System, program and method for determining optimal lot size

An optimal lot size determining program used in a system comprising an actual sales database for storing actual sales of an item and an item parameter database for storing parameters of the item, for realizing the functions of:

• predicting sales of the item based on actual sales stored in the actual sales database and/or parameters of the item stored in the item parameter database;
• obtaining an inventory cost function of lot size of the item, for costs including costs for storage and interest and a handling cost function of lot size of the item, for costs at both sides of sending and receiving the item, based on the predicted sales and item parameters stored in the item parameter database;
• and
• obtaining a lot size of the item, minimizing a sum of the inventory cost and the handling cost, to determine an optimal lot size.

An optimal lot size determining method through a system comprising an actual sales database for storing actual sales of an item and an item parameter database for storing parameters of the item, the method comprising the steps of:

• predicting sales of the item based on actual sales stored in the actual sales database and/or parameters of the item stored in the item parameter database;
• obtaining an inventory cost function of lot size of the item, for costs including costs for storage and interest and a handling cost function of lot size of the item, for costs at both sides of sending and receiving the item, based on the predicted sales and item parameters stored in the item parameter database;
• and
• obtaining a lot size of the item, minimizing a sum of the inventory cost and the handling cost, to determine an optimal lot size.

A computer readable medium having an optimal lot size determining program stored thereon for use in a system comprising an actual sales database for storing actual sales of an item and an item parameter database for storing parameters of the item, for realizing the functions of:

• predicting sales of the item based on actual sales stored in the actual sales database and/or parameters of the item stored in the item parameter database;
• obtaining an inventory cost function of lot size of the item, for costs including costs for storage and interest and a handling cost function of lot size of the item, for costs at both sides of sending and receiving the item, based on the predicted sales and item parameters stored in the item parameter database;
• and
• obtaining a lot size of the item, minimizing a sum of the inventory cost and the handling cost, to determine an optimal lot size.