The disruptions of recent years produced a predictable two-stage response across manufacturing. First, a rush to hold more of everything. Then, once carrying costs became visible and demand normalised, a rush to unwind it. Many manufacturers ended up paying twice — for the excess stock, then for the write-downs — and arrived back roughly where they started.

The more durable lesson isn’t about how much buffer to hold. It’s about what kind.

Buffers Come in Three Forms

Inventory is the obvious one and the most expensive to hold continuously. It protects against supply interruption for as long as it lasts, then stops.

Capacity buffer — running below maximum, or holding equipment and labour flexibility — protects against demand surges and lets you recover after a disruption. It costs utilisation rather than capital, and unlike inventory it doesn’t obsolete.

Time buffer — quoted lead times longer than your actual capability — costs nothing to hold and is competitively expensive if customers care about speed.

Most manufacturers reached for inventory because it’s the fastest lever. It’s rarely the most efficient one, and the strongest response usually mixes all three. Capacity and time buffers in particular are underused, largely because neither appears on a balance sheet and so neither gets managed as an asset.

Buffers Should be Targeted, Not General

The blanket approach — more of everything — is what created the subsequent write-downs. Buffer placement should follow exposure: components with single sources, long lead times, geographic concentration, or qualification barriers to substitution.

For a component with three suppliers and a two-week lead time, buffer is close to wasted. For a sole-source item with a six-month qualification requirement, it’s cheap insurance. The difference between those two cases is enormous, and treating them alike is the error that repeats.

Position it Where it’s Flexible

Buffer held as raw material or common sub-assemblies serves many finished products. The same value held as finished goods serves one, and is stranded if demand appears elsewhere.

Holding buffer as far upstream as service requirements allow is one of the more useful adjustments available. It pools risk across your range instead of betting on a specific mix.

Buffer is Not the Only Answer

The organisations that came through recent disruptions best generally weren’t the ones holding the most stock. They were the ones who knew their exposure quickly and could act on it — which is a visibility and decision-speed capability, not an inventory one.

Qualified alternative sources, pre-agreed decision authority, and a supply chain map that resolves impact in hours rather than days all substitute for inventory at a fraction of the carrying cost.

Decide Deliberately and Write it Down

The most practical outcome of a buffer review is a documented policy: which components carry buffer, how much, why, and what would trigger a change. Without that, levels get raised during a scare and never come back down, and nobody can explain the current position because it was never a decision.

ticktick.ai sets buffer levels by exposure category rather than uniformly, and records the rationale so positions can be reviewed rather than inherited.