Stock control

Welcome to the World of Stock Control!

In this chapter, we are diving into Stock Control. This is a vital part of the Productive Efficiency section of your OCR A Level Business course. Whether you're running a tiny corner shop or a massive car factory, managing your "stuff" (stock) correctly is the difference between making a huge profit or going bust. We’ll look at how businesses keep just the right amount of stock to keep things moving without wasting money.

1. What exactly is Stock Control?

Stock (also known as inventory) refers to the materials and goods a business holds to facilitate production or to satisfy customer demand. Stock control is the process of making sure that the right amount of stock is available at the right time.

Businesses usually hold three types of stock:

1. Raw Materials: Components waiting to be used in production (e.g., flour in a bakery).
2. Work-in-Progress (WIP): Semi-finished goods (e.g., a car chassis on an assembly line).
3. Finished Goods: Products ready to be sold to the customer (e.g., a boxed laptop).

The Balancing Act

Think of stock control like your fridge at home. If you buy too much milk, it goes off and you waste money (holding costs). If you don't buy enough, you can't have your morning cereal and you're unhappy (stock-out costs). Businesses face this same dilemma every day!

Quick Review:
- Holding Costs: Storage, insurance, and the risk of stock going out of date.
- Stock-out Costs: Lost sales, disappointed customers, and idle machinery.

2. The Stock Control Chart

One of the most important tools you need to master is the Stock Control Chart. Don't worry if it looks like a zig-zag at first—it's actually quite simple once you know the parts!

Key Components of the Chart:

- Maximum Stock Level: The highest amount of stock a business is able or willing to hold.
- Minimum (Buffer) Stock Level: The "emergency" reserve kept just in case there’s a delay in delivery or a sudden spike in demand.
- Reorder Level: The specific point (quantity) at which a business places a new order for more stock.
- Reorder Quantity: The amount of stock actually ordered from the supplier.
- Lead Time: The time it takes between placing an order and the stock actually arriving.

Step-by-Step: How it works

1. Stock levels fall as the business uses materials in production.
2. When stock hits the Reorder Level, the manager calls the supplier.
3. During the Lead Time, the business continues to use its remaining stock.
4. Just as the stock is about to hit the Buffer level, the new delivery arrives and stock shoots back up to the Maximum Level.

Analogy: Think of your phone battery. You might decide to plug it in (Reorder Level) when it hits 20%. The hour it takes to charge is the Lead Time. The 20% you have left while it's charging is your Buffer Stock!

Key Takeaway: Effective stock control charts help a business avoid "stock-outs" while ensuring they aren't spending too much on storage.

3. Methods of Stock Control

Different businesses use different methods depending on how much they produce and how reliable their suppliers are.

Just in Time (JIT)

JIT is a method where stock arrives exactly when it is needed for production. The goal is to hold zero stock (or very close to it). This is a pillar of Lean Production.
- Pros: Massive savings on storage; less waste.
- Cons: Requires 100% reliable suppliers and zero room for error.

Kanban

A Kanban system uses physical or electronic "signals" to trigger the movement of stock. For example, an empty bin or a card is sent back to the previous stage of production to say "We need more!" This ensures parts are only made when there is demand.

Fixed Reorder Stock Level vs. Fixed Time Reordering

- Fixed Reorder Level: You order more whenever stock hits a certain number (e.g., "Order more when we have 50 units left").
- Fixed Time Reordering: You order more at set intervals (e.g., "Every Tuesday morning, we top up the stock to the maximum level").

Economic Order Quantity (EOQ)

The EOQ is a mathematical approach to find the "sweet spot" for order sizes. It calculates the exact quantity to order that minimizes the total cost of both ordering (admin/delivery) and holding stock.

Electronic Methods

Modern businesses use technology like Barcodes and RFID tags. These allow for real-time tracking, meaning the computer can automatically place an order the second a product is scanned at the till. This is often called Electronic Point of Sale (EPOS).

Did you know?
Amazon uses massive electronic stock control systems that allow robots to find items in warehouses in seconds, keeping their "lead time" for customers incredibly low!

4. Stock Control and Production Methods

The way a business makes its products (Job, Batch, or Flow) changes how it manages stock.

- Job Production: Usually requires specific, one-off stock. Stock levels might be low, but the cost per item is high.
- Batch Production: Requires stock for a whole group of products. Stock control is trickier here as you need to switch between different materials.
- Flow Production: This is where JIT and Stock Control Charts are most common. Because the factory never stops, a "stock-out" would be a disaster, costing thousands of pounds every minute the line is idle.

Key Takeaway: Stock control must be tailored to the production method to ensure Productive Efficiency.

5. Impact and Importance: Why bother?

Why is the OCR syllabus so obsessed with stock? Because it hits the Bottom Line (Profit!).

The Importance of Good Stock Control:

1. Improves Cash Flow: Money tied up in a warehouse is money that can't be used to pay workers or buy new machines.
2. Reduces Waste: Especially important for perishable goods (food) or fast-moving tech (which becomes obsolete quickly).
3. Customer Satisfaction: If you have it in stock, you can sell it. If you don't, they’ll go to your competitor.
4. Efficiency: Smooth stock levels mean the production line never has to stop and wait for a delivery.

Common Mistakes to Avoid:
- Don't assume "More stock = Better." Too much stock increases your opportunity cost (you could have spent that money elsewhere).
- Don't forget the Buffer. Relying on JIT without a "Plan B" can lead to disaster if there is a strike or a snowstorm that stops deliveries.

Summary: The Quick Check-List

- Can you define Lead Time and Buffer Stock?
- Can you explain why JIT helps with Productive Efficiency?
- Do you understand that the Reorder Level is a quantity, not a time?
- Can you identify one electronic method of stock control?

Don't worry if this seems like a lot of terms! Just remember: Stock control is simply about having the right stuff, in the right place, at the right time. Master the chart, and you've mastered the chapter!