PPV Purchase Price Variance — the gap between what you expected to pay and what you actually paid per unit.
TCO Total Cost of Ownership — the full economic burden beyond the sticker price: freight, duties, storage, quality, disposal.
SUM Spend Under Management — the percentage of total outflow tracked through proper procurement channels. Best-in-class: 91.5%.
Maverick Spend Off-contract buying outside negotiated agreements. Leaks 5–16% of targeted savings (Hackett Group).
Tail Spend The bottom 20% of transactions by value — small, frequent, and often unmanaged. Easy to overlook, expensive in aggregate.
PO Purchase Order — the official document that authorizes a purchase. Internal processing alone runs $45–120 per PO.