Workforce, Inventory and Oscillation model from Vensim user guide.

From Jay Forrester' Principles of Systems

Supply Demand Inventory Modle

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

This is a first go at a simple inventory system. No delays between Orders and Deliveries. Inventory fails to attain the level of Desired Inventory.

A demonstration of a simple min/max inventory system

It is a Balanced Loop Model of Production. Production is driven by the gap between  Target Inventory and Inventory as well as orders.

From Jay Forrester' Principles of Systems

This model assumes Sales are constant and used to calculate the number of items on orders

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

This model using Ramp function

Este es un modelo simplificado de la gestion de inventario de un articulo.

Models the behaviour of ​Blood Bank and Hospital blood inventories in response to a step change in the demand for transfusions.  Delays can be set for the delivery of blood to the hospitals and for the response of donors to a request for more blood.

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

This is a first go at a simple inventory system. No delays between Orders and Deliveries. Inventory fails to attain the level of Desired Inventory.

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

This model assumes Sales are constant and used to calculate the number of items on orders

This model uses Step function

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

Free to air TV channels mostly receive income from sales of advertising. Advertising inventory gains value from TV channel ratings, that are created by high quality content. High quality content is created with investments and content promotion increases content awareness, thus increases TV channel appeal.
Advertising and promotion inventories share same space that is left after program is set up.
More over marketing has targets to increase TV channel appeal.

This model assume Sales increase 10% and used to test to response of the number of items on orders

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.