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Everything You Need to Know About Safety Stock

Are you looking to determine the optimal inventory to best support your service? Then you need to understand everything about safety stock! This article provides a detailed explanation of what safety stock is, its importance, how to calculate it, and how to determine the best approach.

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What is Safety Stock?

Many retailers maintain inventory to meet regular demand and avoid extended delays. These inventories may include all product ranges or focus on highly demanded items. However, even with sufficient stock to fulfill orders on time, unforeseen events or market conditions can disrupt regular operations and jeopardize stock levels. To mitigate such risks, businesses often implement safety stock.

Also known as buffer stock, safety stock helps prevent stock outs caused by external fluctuations. It is part of a broader strategy to account for market and demand fluctuations. While it is impossible to predict every variation, it’s helpful to anticipate potential risks that could affect your retail sector.

Both retailers and suppliers should consider safety stock, as both are vulnerable to different uncertainties that could affect their operations. For retailers, especially in large-scale distribution, it ensures continuous service. For suppliers, safety stock is even more crucial since a total production halt could be disastrous.

Why Implement Safety Stock?

As mentioned, safety stock serves as a defense against external uncertainties, which can be divided into two main categories: product-related uncertainties and demand-related uncertainties.

Product-Related Uncertainties

These uncertainties are numerous and can occur unexpectedly. They include:

  • Maintenance periods
  • Order lead times
  • Production delays
  • Transit time
  • Customs clearance
  • Delivery times

Given the high level of unpredictability, businesses must be prepared to act accordingly in all situations. Safety stock acts as a cushion during these periods, preventing shortages or overstocking while waiting for normal conditions to resume. This is even more common if you produce or import goods from abroad, where multiple uncertainties can arise simultaneously.

Demand-Related Uncertainties

Market and demand fluctuations can also cause uncertainty since customer preferences are often volatile. Demand for one of your products might suddenly surge or drop in a short period. Safety stock allows you to adjust quickly to such changes. These fluctuations can be triggered by media coverage, current events, climate anomalies, competitors’ promotions, or seasonality. Such factors make it crucial to have buffer stock to handle these variations.

Risks of Safety Stock

Although safety stock may seem like the perfect solution to unexpected events, it also presents risks. Holding a portion of your inventory comes with costs and potential challenges. Safety stock should not compensate for poor logistical planning. If issues are recurring, they should be addressed at their root; safety stock should only cover unexpected events. Otherwise, it could exacerbate existing structural problems.

Additionally, large safety stock levels can increase storage costs. The more products you hold, the more you will pay for warehousing, maintenance, transport, and storage. Improper use of safety stock can create a vicious cycle that worsens problems rather than resolving them. Dependency on safety stock could make you more vulnerable to external factors rather than protecting you from them. Therefore, balancing your logistics and commercial strategy is essential.

Key Factors to Consider When Determining Safety Stock

When determining safety stock in retail, it’s crucial to account for various elements that influence both demand and supply uncertainties. Striking the right balance ensures you can meet customer needs while minimizing risks of stockouts or excess inventory.

Storage Costs vs. Opportunity Costs

While storing products can be expensive, as it ties up cash without immediate returns, it’s essential to think long-term. These short-term losses might be necessary for securing higher margins later. Missing sales due to stockouts or shortages can harm your revenue and brand image. You need to weigh opportunity costs—the potential earnings from meeting unexpected demand—against storage costs. If opportunity costs are higher than storage costs, you can increase safety stock; otherwise, you may want to reduce it.

Levels of Uncertainty

Not all products are exposed to the same risks. Differentiate your products based on how external factors affect demand. For items with highly variable demand, maintaining a higher safety stock is advisable. Do not apply a single safety stock strategy across all product categories; tailor it to each product’s characteristics.

Service Level Expectations

Your sector and brand reputation will influence customer expectations for service levels. Safety stock should align with those expectations. If you promise one-day delivery, your safety stock strategy will differ from a smaller business with flexible delivery terms. Failing to meet delivery promises can damage customer trust, hurt your brand image, and lead to lost market share.

How to Calculate Safety Stock

Calculating safety stock is crucial for meeting customer demand despite supply chain variability, preventing stockouts, and balancing inventory to optimize service while minimizing excess stock and costs.

Pareto Principle and ABC Method

In most cases, safety stock is not applied across the entire product catalog. Businesses often use the Pareto principle to identify which products to focus on. This principle suggests that 80% of a business’s results come from 20% of its products or services. This approach categorizes products into three groups: A, B, and C, based on their value relative to the total inventory.

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ABC Categories with Pareto Principle:

  • Category A: These are the high-performing products that contribute most to revenue. Most of your safety stock should focus on these items to ensure continuity in case of shortages.
  • Categories B and C: While these products are still important, they contribute less to revenue and may require a smaller portion of your safety stock. However, do not neglect them, as they represent potential future growth.

Advances in forecasting tools modern solutions now offer more accurate methods for forecasting sales and calculating safety stock, moving beyond traditional formulas. These tools take into account real-time data and advanced analytics, allowing for more precise stock management, minimizing risks, and adapting to fluctuations in demand.

Various Calculation Methods

Despite the advancements, several basic approaches are still commonly used:

  • Basic Method: Multiply your average sales by a chosen safety period (e.g., 5 days or a week).
    • Safety Stock = Average Sales × Safety Period
  • Average-Max Method: Base this on past variations and apply a formula that accounts for maximum sales and lead times.
    • Safety Stock = (Max Lead Time × Max Sales) – (Average Lead Time × Average Sales)
  • Normal Distribution Method: This method uses normal distribution to estimate safety stock, building more accurate projections by factoring in demand fluctuations. However, it may not account for seasonality or extreme cases and is more applicable to higher sales volumes.

Order Point

Once you’ve calculated your safety stock, the next key calculation is the order point. The order point, also known as the reorder point, is the threshold at which you need to replenish stock. It sits just before the safety stock and acts as an alert for when to restock.

  • Order Point = (Average Sales × Lead Time) + Safety Stock

Using AI for Pricing and Inventory Management

To ensure profitability and avoid stockouts that hurt sales and brand image, consider using a pricing solution that incorporates artificial intelligence (AI). AI-based pricing solutions, like those offered by PricingHUB, continuously assess market conditions, product elasticity, and stock levels to provide real-time price adjustments based on your commercial objectives. This ensures that pricing strategies are optimized according to stock variations, helping to maintain optimal safety stock and pricing strategies. To learn more, request a free demo with one of our experts.

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