Availability

Availability is whether a product can be purchased at a specific retailer at a specific moment. Collected from outside a retailer's systems, availability is inferred from what the page displays rather than read from an inventory feed. Retailers signal it inconsistently, through labels such as in stock, temporarily unavailable, ships in two to three weeks, only a few left, or simply a disabled add-to-cart button, and each of those has to be mapped to a shared set of states before numbers from different retailers can sit in the same report. Availability is often local as well. In grocery, and at any retailer offering store fulfillment, the same SKU can read as available at one postcode and unavailable at another.

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Why it matters

• Feeds marketplace ranking directly, since stock availability is one of the inputs that decides which offer gets featured
• Turns a stockout from something spotted in a weekly sales report into something visible the day it happens
• Pushes demand toward competitors, which makes a competitor stockout a commercial opening on the same footing as your own being a loss

How it is used

• Out-of-stock rate reporting by SKU, retailer and region
• Stockout alerting on priority lines, with duration tracked through to resolution
• Competitor availability monitoring to detect supply pressure across a category

Availability, out of stock and stock level describe three different levels of the same signal. Availability is the state a retailer displays. Out of stock is one value that state can take. Stock level is a unit count, which most retailers never publish, so it is usually estimated rather than observed. Treating an estimated stock level as a reported one is a common source of misplaced confidence in availability reporting.