The demands are influenced by both external and internal factors and are balanced by the creation of purchase order requests to keep supplies at a reasonable or prescribed level.
A good inventory management system will be able to list all stock options with a size colour matrix as well as give live reports on best or worst sellers, supply chain and sales staff.
Many large organizations use sophisticated ERP systems such as Oracle EBS[1] and SAP for inventory management.
If the stock is too large (especially with perishable goods as fruit, vegetables...) there is a risk of financial losses as some of the inventory may spoil while sitting in the store.
To reduce this risk (and keep financial losses as small as possible), there is hence benefit in precisely recording the weekly purchases of the shop's customers.