# Safety Stock ## Definition Inventory held in excess of expected demand to buffer against supply and demand uncertainty. Safety stock represents capital deliberately kept unproductive — not expected to be consumed in normal operations — in order to preserve operational continuity when actual demand or supply deviates from forecast. The optimal safety stock level balances inventory holding cost against stockout cost. ## Source Capital and Inventory in Supply Chain Management, §Safety Stock and Reserve Capacity ## Supply Chain Domain Capital Management ## VSM Assignment S3 — Safety stock is a management-level capital allocation decision. The question of how much safety stock to hold is a resource management choice that trades off capital efficiency against operational resilience, made at the S3 (management/control) level. ## WoN Concept Accumulation of Stock — Smith describes the accumulation of stock as a prerequisite for productive activity: you cannot employ workers until you have stock to sustain them. Safety stock is a modern instantiation of this logic — productive continuity requires a buffer of stock to absorb variability, just as Smith's pre-capitalist household needed a reserve before it could specialise its labour. Both represent capital held in reserve against contingency rather than deployed in production.