Inventory Models

These models and simulations have been tagged “Inventory”.

Workforce, Inventory and Oscillation model from Vensim user guide.
Workforce, Inventory and Oscillation model from Vensim user guide.
From Jay Forrester' Principles of Systems
From Jay Forrester' Principles of Systems
Workforce and Inventory model
Workforce and Inventory model
This model includes Average Sales in Orders to bring some stability and allows Inventory 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.
It is a simple model to show how different parameters like inventory adjustment time and delay in ordering affect the inventory replenishment system. User can change values of all the parameters.
It is a simple model to show how different parameters like inventory adjustment time and delay in ordering affect the inventory replenishment system. User can change values of all the parameters.
A demonstration of a simple min/max inventory system
A demonstration of a simple min/max inventory system
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 is a first go at a simple inventory system. No delays between Orders and Deliveries. Inventory fails 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
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.
Sales department has targets to increase sales.
To make things more complicated program promos can be sold to have promotions.

What interactions arise in this situation?
What effects what?
Where do we have management point?

Situation and questions gave impulse for following CLD.
This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory. It also takes into account items On Order.
This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.
It also takes into account items On Order.
This model includes Average Sales in Orders to bring some stability and allows Inventory 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.
My first attempt at a "rich pic" to describe an inventory process.
My first attempt at a "rich pic" to describe an inventory process.
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.
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 assumes Sales are constant and used to calculate the number of items on orders
This model assumes Sales are constant and used to calculate the number of items on orders
This model assume Sales increase 10% and used to test to response of the number of items on orders
This model assume Sales increase 10% and used to test to response of the number of items on orders
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.
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 model includes Average Sales in Orders to bring some stability and allows Inventory 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 includes Average Sales in Orders to bring some stability and allows Inventory 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 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 is a first go at a simple inventory system. No delays between Orders and Deliveries. Inventory fails to attain the level of Desired Inventory.