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Cycle inventory. First of all, we need to go through the idea of economic order quantity (EOQ). [6] EOQ is an attempt to balance inventory holding or carrying costs with the costs incurred from ordering or setting up machinery. The total cost will minimized when the ordering cost and the carrying cost equal to each other.
The figure graphs the holding cost and ordering cost per year equations. The third line is the addition of these two equations, which generates the total inventory cost per year. The lowest (minimum) part of the total cost curve will give the economic batch quantity as illustrated in the next section.
total annual inventory cost = purchase unit price, unit production cost = order quantity = optimal order quantity = annual demand quantity = fixed cost per order, setup cost (not per unit, typically cost of ordering and shipping and handling.
Therefore, in order to get the optimal production quantity we need to set holding cost per year equal to ordering cost per year and solve for quantity (Q), which is the EPQ formula mentioned below. Ordering this quantity will result in the lowest total inventory cost per year.
The total cost is given by the sum of setup costs, purchase order cost, stockout cost and inventory carrying cost: (,) = + [(,)] + (,) What changes with this approach is the computation of the optimal reorder point:
Average cost. The average cost method relies on average unit cost to calculate cost of units sold and ending inventory. Several variations on the calculation may be used, including weighted average and moving average. First-In First-Out (FIFO) assumes that the items purchased or produced first are sold first.
There is a setup cost s t incurred for each order and there is an inventory holding cost i t per item per period (s t and i t can also vary with time if desired). The problem is how many units x t to order now to minimize the sum of setup cost and inventory cost.
The typical cost of carrying inventory is at least 10.0 percent of the inventory value. So the median company spends over 1 percent of revenues carrying inventory, although for some companies the number is much higher. [4] Also, the amount of inventory held has a major impact on available cash.
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