Inventory Management_v1

Inventory Management

What is Inventory?

  • Stock of goods in different forms: raw materials, component parts, work-in-process, finished products.

  • Held at various locations in the supply chain.

  • Collectively known as inventory for the business.

What is Inventory Management?

  • Involves planning, organizing, handling, and storing adequate inventory levels at optimized costs to meet customer demand.

  • Two significant costs involved: ordering costs and carrying costs.

Ordering Costs:

  • Expenses incurred to create and process orders to suppliers.

    • Cost of preparing purchase orders.

    • Labor costs for inspecting received goods.

Carrying Costs:

  • Total cost of holding inventory, including:

    • Warehousing costs (rent, utilities, salaries).

    • Financial costs (opportunity costs).

    • Inventory costs related to perishability, shrinkage, and insurance.

Importance of Inventory Management:

  • Occupies 50-60% of total current assets of a business.

  • Essential for working capital management (liquidity) and production management.

Objectives of Inventory Management

  • Maintain optimum inventory levels to maximize profitability and reduce costs.

  • Meet seasonal product demand.

  • Plan purchase sources and timings.

  • Avoid overstock and understock scenarios.

  • Ensure efficient production.

Functions of Inventory Management

  • Meet anticipated demand.

  • Decouple operations through work-in-progress (WIP).

  • Protect against stock-outs.

Inventory Turnover

  • Represents the rate at which a company sells and replaces its stock in a given period.

  • Inventory Turnover Ratio Formula: Cost of Goods Sold / Average Inventory.

  • Indicates sales strength; low turnover implies weak sales or excess inventory, while high turnover indicates strong sales or insufficient inventory.

  • Formula: Inventory Turnover = Sales / Average Inventory.

Effective Inventory Management Strategies

  • Maintain a system for tracking inventory.

  • Reliable demand forecasts.

  • Knowledge of lead times.

  • Reasonable estimates of holding, ordering, and shortage costs.

  • Classification system for inventory.

Types of Inventory

Raw Materials

  • Items used in the manufacturing process to create components or finished products.

Work-in-Process (WIP)

  • Includes materials and components in production but not yet completed.

  • Represents items between raw material and finished goods status.

Finished Goods

  • Completed products ready for sale, having passed inspection.

Transit Inventory

  • Items in movement from one location to another, often referred to as pipeline inventory.

Buffer Inventory

  • Safety stock held to manage uncertainties in supply and demand.

  • Protects against stock-outs and enhances customer service.

Anticipation Inventory

  • Excess inventory held in anticipation of future events (e.g., seasonal demand spikes).

  • Allows for smoother production processes during demand fluctuations.

Decoupling Inventory

  • Inventory that acts as a shock absorber between production stages, ensuring workflow continuity.

Cycle Inventory

  • Reflects the inventory available to meet normal demand within a specific time frame.

  • Associated with expected sales based on demand forecasts.

Difference Between Safety Stock and Buffer Stock

  • Both terms often confused; however:

    • Buffer stock protects the customer from variability in supply.

    • Safety stock protects against failures in upstream processes and supplier issues.

Maintenance, Repair, and Operating (MRO) Goods

  • Items used to sustain production without becoming part of the finished product.

    • Examples include lubricants, tools, and office supplies.

Inventory Management in IT Terms

  • Active control program for managing sales, purchases, and payments.

  • Software aids in invoice creation, order processing, and label printing.

Reasons for Inventory Management

Benefits for Trading Firms

  • Allows sales activities to continue despite interruptions in procurement.

Benefits for Manufacturing Firms

  1. Uninterrupted Production Schedule:

    • Ensure raw material availability to prevent halting production.

  2. Independent Sales Activity:

    • Maintain finished goods stock to fulfill orders promptly.

Cost of Inventory: Key Considerations

  1. Carrying Cost:

    • Costs associated with storing inventory, including storage space, insurance, and handling.

  2. Ordering Cost:

    • The cost related to creating and processing orders.

  3. Stock-Out Costs:

    • Costs incurred when demand exists but inventory is insufficient.

Stock Levels

  • Reorder Level: Level at which fresh supplies should be ordered.

    • Formula: Reorder Level = Minimum Level + Consumption during lead time.

  • Minimum Stock Level: Ensures availability of stock before orders can be placed.

  • Maximum Stock Level: Prevents overstocking, saving working capital and maintaining material quality.

Control Chart for Inventory Levels

  • Visual representation of maximum, minimum, and reorder levels against time to prevent stock-outs.

Danger Level

  • Level below the minimum threshold necessitating urgent action to replenish stock to avoid production disruptions.

Inventory Counting Systems

  1. Perpetual Inventory System:

    • Updates records in real-time, reflecting current inventory status.

  2. Periodic Inventory System:

    • Updates inventory levels at set intervals through physical counts.

  3. Two-Bin System:

    • Relies on two bins for replenishing stock; when one is empty, orders are placed while using the second.