📦 Stockouts

Stockouts#

Events where demand cannot be met because an item is unavailable.

Important

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What it is#

A stockout is when an item is unavailable — demand arrives but inventory is gone. It is the “too little” side of inventory planning, and each stockout is a missed sale at the moment of intent.

What it costs#

Stockouts cause lost revenue, frustrated customers, and substitution to competitors — and the damage can outlast the event if shoppers don’t return. They stem from under-forecasting, demand spikes, or supply disruptions, and most are preventable failures of replenishment rather than supplier problems.

The trade-off#

Stockouts are the mirror image of overstock — you can eliminate them by holding more inventory, but that raises holding costs. Firms manage the tension with safety stock sized to a target service level, and sharper forecasts shrink both failure modes at once.

Theme: Operations & Supply Chain · All terminology

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Mind map — connected ideas

Overstock % · WAPE (Weighted Absolute Percentage Error) · WMAPE (Weighted Mean Absolute Percentage Error) · Time Series Forecasting · MASE (Mean Absolute Scaled Error) · Seasonality

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More in Operations & Supply Chain

Backorder Rate · Crew Overtime · Demand Forecasting · Fill Rate · Long Lead Times · Long-Tail Items · Lost Sales Value · Overstock % · Real-Time Inventory Tracking · Reorder Point (ROP) Optimization · Safety Stock · SKU · Slow-Moving SKUs · Stockout Rate