Shrinkage is the difference between recorded inventory and physical inventory. It is commonly assumed to mean theft, but in small ecommerce operations the largest contributor is usually administrative: stock received without being counted against a purchase order, unrecorded damage, and picking errors that were never reconciled.
In more detail
The word carries an accusation it usually has not earned. Investigating shrinkage as a security problem when it is a receiving problem wastes effort and damages trust at the same time.
The four causes are administrative error, damage that was never written off, picking and dispatch mistakes, and theft. Ordering an investigation by likelihood rather than by drama gets to the answer faster.
Cycle counting is what makes shrinkage traceable. Found within days, a discrepancy has an identifiable delivery, picker and paperwork attached. Found at an annual count, it is a number with no story.
The four causes, in rough order of likelihood
| Cause | Typical share in a small store | How you would know |
|---|---|---|
| Receiving error | Usually the largest | Discrepancies cluster near deliveries |
| Unrecorded damage | Common | Write-offs happen but are not booked |
| Picking and dispatch | Common | Customers report wrong or missing items |
| Theft | Usually the smallest | Concentrated by location or shift |
Where people get it wrong
- Assuming theft first. It is usually the smallest of the four causes in a small operation.
- Adjusting counts without recording the cause. This is how the same discrepancy returns indefinitely.
- Only counting annually, which guarantees that no discrepancy is traceable.
- Treating it as a single number. Shrinkage concentrated in one SKU or one location is a specific process fault wearing an aggregate's clothing.
Why the order matters
Ranking the causes changes where you look first, and looking in the wrong place is expensive twice over: it costs the investigation, and it costs trust if the investigation was framed around theft.
The ordering above is a general pattern in small ecommerce operations rather than a measured statistic, and your store may differ. The way to find out is to record the cause each time you correct a count, which after a few months gives you your own ordering rather than a borrowed one.
Common questions
What causes shrinkage in a small store?
Usually administrative error first: stock received without being checked against a purchase order. Then unrecorded damage, then picking and dispatch mistakes, then theft.
How do I find where shrinkage is coming from?
Cycle count often enough that a discrepancy is still traceable, and record the cause each time rather than only the correction. Patterns by SKU or location appear quickly.
Is shrinkage the same as negative inventory?
No. Negative inventory is a specific symptom, where records show less than zero. Shrinkage is the broader gap between recorded and actual, which can exist without any number going negative.