Tied-up cash is the value of inventory held, seen for what it really is: cash converted into goods. This page closes the domain by linking each component of stock to the lever that drives it, because a reduction plan is only worth something if it names, for every unit targeted, the precise cause holding it and the decision that releases it.
Why it matters
The request almost always arrives in the same form: cut inventory by fifteen percent. Put that way it is unworkable, because it names neither which stock nor by what means. Teams then have only two ways to comply, delay orders or degrade service, and both are paid for in the months that follow.
Breaking it down changes the nature of the exercise entirely. Stock is not a homogeneous mass but the sum of four components with distinct causes. Cycle stock comes from lot sizes. Safety stock comes from service levels and variability. In-transit stock comes from lead times. Dormant stock comes from past decisions never settled.
Each answers a different lever, and only one. Reducing cycle stock runs through lots and ordering cost. Reducing the buffer runs through service differentiation and pooling. Reducing transit runs through shorter lead times. Clearing dormant stock runs through an exit decision. None of these levers substitutes for another, and none degrades service.
That is what the waterfall in the signature shows. You start from current stock, apply each lever to the component it drives, and obtain a quantified target. The result is no longer a negotiated percentage but a sum of identified decisions, each of which can be assigned to someone.
One lesson almost always emerges from this breakdown: the largest pool is also the easiest. Dormant stock protects nothing, serves no flow, and clearing it costs not one point of service. Yet in most portfolios it represents a share of capital comparable to safety stock, which reduction plans attack first at the price of real degradation.
The second lesson concerns durability. The three levers are not equal over time. Clearing dormant stock is a one-off gain that does not repeat if the upstream causes are left uncorrected. Resetting lots and differentiating buffers are permanent gains, because they change the operating regime. A credible plan states the two separately.
The expert lesson is to refuse the global target and replace it with a named waterfall. Every unit targeted must be tied to a component, a lever, an owner and a deadline. This discipline turns a financial instruction into an operational programme, and it has a further virtue: it makes visible what cannot be released without breaking something.
The mechanism
The breakdown is built reference by reference from notions already met. Cycle stock is half the quantity ordered, safety stock is the configured buffer, transit follows from lead time and flow, and dormant stock is spotted through age and forward cover. The sum should approach observed stock, and the residual gap is itself instructive.
Lever yields are then quantified from the pages of this domain. Dividing the ordering cost lowers the economic lot by its square root, hence cycle stock. Pooling sites reduces the buffer by the square root of the number of sites. Differentiating service lowers the safety factor where a stockout costs little. These orders of magnitude allow an estimate before any implementation.
One component deserves particular mention because it is often forgotten: stock in transit. It does not always appear in stock reports, it sometimes belongs to the supplier in accounting terms, and yet it is financed. On long chains it represents a considerable share of capital, and the only lever that reaches it is lead-time reduction.
Finally, what is releasable must be separated from what is not. Part of the stock protects a commercial promise the company has chosen to keep, and removing it would mean changing that promise. The role of the breakdown is also to make that choice explicit, rather than suggesting an infinite pool exists.
The traps
A target expressed as a percentage of total stock names neither component nor lever. Teams then have only two quick ways to hit it, delaying receipts or degrading service, and both rebound on the company the following quarter.
Safety stock is the most visible and the easiest to cut in a configuration, but it is the only component that protects service. Dormant stock, often of comparable size, protects nothing and releases with no operational consequence.
Clearing dormant stock produces a gain that does not repeat, while resetting lots and differentiating buffers change the regime durably. Announcing both together gives a flattering first-year trajectory and an untenable second one.
The rollout
Split stock between cycle, safety, transit and dormant, reference by reference. No quantified commitment should be made before this step.
Explicitly link lot size to cycle, service and pooling to the buffer, lead time to transit, and the exit decision to dormant stock. One lever per component, no more.
Handle dormant stock first, since it protects no service, before touching the buffers that carry the customer promise.
Present the non-repeatable clearance gain separately from the structural gain of parameter resetting. The plan’s credibility depends on it from year two.
Assign every targeted amount to a person and a deadline. A waterfall without owners reverts to a global percentage within two steering meetings.
Neighboring concepts
From knowledge to action
A credible plan ties every unit targeted to a component, a lever and an owner. Our Inventory & distribution file builds that waterfall and separates one-off from permanent gains.