This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.
This model fills a bathtub, while outflow occurs at a flow determined by the volume of water (or pressure at outlet) of the bathtub. It could just as well be a dam or lake that is modeled.
Simple model for new product sales that contemplates the effect of success and competition.
Sales initially grow as the new product moves from introduction into growth. Sales success attracts competitors who introduce their own products which reduces sales growth of the new product.
Eventually the total number of products that the market can bear are sold which stops further sales.
More advanced models could contemplate how competition affects price, how new successful products from competitors take market share, etc.
