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Originally published on June 29, 2022 Last updated on March 6, 2026

Shortage vs. Surplus: Causes and Definitions

Shortages and surpluses are similar in that they disrupt the flow of a business and can cause financial troubles and a loss of customers. However, they differ in numerous ways. The causes and solutions of shortages and surpluses are very different and require businesses to look within to determine what they can do to help […]
An empty shopping basket on an empty store shelf

Shortages and surpluses are similar in that they disrupt the flow of a business and can cause financial troubles and a loss of customers. However, they differ in numerous ways. The causes and solutions of shortages and surpluses are very different and require businesses to look within to determine what they can do to help prevent them in the future.

Many of the causes of surpluses and shortages are completely out of a business’s control. Manufacturing interruptions, delivery issues and changes in demand are some of the potential causes that are difficult to predict. However, internal causes can be easily remedied to limit the number of shortages and surpluses a business experiences.

Causes like supply management, marketing strategies and planning are all things businesses should focus on to prevent surpluses and shortages as much as they can. Continue reading for more information about shortages and surpluses and how Finale Inventory’s scalable inventory management system can help your business thrive.

  1. What Is a Surplus?
  2. Causes of a Surplus
  3. Effects of a Surplus
  4. How to Prevent a Surplus
  5. What Is a Shortage?
  6. Causes of Shortages
  7. Effects of Shortages
  8. How to Prevent a Shortage
  9. The Difference Between Shortages and Surpluses
  10. What About Equilibrium and Disequilibrium?
  11. Prevent Shortages and Surpluses With Finale Inventory
  12. Contact Finale Inventory Today

What Is a Surplus?

An inventory surplus refers to the products in a warehouse that are taking a long time to sell or are unsellable because the relevant time has passed for the products to sell or sell for the same value. Even if stock has not lost its value when it is first considered a surplus, the longer it sits unsold, the more its value decreases, which can hurt a business financially.

Causes of a Surplus

There are several scenarios that can cause an inventory surplus:

1. Inaccurate Demand Forecasting

It is important for businesses to have a system that predicts the demand they will experience over a certain period of time based on data and trends. However, if the data is inaccurate, it can lead to a business purchasing more inventory than they need, creating a surplus.

To prevent an inaccurate demand forecast, it is important to consider all internal and external factors that could affect sales. These factors could be anything from seasonal trends to economic fluctuations.

2. Poor Inventory Management

Poor inventory management happens when a company does not have a cohesive inventory management system or team. Everyone must be on the same page to prevent a surplus. When a team is not working together, inventory tends to stay in the warehouse longer due to miscommunications and other issues. That is when a surplus occurs.

3. Supplier Constraints

To some extent, whether a surplus occurs is out of your control. You likely have to work with a supplier for at least some part of your product. Sometimes, a supplier can cause issues in your workflow that end with you having an inventory surplus.

It could be because the supplier is unreliable or they ran into an issue out of their control with the supplies they need. A supply chain has a lot of moving pieces and does not always work as seamlessly as you hope, which is why it is important to plan for all types of scenarios.

Effects of a Surplus

A surplus has negative effects on a business, as the money put toward creating the product is not returned:

1. Costs

Having a surplus hurts a business financially, as the cost of creating the product and carrying the inventory is high. When that inventory is additional, the cost goes up — usually, businesses do not own the places where they keep inventory. There is also the cost of paying employees to manage inventory, the utilities for the warehouse and other expenses.

2. Demand Variability

Customers are hard to predict, and their demand for a product could change overnight. This can quickly leave a business with a surplus on its hands. Keeping a high amount of stock automatically puts a business at risk for loss due to demand variations. That is why it is important to have a detailed system for predicting demand.

3. Negative Cash Flow

Because products lose value over time, keeping a surplus of inventory will have a negative impact on a business’s cash flow and profit. The money kept in surplus inventory is money that could be used elsewhere in a business, which adversely affects business growth.

How to Prevent a Surplus

Because having a supply chain surplus leads to negative impacts on a business, it is helpful to know practical steps to take to avoid a surplus. Here are three ways to help prevent a surplus:

1. Automating Processes

Human error is inevitable in any process. That is why automating the inventory process is the best way to ensure data is accurate. Therefore, decisions made based on that data will lead to the correct amount of inventory. Automating the inventory process minimizes errors and increases efficiency quickly so you can see clear results fast.

2. Planning Ahead

Businesses that deal with surpluses regularly often simply need to re-evaluate their planning processes. To do this, businesses should analyze their end-to-end visibility through the supply chain process using real-time analysis. 

As was previously mentioned, inaccurate demand forecasting is one of the main causes of surpluses. Making changes to demand forecasting, such as automating the process, will greatly limit the amount of inaccurate demand forecasting errors that occur.

3. Marketing Strategies

Because there is no way to be accurate in a demand forecast down to the exact amount of inventory, implementing marketing strategies to make up for the difference can be helpful. If you have marketing strategies planned before you even launch a product in the event of a surplus, you will be able to seamlessly implement them when you find yourself with remaining inventory in your warehouse.

What Is a Shortage?

An inventory shortage happens when a business runs out of a product they are selling while consumers are still seeking to purchase it. Customers are hard to predict, and shortages happen when a business does not expect or appropriately plan for the amount of demand they receive for a certain product.

Causes of Shortages

There are several things that could cause an inventory shortage, including:

1. Ordering

Failing to order enough inventory is a major reason why a business would encounter an inventory shortage. This can come from inaccurate demand forecasting. However, inaccurate ordering can also occur because of an unorganized supply, which is something businesses can adjust to prevent future errors. Automating your process can help in the organization process.

2. Demand Fluctuations

Knowing what customers want is impossible to guess perfectly. Even if a business’s guess is close to accurate, demand is constantly changing. A variety of factors, such as holidays, economic conditions, trends and even the weather can affect the changes in demand. An unexpected increase in demand can leave a business with an inventory shortage.

3. Quality Control

Another cause of a shortage that is out of a business’s control is a quality control issue. If a business receives a round of inventory that has an issue caused by the manufacturer or in transit, there could be a pause in sales, as there is not enough quality inventory to sell to customers.

4. Delivery

The delivery process has a host of opportunities to be held up. Especially if the inventory is being transported from hundreds or thousands of miles away, it could encounter a number of issues that cause a delay in shipment. It is important to build in time for delays when preparing to sell a product. However, delays can extend beyond even that buffer time, leading to an inventory shortage.

5. Government Intervention

Sometimes, the government will cause a shortage if they impose a price ceiling on a product or another intervention. Doing so can cause different impacts on the supply chain, including suppliers choosing to pause or stop selling products.

Effects of Shortages

Like a surplus, a shortage has various negative impacts on a business:

1. Customer Loyalty

It is crucial to invest in customer loyalty throughout the buying process, as shortages are inevitable and can make your customers upset or disappointed. This is why it is important to give them the best overall experience — when there is some sort of hiccup, customers will be willing to work through it because of their positive feelings toward your business.

2. Reduced Profits

When a business is unable to meet customer demand, it misses out on the full profit it could’ve had with the appropriate amount of inventory. It also likely makes the time and money spent investing in a customer or on a marketing campaign an unnecessary expense.

How to Prevent a Shortage

There are several points to consider when determining how to prevent a shortage. Some overlap with the steps businesses should take to prevent surpluses, while some are unique to shortages:

1. Demand Forecasting

Once again, the importance of demand forecasting cannot be overstated. This will prevent many inaccuracies between inventory and demand. Though discrepancies are inevitable, having as few as possible will protect a business from losses due to shortages.

2. Safety Stock

For businesses to be able to prevent shortages to the best of their ability, it is important to have a safety stock. There are specific formulas to follow to calculate the amount of safety stock a business should have. Following these formulas is necessary to prevent a business from having a surplus rather than a shortage.

3. ABC Analysis

Using the ABC analysis method will help you categorize your inventory and keep it organized to know exactly how much inventory is available. The ABC analysis method organizes inventory based on importance and profitability to help break down the supply further and create the best data to forecast demand accurately.

Knowing which items in an inventory are the most valuable can help ensure there will not be a shortage with that product specifically. Though a business could still experience shortages, this sort of organization will help prevent some of them, which is beneficial to the business financially.

The Difference Between Shortages and Surpluses

Shortages and surpluses occur when supply and demand are not equal. However, there are differences between shortages and surpluses outside of their definitions. Consider the following:

Government Intervention

The government is sometimes involved in fixing both surpluses and shortages, but they have different methods to fix each one. To fix a surplus, the government will impose a price floor. A price floor implements a minimum price at which a product should be sold. If there is a shortage, the government will sometimes implement a price ceiling, which is a maximum price.

Self-Equilibrium Mechanism

Surpluses and shortages have different effects on consumers and the market. The difference is based on the market as a whole and the impact the shortage or surplus has on it.

What About Equilibrium and Disequilibrium?

A surplus causes businesses to lower their prices, which forces their competitors to do the same. In turn, the market experiences an increase in demand and moves toward price and quantity equilibrium.

A shortage will cause businesses to raise the price and quantity of a product. This may cause the business to lose some customers, but if enough are kept, the price increase will allow the business to achieve equilibrium.

Prevent Shortages and Surpluses With Finale Inventory

Finale Inventory offers a variety of services to help your business prevent surpluses and shortages as much as possible. One of the ways we do that is by helping you forecast demand accurately. Additionally, we offer comprehensive inventory management software to ensure your business can stay on top of its inventory.

Finale Inventory Demand Planning

Finale Inventory helps you plan for demand as accurately as possible. When demand planning, it is crucial to bring your staff together and make sure everyone is on the same page regarding how you are going to tackle inventory. You should have product portfolios, product forecasting and promotional plans prepared so the inventory software can have a clear picture of your business’s data. 

Finale Inventory Management Software

We have strived to build an inventory management solution that smooths out even the smallest detail to make the process simple from warehousing to selling.

Our inventory management software will provide the solutions your business needs to minimize surpluses and shortages. Schedule a live demo to see how our solutions fit with your business. On top of our inventory management solutions, we offer guided onboarding, training, and support.

Contact Finale Inventory Today

If you have any questions, fill out our contact form and we will get back to you as soon as possible. We look forward to hearing from you and exploring how we can keep your business from experiencing shortages and surpluses.

“The core of maturity, that I see, is starting with a unified view of inventory. I’ve got to be able to accurately represent what do I have, make sure that I know where it’s located so I can get it to my customers quickly.”

— Troy Graham, Descartes

What is the first thing I should fix if I want to scale operations?

Start with a unified view of inventory. The core of maturity starts with being able to accurately represent what you do have and make sure that you know where it’s located to get it to customers quickly. Without a unified view across your warehouses, 3PLs, and vendors, you cannot make the best decisions because you don’t have the best information at hand.

With Inventory Visibility, Businesses Can Make Smarter Allocation Decisions

Once inventory is centralized, businesses can move from reactive updates to intentional allocation. They can decide how much inventory to expose to each channel, when to use buffers, which marketplaces need extra protection, and how seasonality or campaign performance influence availability.

Once I know what inventory I have, how should I decide where to make it available?

Inventory allocation should reflect where orders are coming from, where marketing is working, and which channels carry the most risk. Once you know what you have and where it is located, you can think more strategically using centralized inventory to make prioritization happen automatically. One fertilizer company lost a little over 5,000 orders in one weekend because someone manually uploaded the wrong available inventory to Amazon.

Better Inventory Data Improves Planning, Purchasing, and Growth Bets

Better visibility turns inventory data into a planning tool. With insight into sales velocity, inventory levels, vendors, and channel performance, businesses can make more informed replenishment decisions, avoid overbuying, and test new product lines or vendor-supplied inventory without taking on unnecessary risk.

“You have to have unified inventory to know how to price your products just at that basic level. I can’t price my products if I don’t know the true cost to get it.”

— Mike Bernico, Flxpoint

How does better inventory data help me make smarter buying decisions?

It lets you measure whether your plan is working before you commit more capital. A key question becomes: “Did my plan work? Am I overleveraged in one place or another?” Centralized systems can also help businesses test new product lines or vendor relationships by looking at sales velocity by channel, allowing them to take risks in a calculated and measured way.

Intelligent Order Routing Turns Inventory Complexity Into Automation

Once inventory and supplier data are reliable, businesses can automate fulfillment decisions. Orders can be routed based on cost, speed, margin, location, warehouse priority, vendor fallback, split-shipment rules, or customer expectations. This helps hybrid fulfillment scale because every order does not need a manual review.

How do I decide the best way to fulfill each order?

There is no single answer, which is why order routing needs to account for the context of each order. Intelligent order routing is not just sending an order to someone who has stock; it is taking each and every order and treating it like its own unique use case. Depending on the order, the business may prioritize speed, margin, an internal warehouse, vendor fallback, or preventing split shipments.

Supplier Inventory Sync Extends Inventory Beyond the Four Walls

For hybrid fulfillment to work, supplier inventory needs to become part of the operating model. Supplier sync does not always require advanced technology; it can happen through automated files, FTP, email, APIs, EDI, or ecommerce storefront integrations. The key is replacing manual updates with automated, reliable supplier data.

Can supplier inventory really be treated like part of my own inventory?

Yes, but the goal is not necessarily to force every supplier into a complex integration. Real-time supplier sync can be defined as any way to get an automated update from a supplier, such as Google Sheets, email, FTP, API, EDI, or ecommerce storefront connections. The key is that accurate supplier stock is foundational. If you don’t have an accurate view of what is in stock with your suppliers, you cannot tell your sales channel accurately what’s available.

Exception-Based Workflows Keep Humans Focused Where They Matter

Automation does not remove people from the process. Mature operations let technology handle the routine majority while humans focus on exceptions, such as high-value orders, fraud risk, compliance requirements, restricted products, export rules, or unusual fulfillment scenarios.

If my business has special cases, can automation still work?

Yes. The point is not to automate every possible decision; it is to automate the routine work and surface the exceptions. Businesses should not have to look at every single order. Instead, technology can highlight high-value orders, risky locations, or compliance requirements. The goal is to take care of the 80% of workflows that are obvious while still allowing human review when specific exceptions arise.

The Right Inventory Technology Should Fit the Business, Not Overwhelm It

Software decisions should be based on business fit, not popularity, feature volume, or broad “all-in-one” promises. Growing ecommerce businesses should identify their highest-impact bottleneck, prioritize what matters now, and choose technology that is right-sized but flexible enough to support future phases of growth.

How should I choose software without overbuying or picking the wrong system?

Start with your priorities, not the biggest feature list. Avoid an all-in-one system that claims to “do everything under the sun” and look for a “best of breed approach” with systems that can scale as you add channels or vendors. The practical advice is to stack rank what matters now, make sure the system can support future phases, and choose technology that fits your business rather than overwhelming it.

How to Scale Ecommerce Operations Beyond Spreadsheets

For many growing ecommerce businesses, Finale and Flxpoint work together as a practical answer to these challenges. Finale helps centralize and manage internal inventory, purchasing, warehouse operations, and stock visibility, while Flxpoint helps connect vendor inventory, automate supplier sync, and route orders across hybrid fulfillment networks. Together, they give businesses a best-of-breed way to improve inventory accuracy, reduce spreadsheet work, and scale fulfillment without forcing every process into a one-size-fits-all system.

Ecommerce Fulfillment Operations FAQ

What Is Ecommerce Fulfillment Operations?

Ecommerce fulfillment operations are the processes that move an online order from purchase to delivery. This includes managing inventory, syncing product availability across channels, routing orders to the right warehouse, 3PL, supplier, or vendor, and making sure the customer receives the right product on time. As discussed in the webinar, fulfillment is no longer limited to “what’s in my warehouse these days”; growing businesses may rely on internal warehouses, 3PLs, marketplace fulfillment services, and supplier inventory at the same time.

What Are Ecommerce Fulfillment Operation Examples?

Examples of ecommerce fulfillment operations include updating inventory across Shopify, Amazon, Walmart, and other sales channels; allocating inventory to specific marketplaces; sending orders to an internal warehouse, 3PL, or vendor; syncing supplier inventory through files, APIs, EDI, email, or FTP; replenishing warehouse stock based on sales velocity; and flagging exceptions such as high-value orders, compliance requirements, or restricted products. In the webinar, the speakers also discussed hybrid fulfillment examples where a business may fulfill some products from its own warehouse and use vendors as a fallback or extension of available inventory.

How Can I Track My Inventory at an Ecommerce Fulfillment Center?

The best way to track inventory at an ecommerce fulfillment center is to create a unified inventory view that shows what is available, where it is located, and how that inventory connects to each sales channel. That means tracking inventory across internal warehouses, fulfillment centers, 3PLs, marketplace fulfillment programs, and supplier locations instead of relying on disconnected spreadsheets. The webinar emphasized that businesses need to “accurately represent” what they have and know where it is located so they can get products to customers quickly.

How Can I Connect My Inventory to My Supplier?

You can connect supplier inventory through several methods, depending on what the supplier supports. The webinar discussed low-tech and advanced options, including automated Excel or CSV files, Google Sheets, email updates, FTP servers, APIs, EDI, and direct connections to ecommerce storefronts such as Shopify, BigCommerce, or Magento. The key is to ask suppliers how they share inventory today, then use a system that can automate that data flow instead of manually copying supplier inventory into spreadsheets.

What Is Ecommerce Order Routing?

Ecommerce order routing is the process of deciding where an order is fulfilled from after a customer buys. In a simple operation, every order may go to one warehouse. In a more complex or hybrid fulfillment model, the best fulfillment source may depend on inventory availability, shipping speed, cost, margin, customer location, warehouse priority, vendor fallback rules, or whether the order should be split. The webinar described intelligent order routing as treating each order like its own use case, so businesses can automate the best fulfillment decision without manually reviewing every order.

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