The meaning and types of stock

Stock, also known as inventory, refers to the materials and goods that a business holds to support its operations and meet customer needs.

Types of stock held by businesses

• Raw materials - Basic components or ingredients used in the production process.
• Work-in-progress - Items that are partially completed during production.
• Finished goods - Completed products ready for sale to customers.

Factors affecting stock levels and stock control methods

Businesses aim to keep stock levels as low as possible to reduce expenses, but various factors influence the amount of stock they hold.

Influences on maximum stock levels

• Warehouse size - Limited storage space restricts how much stock can be held.
• Opportunity cost - Money invested in stock could be used elsewhere.
• Production method:
  • Flow production often requires high levels of raw materials.
  • Batch production can result in significant work-in-progress.
  • Job production typically involves little or no finished goods stock.
  • Cell production usually employs just-in-time methods to keep stock minimal.

Minimum stock levels and related concepts

Businesses maintain a minimum amount of stock, known as buffer stock, to avoid shortages. The size of buffer stock depends on factors like available storage, the nature of the product, how quickly it is used, and lead time (the duration from placing an order to receiving the goods).

Key concepts in stock control:

• Re-order quantity - The specific volume of stock ordered from suppliers each time.
• Re-order level - The point at which stock falls low enough to trigger a new order.
• Stock control diagrams - Visual tools that plot stock levels over time, helping managers monitor patterns, predict needs, and adjust orders accordingly.

Benefits and costs of holding stock

Holding stock provides security against disruptions but comes with financial implications.

Benefits of holding buffer stock

• Preventing stockouts - Ensures a steady supply in competitive markets where delays could lose customers.
• Protection from changes - Guards against unexpected rises in demand or drops in supply availability.
• Economies of scale from bulk buying - Purchasing large quantities can secure supplier discounts, lowering unit costs.
• Competitive advantages - Reduced costs can be passed on through lower prices, helping large chains like supermarkets undercut smaller rivals.

Costs of holding too much stock

• Storage costs - Expenses for warehouse rent, utilities like heating and lighting, refrigeration for perishable items, and security measures.
• Wastage costs - Losses from damaged, spoiled, or outdated stock, especially in fast-changing sectors like fashion where trends shift quickly.
• Opportunity costs - Funds locked in stock cannot be invested in other areas.

Costs of running out of stock

• Production halts - Factories may stop work while still paying staff.
• Supply chain issues - A supplier's failure can affect multiple businesses.
• Other impacts - Includes missed sales opportunities, harm to the business's reputation, and expenses for customer compensation.

Lean production and just-in-time stock management

Lean production is a strategy focused on eliminating waste while using the fewest resources possible, without compromising product quality. It can involve practices like recycling materials internally to cut costs and maintain output levels, ultimately allowing for competitive pricing.

Just-in-time stock management

Just-in-time (JIT) is a key lean production technique that minimises stock by ensuring materials arrive exactly when required for use. In manufacturing, raw materials enter the process and exit as finished goods with little to no storage in between.

Advantages of just-in-time stock management

• Lower storage expenses - Reduces the need for large warehouses and associated costs.
• Better cash flow - Frees up money that would otherwise be tied in inventory for other uses.
• Reduced waste - Minimises spoilage, damage, or obsolescence by holding less stock.
• Increased flexibility - Allows quick adaptation to market changes.

Disadvantages of just-in-time stock management

• Dependence on suppliers - Requires reliable, frequent deliveries; any delays can halt operations.
• Organisational challenges - Involves complex planning and coordination, which can increase stress for employees.
• Missed bulk discounts - Prevents taking advantage of economies of scale from large orders.
• Vulnerability to disruptions - Unreliable suppliers or external issues can cause significant production stoppages.