safety stock
US /ˈseɪf.ti ˌstɑːk/
UK /ˈseɪf.ti ˌstɑːk/

1.
an additional quantity of an item held in inventory to reduce the risk of a stockout caused by uncertainties in supply and demand
:
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We maintain a safety stock of critical components to prevent production delays.
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Calculating the optimal safety stock level is crucial for inventory management.