Out-of-stock, usually shortened to OOS, is a product not being on the shelf when a shopper looks for it. It is measured from the shelf rather than from the warehouse, which is the distinction that matters. A product can be in the store, in the back room, and still out of stock as far as the shopper is concerned. The same measure stated positively is on-shelf availability.
Out-of-stock is reported as the share of stores or store-weeks in which an item was unavailable. Retail rates commonly sit in the mid single digits and rise during promotions and seasonal peaks, which is to say they rise exactly when the brand most wants the product there.
The causes divide roughly in two. Supply causes sit upstream, where the item did not arrive. Shelf causes sit in the store, where the item arrived but was not put out, or the shelf held too few units to last between deliveries. The second group is larger than brands tend to assume, and it connects directly to how many facings an item was allocated.
An out-of-stock costs the sale, and often more than the sale.
A shopper who cannot find a product substitutes. Some of those substitutions are temporary. Some are not, because the shopper discovers an alternative that works and has no particular reason to switch back. The cost of an out-of-stock is therefore the unit missed plus a share of the purchases that would have followed it.
Promotions make this sharper. A brand funds a discount to draw shoppers to the shelf, and an empty shelf converts that spending into a trial of whatever sits next to it.
A brand runs a promotion across a grocery chain. Demand runs ahead of the replenishment cycle and the item is unavailable in a meaningful share of stores for the final week. The promotion still reports positive volume. What it does not show is the shoppers who came for the promoted item, found the space empty, and bought a competitor instead.
Reading out-of-stock as purely a supply chain measure. A large share of out-of-stock events happen in stores holding stock, where the problem is replenishment labor or too few facings to bridge the gap between deliveries. Those are shelf problems, and they are addressed in the planogram rather than in the supply plan.
Where TrueLoyal fits: A brand selling through retail usually hears about an empty shelf late and secondhand. A direct relationship with opted-in members does not fix the shelf, but it does give the brand a way to reach those shoppers that does not depend on the shelf being right that week.
Retail averages commonly fall in the mid single digits as a share of store-weeks, rising during promotions and seasonal peaks. Rates vary substantially by retailer, category, and format.
They are the same measure stated in opposite directions. On-shelf availability is the share of occasions the product was there, and out-of-stock is the share it was not.
Most come from both supply failures upstream and shelf failures in store, with the in-store share larger than most brands expect. A shelf that holds too few units between deliveries produces out-of-stocks even when supply is working.
Brands find out through retailer availability reporting where the retailer shares it, through syndicated data, and through field audits. Visibility varies considerably by retailer, and many brands learn about it well after the fact.
A facing is one unit of a product visible at the front of the shelf. An item with four facings occupies four units of width at eye level in the planogram, and an item with one facing occupies one. Facings determine how much of the shelf a product owns and, with it, how easily a shopper finds it.
A planogram is the retailer's diagram of a shelf, specifying exactly which products sit where, on which shelf, in what order, and with how many facings each. Store staff set the shelf to match it. It is shortened to POG in most retail conversation.
A line review is the meeting where a retailer decides what it will stock in a category for the coming period. Every item in the category is assessed, some are kept, some are cut, and new items are considered against the ones already on the shelf. For a brand selling through retail it is the single highest-stakes event of the year.
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