What is the difference between just in time and safety stock?

Safety stock is inventory held in reserve to cover delivery delays or demand spikes — it exists to absorb the variability that JIT removes. JIT replaces safety stock with a transport arrangement precise enough to deliver exactly when production needs the goods. The two approaches manage the same risk in opposite ways: safety stock holds inventory as a buffer; JIT removes the need for that buffer by making the transport reliable enough to replace it.

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What Does Just in Time Mean in Logistics?