Vendor managed inventory (VMI)
Vendor managed inventory shifts responsibility for maintaining inventory levels from buyer to supplier. The supplier monitors the buyer's inventory and replenishes stock as needed to maintain agreed service levels. VMI can reduce administrative burden, improve inventory turns, and leverage supplier expertise in managing their products.
Examples
Production materials VMI: A component supplier monitors a manufacturer's floor stock via electronic data sharing. When inventory drops below agreed levels, the supplier ships replenishment without waiting for purchase orders. The manufacturer is invoiced only when materials are consumed.
Industrial distribution VMI: A distributor manages a customer's MRO storeroom, conducting regular visits to check stock levels and replenish as needed. The customer avoids managing reorder points for hundreds of items.
Consignment VMI: A supplier places inventory at the customer's site, retaining ownership until consumption. The supplier manages stock levels, and the customer pays only when materials are used in production.
Definition
VMI works best when suppliers have better visibility into their product's availability and lead times, when the buyer consumes products predictably, and when administrative efficiency gains justify the relationship complexity.
Successful VMI requires clear agreements about service levels (minimum stock levels, maximum stock levels, response times), inventory ownership, payment terms, and performance measurement. Information sharing mechanisms must provide suppliers with consumption and inventory data.
VMI benefits suppliers through better demand visibility, reduced order variability, and stronger customer relationships. Benefits to buyers include reduced procurement workload, improved inventory turns, and outsourcing of replenishment decisions to product experts.
VMI risks include dependency on supplier performance, potential for excess inventory if not well managed, and loss of control over procurement decisions. Strong agreements and performance monitoring mitigate these risks.
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