Just in case (JIC)
Just in case (JIC) means deliberately holding buffer inventory and spare capacity as insurance against supply disruptions and demand spikes. It is the counterpoint to just-in-time, which strips buffers out in the name of efficiency. JIC accepts a known carrying cost in exchange for continuity when a supplier fails, a lead time stretches, or demand jumps past the forecast.
Examples
Pricing the insurance: A single-fab microcontroller costs $3.80 and feeds 5,000 units a week. A 12-week buffer is 60,000 pieces, $228,000 of inventory, roughly $46,000 a year to carry at a 20% rate. One avoided two-week stoppage on a $90,000-a-day line is worth $900,000. The buffer stays.
Segmented posture: The same plant runs M6 fasteners (three suppliers within 200 miles, 1-week lead time) with two days of stock and daily deliveries, while a custom ASIC on a 26-week single-source lead time carries 16 weeks. One policy would be wrong for both parts.
Definition
JIC is insurance, and the difference between a posture and a panic is whether the insurance gets priced. Per item, compare the cost to carry the buffer (capital, storage, obsolescence) against the expected cost of running out (line stoppages, expedites, lost orders). For a single-sourced part on a 26-week lead time feeding a line that costs $90,000 a day to stop, weeks of buffer are cheap insurance. For a commodity fastener with three local suppliers, the same buffer is waste.
The rational answer is usually a hybrid, not a religion. Run just-in-time on stable, multi-sourced, short-lead-time parts and hold deliberate safety stock on the fragile ones: single sources, long or volatile lead times, allocation-prone commodities. The 2021 to 2023 semiconductor shortage made this segmentation mainstream; Toyota, the company that built just-in-time, had stockpiled chips after the 2011 Tohoku earthquake and kept lines running longer than most rivals.
Treat JIC buffers as managed positions inside inventory management, with named owners and review dates, and as one tool in a broader supply chain resilience strategy alongside dual sourcing and design flexibility. A buffer nobody revisits quietly becomes obsolete stock.
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