4.2.3 Inventory related issues
Availability of inventory determines service level and at the same time excess inventory represents unnecessary costs and waste. The main issues faced by firms when determining when to order and how much to order and where to keep inventory are:
- Inventory related costs: This is the total inventory related cost and a combination of fixed order costs and inventory holding costs.
- Customer demand and service level commitment : In some business models today a product is made to order and the demand is known in advance; but in most cases demand for a product is estimated on the basis of forecasts. There are always uncertainties attached to the forecasts.
- Order lead time or replenishment lead time : This is the time taken to get the supply in hand from the time the order is sent out. The times in most cases will have a certain uncertainty attached to them.
- The inventory composition: The more types of products that are stored in the warehouse, the greater the uncertainty attached with the inventory.