{"id":774,"date":"2026-04-20T15:23:48","date_gmt":"2026-04-20T09:53:48","guid":{"rendered":"https:\/\/www.spxcommerce.com\/blog\/?p=774"},"modified":"2026-04-20T15:34:03","modified_gmt":"2026-04-20T10:04:03","slug":"inventory-forecasting-methods-tools","status":"publish","type":"post","link":"https:\/\/www.spxcommerce.com\/blog\/inventory-forecasting-methods-tools\/","title":{"rendered":"Inventory Forecasting: Best Methods, Tools & Software for Retailers"},"content":{"rendered":"

Retailers operate in an environment where every stock decision impacts revenue, customer satisfaction, and efficiency.\u00a0<\/span><\/p>\n

Excess inventory is costly in terms of working capital and storage expenses, and insufficient inventory is costly through stockouts, lost sales, and diminished customer confidence. Having intuition is not enough to strike a balance between these results, and it takes planned, data-driven approaches with the help of<\/span> inventory forecasting software<\/span>.<\/span><\/p>\n

Inventory forecasting adds some predictability to this process by transforming past sales data, demand trends, and operational parameters into actionable insights. Retailers can make better purchasing and replenishment decisions by estimating future demand at the SKU level and balancing it against supply constraints, including lead times and safety stock requirements.\u00a0<\/span><\/p>\n

The outcome is a more secure supply chain, with products more readily available and inventory costs better handled.<\/span><\/p>\n

In this guide, the fundamentals, procedures, instruments, and most effective practices of inventory forecasting are disaggregated to enable retailers to gain insight into how contemporary forecasting systems operate.<\/span><\/p>\n

What is Inventory Forecasting?<\/strong><\/h2>\n

Inventory forecasting is the process of using past sales data, market and seasonality trends, and statistical or machine-learning models to predict future product demand. It also helps select the most appropriate inventory levels to meet demand without overstocking or understocking.<\/span><\/p>\n

Inventory forecasting is also known as demand forecasting, stock forecasting, or inventory prediction. Whatever the name, the purpose is the same: be aware of what you will need, when you will need it, and how much before your present stock is exhausted.<\/span><\/p>\n

Reacting after inventory issues occur leads to lost sales, excess stock, and supply chain disruption. At this stage, it is too late: customers have been lost to competitors, capital is locked up in unsold stock, and your supply chain is in disarray, trying to keep up.<\/span><\/p>\n

Inventory Forecasting vs. Demand Forecasting.<\/strong><\/h3>\n

These are words that are frequently used interchangeably, but there is a subtlety to know. Demand forecasting in retail concerns predicting customer demand.\u00a0<\/span><\/p>\n

Demand prediction is combined with operational context: supplier lead times, current stock levels, safety stock buffers, and warehouse capacity to come up with inventory forecasting. The demand forecasting output gives input to inventory forecasting to yield a practical procurement strategy.<\/span><\/p>\n

Why Inventory Forecasting Matters for Retailers<\/strong><\/h2>\n

All inventory choices, such as the quantity to order, timing to order, and location of stock holding, have a direct financial impact. The following is at stake:<\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n
Consequence<\/b><\/th>\nWithout Forecasting<\/b><\/th>\nWith Forecasting Software<\/b><\/th>\n<\/tr>\n<\/tbody>\n
Stockouts<\/span><\/td>\nWasted sales, customer turnover, and demotion.<\/span><\/td>\nPrevented with automated reorder triggers.<\/span><\/td>\n<\/tr>\n
Overstock<\/span><\/td>\nCash locked up, storage expenses, and forced markdowns.<\/span><\/td>\nDecreased by 20\u201330% when demand models are accurate.<\/span><\/td>\n<\/tr>\n
Supplier Relationships<\/span><\/td>\nUnpredictable order volumes, insufficient lead-time planning.<\/span><\/td>\nRegular and reliable ordering that fosters trust.<\/span><\/td>\n<\/tr>\n
Seasonal Demand<\/span><\/td>\nPoor readiness for demand spikes and drops.<\/span><\/td>\nPre-modeled and seasonally adjusted planning.<\/span><\/td>\n<\/tr>\n
Cash Flow<\/span><\/td>\nStagnant or inefficient inventory.<\/span><\/td>\nReduced working capital, optimized inventory turns.<\/span><\/td>\n<\/tr>\n
Marketplace Performance<\/span><\/td>\nLow inventory harms search ranking.<\/span><\/td>\nImproved availability and higher Buy Box win rate.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

How does Inventory Forecasting work (Process Flow)?<\/strong><\/h2>\n

\"Inentory<\/p>\n

Contemporary <\/span>inventory planning software<\/span> is based on a six-step process. Knowing this flow will allow you to evaluate the coverage of your existing tools in each step and the gaps in your forecasting architecture.<\/span><\/p>\n

Stage 1: Data Collection<\/strong><\/h3>\n

Data completeness and quality are the cornerstone of any prediction. Most stock forecasting systems take in data from point-of-sale (POS) systems, e-commerce systems, ERP systems, supplier lead-time data, past promotions, weather data, economic factors, and marketplace performance feeds. The more accurate your forecasts are, the richer and cleaner your data inputs will be.<\/span><\/p>\n

Stage 2: Demand Modeling<\/strong><\/h3>\n

Once collected, the data is processed using a forecasting algorithm. Depending on the software and your configuration, this may be a statistical, machine learning, or hybrid model. The latest <\/span>inventory optimization<\/span> systems also allow you to set the type of algorithm used for each SKU category, based on sales velocity and data volume.<\/span><\/p>\n

Stage 3: Inventory Planning<\/strong><\/h3>\n

Forecast outputs are translated into actionable metrics such as reorder points, safety stock levels, and economic order quantities for each SKU and location.<\/span><\/p>\n

Stage 4: Replenishment Execution<\/strong><\/h3>\n

Based on planning rules, replenishment triggers are activated to ensure stock levels are maintained according to the demand forecast.<\/span><\/p>\n

Stage 5: Procurement<\/strong><\/h3>\n

Purchase orders are generated either manually or automatically, aligning supplier timelines with forecasted inventory needs.<\/span><\/p>\n

Stage 6: Monitoring & Optimization<\/strong><\/h3>\n

The system compares forecasted demand with actual sales, measures accuracy, and continuously refines models to improve future forecasting performance.<\/span><\/p>\n

The 6 Core Inventory Forecasting Methods<\/strong><\/h2>\n

\"Inentory<\/p>\n

Various products, sales rates, and data access require various forecasting methods. The 6 most common retail <\/span>inventory planning software<\/span> methods today are:<\/span><\/p>\n

Method 01: Simple Moving Average (SMA)<\/strong><\/h3>\n

Divides total sales over the past by a specified period (e.g., the past 12 weeks) and uses that as the forecast for the next period. Uncomplicated, clear, and easy to apply, it equalizes all time periods regardless of their typical patterns.<\/span><\/p>\n

Best For: <\/b>Stable, low-volatility products that exhibit similar demand trends.<\/span><\/p>\n

Merit: <\/b>Simple, straightforward, minimal computational cost, transparent.<\/span><\/p>\n

Limit: <\/b>Weighs recent and old data the same, and is slow to adjust to changes in trends.<\/span><\/p>\n

Method 02: Weighted Moving Average (WMA)<\/strong><\/h3>\n

Like SMA but uses greater weighting on more recent periods. The greater predictive weight is accorded to sales made by a product last week than to sales made three months ago. This allows forecasts to be more responsive to recent trends with less complexity compared to more advanced methods.<\/span><\/p>\n

Best For: <\/b>Moderately trended products that are not very seasonal or volatile.<\/span><\/p>\n

Merit:<\/b> More responsive to recent demand shifts than SMA<\/span><\/p>\n

Limit:<\/b> The weight assignment is subjective and may overreact to short-term noise.<\/span><\/p>\n

Method 03: Exponential Smoothing (ETS)<\/strong><\/h3>\n

A statistically optimal methodology that assigns exponentially decreasing weights to older data. Triple exponential smoothing (Holt-Winters) generalizes this to use both trend and seasonality. It is among the best methods of retail demand forecasting.<\/span><\/p>\n

Best For:<\/b> The product is seasonal, fashion, and consumer goods that have distinct trend patterns.<\/span><\/p>\n

Merit:<\/b> Supports trend and seasonality, and is common in <\/span>inventory planning software<\/span>.<\/span><\/p>\n

Limit: <\/b>Must be tuned carefully (alpha, beta, gamma values).<\/span><\/p>\n

Method 04: AutoRegressive Integrated Moving Average (ARIMA)<\/strong><\/h3>\n

An advanced time-series model that accounts for autocorrelation in demand data, i.e., it takes into account the effect of today’s sales on past sales trends. ARIMA is a powerful tool, but it requires sufficient historical data and statistical knowledge to set up properly.<\/span><\/p>\n

Best For:<\/b> SKUs that have high value and long-term sales history and have a complicated demand structure.<\/span><\/p>\n

Merit:<\/b> Strong precision when the demand pattern of products is non-linear.<\/span><\/p>\n

Limit:<\/b> Computationally intensive; needs lots of historical data and knowledge.<\/span><\/p>\n

Method 05: Machine Learning Forecasting<\/strong><\/h3>\n

Hundreds of demand drivers can be used simultaneously in gradient boosting models, neural networks, and deep learning architectures, including price changes, competitor activity, weather, economic factors, marketing expenditure, and more. This is how enterprise-grade <\/span>inventory forecasting software<\/span> and major marketplace operators operate.<\/span><\/p>\n

Best For:<\/b> Retailers with a large number of SKUs, marketplace operators, and enterprise e-commerce.<\/span><\/p>\n

Merit: <\/b>Can be the most accurate; can treat multi-variable drivers of demand.<\/span><\/p>\n

Limit: <\/b>Needs big datasets, ML expertise, and substantial calculation power.<\/span><\/p>\n

Method 06: Collaborative \/ Qualitative Forecasting<\/strong><\/h3>\n

Integrates quantitative model results with human insights- sales team input, supplier intelligence, planned promotions, and market knowledge. Frequently done as a demand review procedure in which the forecasters have the ability to modify model outputs prior to entering into procurement.<\/span><\/p>\n

Best For:<\/b> New product launches, promotional planning, and strategic categories.<\/span><\/p>\n

Merit:<\/b> Takes into consideration market know-how and business environment that models fail to encompass.<\/span><\/p>\n

Limit:<\/b> Adds human factor; consumes time when dealing with a large SKU.<\/span><\/p>\n

Key Components of Inventory Forecasting Software<\/strong><\/h2>\n

\"Key<\/p>\n

Not every <\/span>inventory forecasting software<\/span> is constructed in an identical manner. A full <\/span>inventory optimization solution<\/span> must have all of the following elements operating within a seamless layer:<\/span><\/p>\n

1. Demand Forecasting Engine<\/strong><\/h3>\n

This is the primary algorithm layer that produces SKU-level demand predictions. Find platforms that can model different types of models and automatically choose the most suitable model per SKU.<\/span><\/p>\n

2. Calculation of reorder point<\/strong><\/h3>\n

Calculation of the reorder point of the SKU is automated and is based on demand forecast, safety stock, and supplier lead time. This is the main contributor to preventing stockouts.<\/span><\/p>\n

3. Safety Stock Management<\/strong><\/h3>\n

Adaptive safety stock buffers that take into consideration demand variability and supply lead time uncertainty. A frequent reason for stockout and overstock is the existence of a static safety stock.<\/span><\/p>\n

4. Inventory Optimization<\/strong><\/h3>\n

Economic order quantity (EDOQ) computations, ABC-XYZ segmentation, and multi-echelon optimization for multi-warehouse and multi-channel retailers<\/a>.<\/span><\/p>\n

5. Supplier Lead Time Management<\/strong><\/h3>\n

Monitoring and introducing variable supplier lead times into replenishment computations. Advanced platforms continuously update forecasts based on changing lead times.<\/span><\/p>\n

6. Promotion and Event Management<\/strong><\/h3>\n

The capability to modify forecasts of scheduled promotions, events of the seasons, and external drivers of demand. Unmodeled promotions can lead to a drastic under-preparation of stock planning.<\/span><\/p>\n

7. Forecast Accuracy Reporting<\/strong><\/h3>\n

MAPE (Mean Absolute Percentage Error), bias tracking, and accuracy by SKU, category, and channel. There is no loop of improvement without the accuracy measurement.<\/span><\/p>\n

8. ERP and E-Commerce Integration<\/strong><\/h3>\n

Native integrations with your current technology stack, ERP, WMS, POS, Shopify, Amazon Seller Central, and marketplace solutions<\/a>, to make forecasts based on up-to-date, comprehensive data.<\/span><\/p>\n

Best Inventory Forecasting Software & Tools<\/strong><\/h2>\n

Below is a list of the most popular <\/span>inventory forecasting software <\/span>and<\/span> stock forecasting tools<\/span>, in no particular order, which will assist you in finding the appropriate platform for your business scale and complexity:<\/span><\/p>\n

1. NetSuite Inventory Management | Enterprise ERP + Forecasting<\/strong><\/h3>\n

Full <\/span>inventory planning software<\/span> with demand forecasting, replenishment automation, and multi-location inventory optimization integrated into the larger NetSuite ERP. Powerful mid-market and enterprise retailers.<\/span><\/p>\n

Best fit: <\/b>Mid-market to large retailers with multi-location operations.<\/span><\/p>\n

2. ProactiveAI | AI-powered Business Intelligence\/Inventory.<\/strong><\/h3>\n

Predictive modeling of demand, real-time data insights, and automated replenishment recommendations that allow marketplace operators to optimize inventory accuracy by forecasting demand. It integrates BI dashboards with forecasting applications to support data-driven decision-making across sales channels.<\/span><\/p>\n

Best fit:<\/b> E-commerce and marketplace operators who need AI-based forecasting and inventory insights based on data.<\/span><\/p>\n

3. Brightpearl | Retail Operations Platform.<\/strong><\/h3>\n

Retail-oriented platform that integrates inventory, demand forecasting, order management<\/a>, and retail analytics into one platform. Targeted at large volume multichannel retailers.<\/span><\/p>\n

Best fit: <\/b>Omnichannel retailers that have a high volume of orders and complexity of multi-channel.<\/span><\/p>\n

4. Inventory Planner | Demand Forecasting Retail<\/strong><\/h3>\n

A specific demand forecasting and replenishment planning app that connects to Shopify, WooCommerce, Amazon, and others. Available to SMBs with practical AI-based suggestions.<\/span><\/p>\n

Best fit: <\/b>SMB e-commerce and Shopify merchants expanding their catalog.<\/span><\/p>\n

5. Blue Yonder | Enterprise AI Forecasting<\/strong><\/h3>\n

Full-scale <\/span>AI-based demand forecasting<\/span> and <\/span>inventory optimization<\/span> system deployed by large retailers and CPG worldwide. Integrates third-party demand indicators, weather forecasts, and sophisticated promotional simulation.<\/span><\/p>\n

Best fit: <\/b>Supplies are complex, and the retailer and the CPG manufacturer are large-scale.<\/span><\/p>\n

6. Final Stock | SMB Stock Forecasting Tool<\/strong><\/h3>\n

Easy-to-use inventory management with demand forecasting and automated reorder points. Powerful QuickBooks and e-commerce solutions. Easy point of entry to smaller retailers quitting spreadsheets.<\/span><\/p>\n

Best fit: <\/b>Small to mid-size retailers who have shifted off of spreadsheet-based forecasting.<\/span><\/p>\n

Inventory Forecasting for Multi-Channel & Marketplace Retailers<\/strong><\/h2>\n

Multi-channel ecommerce and marketplace activities pose certain challenges for inventory forecasting that single-channel retailers do not. It is important to know them when any business operates inventory on various selling platforms.<\/span><\/p>\n

Multi-Channel Inventory Visibility Problem<\/strong><\/h3>\n

As you sell on your own site, on Amazon, in a brick-and-mortar store, and on a marketplace at the same time, each channel has its own demand signal, yet they all tap into the same physical inventory.\u00a0<\/span><\/p>\n

In the absence of a single inventory layer, you can experience phantom inventory, overselling, and split shipments, all of which add to fulfillment costs.\u00a0<\/span><\/p>\n

The most effective inventory planning program to use in multi-channel retailers is one that consolidates all the channel demand signals into a single forecasting model.<\/span><\/p>\n

Marketplace-Specific Forecasting Considerations<\/strong><\/h3>\n

1. Vendor-Managed Inventory (VMI) on Marketplaces<\/strong><\/h4>\n

A more complex layer of added complexity to marketplace supplier forecasting markets is vendor-managed inventory (VMI), where marketplace operators must have vendor-level sales data and vendor lead-time management on the marketplace platform.<\/span><\/p>\n

2. Out of Stock Marketplace Search Ranking Effect<\/strong><\/h4>\n

When out of stock, the product will no longer have a search rank on Amazon, Flipkart, or other sites. Proper forecasting is a direct contributor to marketplace SEO performance and not operational efficiency.<\/span><\/p>\n

3. Seasonal Demand Synchronization<\/strong><\/h4>\n

During high seasons, such as Diwali or Black Friday, demand indicators across all channels spike at the same time. The cross-channel demand amplification due to these events should be incorporated in your forecasting model.<\/span><\/p>\n

4. Marketplace Compliance Lead Time Buffer<\/strong><\/h4>\n

Accurate inventory availability is needed to yield marketplace seller performance metrics. Forecasting should only use compliance buffers and not demand projections.<\/span><\/p>\n

Best Practices for Accurate Inventory Forecasting<\/strong><\/h2>\n

01. Clean Your Historical Data Before You Forecast<\/strong><\/h3>\n

The accuracy of forecasting algorithms is only as good as the data on which they have been trained. Audit your past sales data before committing to any <\/span>inventory forecasting software<\/span>: stockout periods, spikes during promotional periods that cannot be replicated, and data entry errors.\u00a0<\/span><\/p>\n

When uncleaned data is fed into a forecasting model, it gives systematically incorrect results.<\/span><\/p>\n

02. Use ABC-XYZ Segmentation to Prioritize Forecasting Effort<\/strong><\/h3>\n

Not all SKUs require the same level of forecasting sophistication. ABC segmentation groups SKUs by revenue share (A = 20% of SKUs that account for 80% of revenue).\u00a0<\/span><\/p>\n

XYZ segmentation is ordered by the regularity of demand (X = regular, Z = extremely irregular). Complex ML models and full control over safety stocks are worth the high-revenue, steady-demand SKUs (AX).\u00a0<\/span><\/p>\n

SKUs with low revenue and low regularity (CZ) might require simpler techniques or a manual override.<\/span><\/p>\n

03. Always Model Seasonality Explicitly<\/strong><\/h3>\n

Retail demand is seasonal in nature, and the seasonality pattern depends on the category, region, and customer segment. Do not use generic seasonal indices.\u00a0<\/span><\/p>\n

Construct seasonality profiles for each product category based on your historical data, and refresh them annually. By not modeling seasonality, systematic understocking before peak periods, and overstocking before slow periods occur.<\/span><\/p>\n

04. Account for Promotions Before They Run<\/strong><\/h3>\n

Advertisements cause spikes in demand, which your base model will not predict unless you inform it. Ahead of any significant promotion, a discount campaign, marketplace deal day, or influencer collaboration, make an upward adjustment to your forecast based on the approximated uplift.\u00a0<\/span><\/p>\n

The majority of inventory planning packages allow promotional override entries or promotional templates using past promo performance.<\/span><\/p>\n

05. Monitor Forecast Accuracy Continuously and Act on It<\/strong><\/h3>\n

Establish a monthly review frequency to assess forecast accuracy at the SKU and category levels using MAPE and bias measures. SKUs with low forecast accuracy and stability should be reconfigured in the model or investigated for data quality issues.\u00a0<\/span><\/p>\n

The greatest opportunity missed in a majority of forecasting implementations is the acceptance of poor accuracy as the norm. Compounding over time, a <\/span>6% improvement in MAPE<\/span><\/a> for your top 100 SKUs can result in a significant reduction in stockouts and overstock costs.<\/span><\/p>\n

06. Integrate Your Forecasting Tool with Your Full Data Stack<\/strong><\/h3>\n

Any <\/span>inventory forecasting software<\/span> that is independent of your ERP, WMS, e-commerce platform, and marketplace feeds will never have access to up-to-date, complete data.\u00a0<\/span><\/p>\n

Make platforms with native integrations to your existing systems a priority, or invest in an integration layer that ensures real-time data synchronization.\u00a0<\/span><\/p>\n

For marketplace operators, this means your marketplace platform needs to make clean, real-time inventory and order data available to your forecasting layer.<\/span><\/p>\n

How to Choose the Right Inventory Planning Software?<\/strong><\/h2>\n

The right <\/span>inventory planning software<\/span> is a strategic choice whose implementation and switching costs are long and expensive. Apply this appraisal system to choose the correct option:<\/span><\/p>\n

Evaluate Your SKU Count and Data Volume<\/strong><\/h3>\n

Simple moving average tools can work with catalogs of fewer than 500 SKUs. ML-driven platforms are useful and needed, with 1,000+ active SKUs, at which point manual review is no longer possible.<\/span><\/p>\n

Map Your Channel Complexity<\/strong><\/h3>\n

Standalone forecasting tools can be employed by single-channel retailers. Multi-channel and marketplace operators require platforms that include native multi-channel inventory aggregation, or a marketplace platform that collects this data upstream.<\/span><\/p>\n

Assess the Level of Integration<\/strong><\/h3>\n

Enumerate all your existing systems in the tech stack, ERP, WMS, POS, e-commerce sites, and marketplace feeds. Make vendors prove live integrations with your particular systems, rather than mere API availability.<\/span><\/p>\n

Demand Seasonal and Promotional Modeling Capabilities<\/strong><\/h3>\n

These are non-negotiable capabilities in case your business has significant seasonality or there are regular promotions. During the evaluation, test them with your own historical data, not only with vendor demo datasets.<\/span><\/p>\n

Assess Forecast Accuracy Benchmarks<\/strong><\/h3>\n

Request MAPE benchmarks of similar customers (similar industry, number of SKUs, and channel mix). Run a pilot using your own data before making a decision. The only forecast accuracy that matters is accuracy on your products.<\/span><\/p>\n

Assess Total Cost of Ownership<\/strong><\/h3>\n

Platform subscription cost is just one component. Include the costs of implementation, data migration, training, integration development, and maintenance. There are enterprise platforms that are cheap in terms of software but extremely expensive in terms of implementation requirements and professional services.<\/span><\/p>\n

Check Vendor Support and Roadmap Alignment<\/strong><\/h3>\n

It is not a set-and-forget implementation with inventory forecasting. A responsive vendor who will actively develop the product and a roadmap that will keep up with the direction the business will take, which you might want to expand channels, geographies, or even product lines.<\/span><\/p>\n

Why SPXCommerce for Marketplace Inventory Management?<\/strong><\/h2>\n

We at SPXCommerce build marketplace inventory management capabilities to provide retailers with a single source of truth for demand, supply, and fulfillment across all their sales channels.<\/span><\/p>\n

We centralize real-time inventory, orders, and vendor information to ensure forecasting models run on clean, unified inputs rather than channel reports. This enables better demand forecasting, quicker replenishment, and less inventory skew across marketplaces and stores.<\/span><\/p>\n

We also assist businesses in making forecasting consistent with operational realities, including supplier lead times, safety stock policies, and promotional spikes.<\/span><\/p>\n

We are making sure that data flows are continuous, with no human involvement, by linking directly to ERP, WMS, and ecommerce. We are determined to do away with the guesswork in inventory planning and replace it with sound, actionable intelligence.<\/span><\/p>\n

Operating marketplaces with SPXCommerce enhances the availability, decreases overstock, and scales across more channels with the confidence of a high level of customer experience and operational efficiency. That is our way of providing scalable retail intelligence now.<\/span><\/p>\n

Conclusion<\/strong><\/h2>\n

The modern retail industry is largely dependent on inventory forecasting. It assists companies in forecasting future demand based on past trends and sophisticated <\/span>inventory forecasting software<\/span>, aiding in planning inventory and decision-making.<\/span><\/p>\n

It minimizes stockouts and overstocks, increases cash flow and operational efficiency, as well as customer satisfaction in various sales channels.<\/span><\/p>\n

Nevertheless, prediction accuracy is determined by clean data, appropriate models, and ongoing performance checks. With built-in systems and real-time data, it can be an effective instrument in enhancing inventory management.<\/span><\/p>\n

Finally, effective inventory forecasting enables retailers to respond more quickly to demand fluctuations, streamline supply chains, and build a more efficient, scalable business.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Retailers operate in an environment where every stock decision impacts revenue, customer satisfaction, and efficiency.\u00a0 Excess inventory is costly in terms of working capital and storage expenses, and insufficient inventory is costly through stockouts, lost sales, and diminished customer confidence. 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