Long Way Education

By Dr. Mohamed Sobih

PhD, FHEA

Contact the author: drsobeih@gmail.com

Effective inventory management is important for the successful operations and supply chains of most businesses. This is because inventory management impacts operations, marketing, and finance. Poor inventory management hampers operations, diminishes customer satisfaction, and increases operating costs. Here, the meaning of inventory, its importance, kinds, cost, and classification system are illustrated. A solved example is provided to demonstrate the A-B-C classification system. Moreover, you will learn the inventory ordering policies.

A successful inventory management system is essential to your company’s success. Image source: cntraveler.com

Introduction

Inventory is one of the most important components in complex supply chain management. Imagine a retail store without products on its shelves or a manufacturer halting production due to a shortage of raw materials. In both scenarios, the culprit is inadequate inventory management. Any successful business operation revolves around effective inventory management. It ensures that the right products are available at the right time, in the right quantities, and at the right cost.

Understanding the Meaning of Inventory

Inventory represents a company’s investment in assets intended for sale or future use in the production process. Inventory encompasses all goods and materials that a company holds for resale, production, or delivery services. Inventory includes raw materials, work-in-progress, finished goods, and supplies necessary for day-to-day operations.

It’s important to manage inventory, as it represents a significant portion of a company’s current assets and working capital, with up to 90 percent of the latter invested in it.

The percentage of inventory from a firm’s assets and capital.

To meet customer demand without interruption, companies use inventory as a buffer between supply and demand. It allows companies to smooth out demand fluctuations, respond to unforeseen market changes, and capitalize on opportunities as they arise. Without adequate inventory, businesses risk losing sales, damaging their reputation, and ultimately jeopardizing their long-term viability.

Recognizing the Importance of Effective Inventory Management

The importance of effective inventory management can’t be overstated. It links suppliers and consumers across the supply chain, facilitating the efficient flow of materials and goods during manufacturing and distribution.

Effective inventory management is about finding the delicate balance between supply and demand. It involves accurately forecasting demand, optimizing inventory levels, minimizing stockouts and overstock situations, and maximizing inventory turnover. By doing so, businesses can reduce costs, improve cash flow, enhance customer satisfaction, and gain a competitive edge in the marketplace.

Exploring the Kinds and Costs of Inventory

Inventory comes in various forms, each serving a specific purpose within the supply chain.

1. Raw materials: These are the basic inputs used in production. Examples include steel for a manufacturing plant or fabric for a clothing manufacturer.
2. Work-in-process (WIP): Work-in-process represents partially completed products that are still undergoing the manufacturing process. This includes items that are being assembled, processed, or transformed into finished goods.
3. Finished goods: items prepared for consumer purchase. They have completed production and are awaiting distribution to retailers or end consumers.
4. Maintenance, Repair, and Operating (MRO) Supplies: These are supplies necessary for day-to-day operations, such as office supplies, spare parts, and consumables.

The costs associated with inventory extend beyond the purchase price alone. They encompass a range of expenses, including:

• Storage Costs: These include expenses related to warehousing, shelving, and maintaining inventory storage facilities.
• Handling Costs: Expenses associated with receiving, storing, picking, packing, and shipping inventory.
• Insurance: Businesses often incur insurance costs to protect their inventory against loss, theft, damage, or other unforeseen events.
• Obsolescence: Inventory that becomes obsolete or expires represents a loss for businesses, as they may be unable to sell it at full value.
• Opportunity Cost: Tying up capital in inventory comes with an opportunity cost, as the funds could have been invested elsewhere to generate a return.

By understanding the different types of inventory and their associated costs, businesses can make informed decisions to manage inventory effectively and efficiently.

Understanding Inventory Classification Systems

To manage inventory effectively, businesses often classify inventory by criteria such as value, demand variability, and criticality. One commonly used classification technique is ABC analysis, which categorizes inventory into three groups based on their relative importance. These three categories are,

1. Category A: These items have a high value and represent a significant portion of total inventory costs (60% to 70%). They are typically characterized by high demand variability and require careful attention and management.
2. Category B: These items have a moderate value and demand variability. While they may not be as critical as Category A items, they still require regular monitoring and control to ensure optimal inventory levels.
3. Category C: Category C items have a low value and demand variability. They represent a smaller portion of total inventory costs (10% to 15%) and can often be managed with less oversight.

Classifying inventory in this way enables businesses to prioritize their resources and focus their attention on items that have the greatest impact on overall performance.

Inventory Ordering Policies and Models

One of the fundamental questions in inventory management is “how much to order and when to order.” To answer these two questions, businesses employ various inventory ordering policies and models, each tailored to their specific needs and circumstances.

An economic order quantity model can be used to answer the question “how much to order?” By minimizing the total of specific yearly costs that vary with order size and frequency, the economic quantity models determine the optimal order quantity.

The Basic Economic Order Quantity (EOQ) Model

A popular method for managing inventory is the Economic Order Quantity (EOQ) model, which determines the optimal order quantity to minimize annual inventory costs. The EOQ formula takes into account the costs of holding inventory (holding costs) and the costs of ordering inventory (ordering costs), balancing the two to find the most cost-effective order quantity. Given below is the EOQ formula:

Where:

1. EOQ is the economic order quantity.
2. D is the annual demand in units.
3. S is the order cost per order.
4. H is the holding cost per unit per year.

The Economic Production Quantity (EPQ) Model

The appropriate order quantity or production lot size is paramount in production planning. This critical information can be derived through the economic production quantity model, a widely utilized tool in production management. Even within assembly operations, tasks are often carried out in batches, which can increase capacity to produce items beyond their usage or demand in certain situations. Therefore, inventory will continue to grow if production continues. In such cases, it makes sense to periodically produce these items in batches or lots rather than continuously. The following is the EPQ formula.

Where:

1. EPQ is the economic order quantity.
2. D is the annual demand in units.
3. S is the order cost per order.
4. H is the holding cost per unit per year.
5. p is the production or delivery rate.
6. U is the usage rate.

The Quantity Discount Model

Price discounts are offered to customers for large orders to encourage bulk purchases. In such circumstances, the potential benefits of lower purchasing prices and fewer orders that will result from purchasing in bulk must be weighed against the increase in carrying costs resulting from higher average inventories. The buyer uses quantity discounts to determine the order quantity that minimizes total cost, defined as the sum of carrying, ordering, and purchasing expenses.

Businesses can minimize costs while ensuring sufficient inventory to meet demand by using the appropriate EOQ model.

Just-In-Time (JIT) Inventory System

The Just-In-Time (JIT) inventory system is another popular approach to inventory management that aims to minimize inventory levels by synchronizing production with customer demand. In a JIT system, inventory is ordered and produced only as needed, eliminating excess inventory and reducing waste.

The key principles of JIT inventory management include:

1. Demand-Pull Production: Production is based on customer demand, with stock replenished only as needed.
2. Continuous Improvement: JIT emphasizes continuous improvement in processes, quality, and efficiency to reduce lead times and increase responsiveness.
3. Supplier Partnership: Close relationships with suppliers are essential in a JIT system, as on-time material delivery is critical to maintaining production schedules.

Businesses can reduce carrying costs, improve cash flow, and increase efficiency by implementing a JIT inventory system.

Other Inventory Ordering Policies

In addition to the EOQ model and JIT inventory systems, businesses may use several other inventory ordering policies and models, depending on their specific needs and circumstances. These include:

• Reorder Point (ROP): The reorder point is the inventory level at which a new order should be placed to replenish stock before it runs out. It is calculated from the lead time (the time required to receive an order) and the average demand over that period.
• Safety Stock: Safety stock is extra inventory held to protect against fluctuations in demand or supply. It acts as a buffer to keep things running smoothly and avoid stockouts.
• Periodic Review System: In a periodic review system, stock levels are checked at regular intervals, and replenishment requests are placed as needed. This approach enables companies to consolidate orders and realize economies of scale.

Conclusion

Effective inventory management is a cornerstone of business success. Understanding inventory, recognizing its importance, exploring its various types and costs, implementing classification systems, and adopting appropriate ordering policies and models enable businesses to manage inventory effectively, optimize operations, and gain a competitive edge in today’s dynamic marketplace.

From raw materials to finished goods, inventory plays a vital role in the supply chain, ensuring that products are available when and where they are needed. Effective inventory management results in reduced costs, improved cash flow, increased customer satisfaction, and ultimately long-term success.

The importance of effective inventory management will increase in the future as consumer expectations and technological advancements both continue to rise. For businesses to successfully position themselves in an increasingly competitive global economy, they must stay up to date with the latest trends and best practices in inventory management.

©Dr. Mohamed Sobih, 2024

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