simultaneous effect: stockout when stock is overstated, overstock when it is understated
analyzed in the literature: errors ignored, errors estimated, errors reduced by RFID
The hidden stockout: available in the system, absent in reality
When system stock is higher than physical stock, the company accepts orders it cannot fulfill. In e-commerce, the problem is abrupt: the sales commitment relies almost entirely on system data. The customer orders, then discovers a delay, cancellation or substitution. This situation degrades the service rate and pushes the customer toward a competitor.
Involuntary overstock: ordering what you already have
The opposite error is just as costly. If the system shows less stock than reality, the buyer may trigger unnecessary replenishment. The result is immobilized capital, consumed space, additional storage costs and sometimes obsolescence. For seasonal or perishable products, this overstock can quickly turn into markdowns or direct loss.
Decisions made on false data
ScienceDirect literature on supply chains exposed to inaccuracies shows that the gap between physical flow and information flow disrupts ordering policies, coordination between actors and demand assessment. If the company does not distinguish physical stock from recorded stock, it optimizes purchasing, forecasts and safety levels on an inaccurate representation of reality.
Restoring trust in stock data
The response is to reduce the gap at the source and make errors observable. RFID, scanning, cycle counting and WMS/ERP synchronization share the same objective: surface reliable data quickly enough for commercial decisions to remain correct. Reliable stock data lets sales teams promise what exists, purchasing teams order what is truly missing, and management steer with less uncertainty.
Stock errors do not create just one category of loss: they can simultaneously produce stockouts, overstock and poor procurement decisions. The only way out of this paradox is field data updated in real time and checked at every important movement.
Original summary based on ScienceDirect excerpts about inventory inaccuracies and their impact on supply chain performance. The cited ScienceDirect source is protected by Elsevier copyright; no long passage is reproduced and the full text must be consulted through the original link.
Original sources
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Inventory inaccuracy and supply chain performance
ScienceDirect / International Journal of Production Economics, 2010
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