19.5 Inventory Management

3 min readjune 18, 2024

Inventory management is crucial for businesses, balancing costs and customer satisfaction. It involves managing ordering, carrying, shortage, and to optimize working capital and .

Effective inventory control impacts profitability, customer satisfaction, and overall business performance. Key strategies include , setting reorder points, and managing inventory cycles. The ratio helps measure efficiency and identify areas for improvement.

Inventory Management

Components of inventory cost

    • Expenses associated with placing and receiving inventory orders (purchase orders, shipping, receiving)
    • Higher increase working capital requirements by tying up funds in the ordering process
    • Expenses incurred from holding and storing inventory (storage space, insurance, obsolescence, opportunity cost of capital)
    • Higher raise working capital needs as more funds are allocated to maintaining inventory
    • Includes maintaining to buffer against unexpected demand or disruptions
    • Losses incurred when demand cannot be met due to insufficient inventory (lost sales, customer dissatisfaction, potential loss of future business)
    • Shortages may necessitate additional working capital to expedite orders or find alternative suppliers to meet demand
  • Purchase costs
    • The actual expense of buying inventory items influenced by factors such as quantity discounts and supplier credit terms
    • Lower purchase costs reduce working capital requirements by minimizing the funds needed to acquire inventory

Inventory management's business impact

  • Profitability
    • Efficient inventory management minimizes total inventory costs leading to higher gross margins and profitability
    • Optimal inventory levels reduce the risk of obsolescence and write-offs (perishable goods, technology products)
  • Customer satisfaction
    • Adequate inventory levels ensure product availability and timely order fulfillment building customer loyalty and repeat business
    • Stockouts lead to lost sales and dissatisfied customers (during peak shopping seasons)
  • Balancing act
    • Inventory management must strike a balance between cost minimization and service level optimization
    • Too much inventory increases costs and reduces profitability while too little risks stockouts and customer dissatisfaction

Days in inventory ratio

  • Days in inventory (DII) ratio measures the average number of days a company holds inventory before selling it
    • Formula: DII=Average InventoryCost of Goods Sold×365DII = \frac{Average\ Inventory}{Cost\ of\ Goods\ Sold} \times 365
    • Lower DII indicates more efficient inventory management and faster turnover (retail industry)
  • Interpreting DII involves comparing it to industry benchmarks and competitors and tracking over time to identify trends
    • High DII may indicate excess inventory, slow-moving products, or poor demand forecasting (seasonal items)
    • Low DII suggests efficient inventory management but may also risk stockouts if too low
  • Improving DII can be achieved through:
    1. Implementing (JIT) inventory management to reduce holding costs
    2. Optimizing reorder points and quantities based on demand forecasts and lead times
    3. Regularly reviewing and adjusting inventory levels based on sales data and market trends

Inventory Control Strategies

  • Demand forecasting: Predicting future customer demand to optimize inventory levels
  • : The inventory level at which a new order should be placed, considering and expected demand
  • : The recurring process of ordering, receiving, and depleting inventory
  • : A unique identifier for each distinct product and its attributes, used for inventory tracking and management

Key Terms to Review (27)

ABC Analysis: ABC analysis is a method used in inventory management to categorize items based on their relative importance or value to an organization. It helps prioritize and manage inventory more effectively by dividing items into three categories: A, B, and C, based on their consumption value or annual dollar usage.
Carrying costs: Carrying costs are the expenses a company incurs to hold and store its inventory over a specific period. These include storage costs, insurance, taxes, and opportunity costs associated with holding inventory.
Carrying Costs: Carrying costs, also known as holding costs, refer to the expenses incurred by a business in maintaining and storing its inventory. These costs are directly associated with the decision to hold inventory within the organization, rather than purchasing or producing goods only when needed.
Days in Inventory: Days in inventory, also known as days of inventory or days sales of inventory, is a financial metric that measures the average number of days a company takes to sell its inventory. It is a key indicator of a company's inventory management efficiency and working capital requirements.
Days Sales of Inventory: Days sales of inventory (DSI) is a financial metric that measures the average number of days a company takes to sell its inventory. It is a key indicator of a company's inventory management efficiency and liquidity. DSI provides insight into how quickly a business can convert its inventory into cash through sales.
Demand Forecasting: Demand forecasting is the process of estimating the future demand for a product or service based on historical data, market trends, and other relevant factors. It is a critical component in both sales forecasting and inventory management, as it helps businesses plan and allocate resources effectively.
Economic Order Quantity: Economic Order Quantity (EOQ) is a model used in inventory management to determine the optimal quantity of a product that should be ordered to minimize the total costs associated with ordering and holding inventory. It balances the trade-off between the costs of placing orders and the costs of carrying inventory.
Finished Goods: Finished goods refer to products that have completed the manufacturing process and are ready for sale or distribution to customers. These are the final, completed items that a company produces and has available for purchase, in contrast to raw materials or work-in-progress inventory.
Inventory Cycle: The inventory cycle refers to the recurring process of ordering, receiving, storing, and using inventory within a business. It encompasses the various stages and activities involved in managing a company's stock of raw materials, work-in-progress, and finished goods to meet customer demand efficiently.
Inventory turnover: Inventory turnover measures how efficiently a company sells and replaces its stock of goods during a specific period. It is calculated by dividing the cost of goods sold (COGS) by the average inventory.
Inventory Turnover: Inventory turnover is a measure of how efficiently a company manages and sells its inventory. It represents the number of times a company sells and replaces its inventory during a given period, typically a year. This metric is important in evaluating a company's operational efficiency and liquidity.
Inventory Turnover Ratio: The inventory turnover ratio is a measure of how efficiently a company manages and sells its inventory. It calculates the number of times a company's inventory is sold and replaced over a given period, providing insights into a company's operational efficiency and liquidity.
Just-In-Time: Just-In-Time (JIT) is a production and inventory management strategy that aims to improve a business's efficiency, competitiveness, and profitability by receiving goods only as they are needed in the production process, thereby reducing inventory costs and storage requirements.
Lead Time: Lead time refers to the amount of time between the initiation of a process and its completion. In the context of inventory management, lead time is the period between placing an order for goods and receiving those goods into inventory.
Liquidity: Liquidity refers to the ease and speed with which an asset can be converted into cash without significant loss in value. It is a crucial concept in finance that encompasses the ability of individuals, businesses, and markets to readily access and transact with available funds or assets.
Ordering costs: Ordering costs are the expenses incurred in placing and receiving orders for inventory. These include order processing, transportation, and handling charges.
Ordering Costs: Ordering costs refer to the expenses incurred by a business when placing an order for inventory. These costs are associated with the administrative and logistical processes involved in replenishing the company's stock of goods or materials, and they play a crucial role in the overall management of inventory within the context of Inventory Management.
Profitability: Profitability refers to a company's ability to generate earnings, profits, and cash flow relative to the resources it has invested. It is a fundamental measure of a business's financial health and performance, as it indicates the efficiency and effectiveness with which a company can convert its resources into profitable outcomes.
Purchase Costs: Purchase costs refer to the total expenses incurred when acquiring inventory or other goods for a business. These costs encompass the price paid to suppliers, as well as any additional fees or charges associated with the procurement process.
Raw Materials: Raw materials refer to the basic, unprocessed inputs used in the production of goods. These are the fundamental components that undergo various manufacturing processes to create finished products. Raw materials are the starting point for the creation of value-added items within a supply chain or production system.
Reorder Point: The reorder point is the inventory level at which a new order should be placed to replenish stock and prevent stockouts. It is a critical concept in inventory management, ensuring that businesses maintain adequate supplies to meet customer demand without excessive inventory holding costs.
Safety Stock: Safety stock refers to the additional inventory that a business maintains to mitigate the risk of stockouts or shortages due to unexpected fluctuations in demand or supply. It serves as a buffer to ensure that the company can continue to meet customer orders and maintain operations even when faced with uncertainties.
Shortage Costs: Shortage costs refer to the financial and operational expenses incurred by a business when it does not have enough inventory to meet customer demand. These costs arise when a company is unable to fulfill orders or provide products and services to its customers in a timely manner.
Stock-Keeping Unit (SKU): A stock-keeping unit (SKU) is a unique identifier assigned to each distinct product or service that a business offers. It serves as a way to track and manage inventory, sales, and other important business metrics related to the specific product or service.
Stockout costs: Stockout costs are the expenses incurred when inventory is insufficient to meet customer demand. These costs can include lost sales, expedited shipping fees, and diminished customer loyalty.
Supply chain: A supply chain is the interconnected network of individuals, organizations, resources, activities, and technology involved in the creation and sale of a product. It encompasses everything from raw material suppliers to end consumers.
Work-in-Progress: Work-in-progress (WIP) refers to the inventory of partially completed goods that are in the process of production. It represents the value of raw materials, labor, and overhead costs that have been incurred for products that are currently being manufactured but are not yet finished or ready for sale.
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