How does Just-in-Time (JIT) stock management differ from Just-in-Case (JIC) in terms of capital?

JIT improves cash flow by reducing the amount of money tied up in idle inventory, whereas JIC requires significant capital to be invested in buffer stocks. This makes JIT more financially efficient but potentially riskier.

What is the primary difference between raw materials and component stock?

Raw materials are natural resources or basic goods that require processing (e.g., iron ore), while components are already-manufactured parts ready to be assembled into a final product (e.g., a car engine).

In terms of supplier relationships, how do JIT and JIC differ?

JIT requires an extremely close and trusted relationship with flexible suppliers who can deliver frequently. JIC is less dependent on immediate supplier performance because the buffer stock provides a safety net.

Why is it a common error to assume that Just-in-Time (JIT) always results in the lowest total costs?

While JIT reduces storage costs, it often increases administrative and delivery costs due to the high frequency of small orders. Additionally, JIT users miss out on bulk-buying discounts available to JIC users.

What mistake do students often make when evaluating the risks of high stock levels?

They often focus only on the cost of renting a warehouse. However, they should also consider the 'opportunity cost' of tied-up capital and the risk of obsolescence, where goods become unsellable due to market changes.

Why is 'holding too little stock' often incorrectly viewed as only a lost sale?

A stockout can also lead to production stoppages where staff and machinery are idle but still incurring costs. This leads to underutilised capacity and higher unit costs across the business.

What is the definition of 'Buffer Stock'?

Buffer stock is an extra quantity of inventory held as a safety margin to protect against unexpected increases in demand or delays in the delivery of new supplies from vendors.

Define 'Work-in-Progress' (WIP) in a manufacturing context.

Work-in-progress refers to products that are currently on the production floor in an intermediate state; they are no longer raw materials but are not yet finished goods ready for sale.

What is meant by the term 'Stockout'?

A stockout occurs when a business runs out of inventory and is unable to meet customer orders or continue production, often resulting in lost revenue and damaged customer relationships.

Why does a Just-in-Time (JIT) system require high-quality materials from suppliers?

Since there is no buffer stock, any defective materials delivered would immediately halt production. In a JIT system, there is no 'spare' stock to replace faulty items, making quality control at the source vital.

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Managing Stock

Summary

Stock management, or inventory control, is the strategic process of overseeing the flow of goods and materials into and out of a business. It involves balancing the costs of holding inventory against the risks of running out, ensuring that production remains continuous and customer demand is met efficiently.

1. Definition & Stock Classification

Stock (Inventory) refers to the materials and goods a business holds for production or resale to customers.
Raw Materials are the basic natural resources or components that have not yet been processed, such as timber for furniture or flour for a bakery.
Work-in-Progress (WIP) consists of items currently in the production stage that are partially finished but not yet ready for sale.
Finished Goods are completed products ready for distribution and sale to the end consumer.
Components are manufactured parts used in the assembly of a larger product, such as microchips for a laptop.

2. The Dynamics of Stock Levels

Holding Too Much Stock creates significant financial pressure through high storage costs, insurance, and the risk of spoilage or obsolescence.
Opportunity Cost is a major factor in excess inventory, as capital tied up in stock cannot be invested in other productive areas of the business.
Holding Too Little Stock leads to a stockout, which can cause production line stoppages and a failure to meet customer orders.
Reputational Risk arises when a business consistently fails to satisfy demand, leading customers to switch to competitors who have items readily available.

A sawtooth diagram showing the cycle of stock levels over time, highlighting the maximum stock level, the reorder point, and the safety or buffer stock held to prevent stockouts.

3. Just-in-Case (JIC) Strategy

4. Just-in-Time (JIT) Strategy

5. Key Distinctions: JIT vs JIC

6. Exam Strategy & Tips