Executive summary

Inventory is at once a cost, an operational necessity and an option. Too little and you miss sales or halt a process; too much and you tie up cash and carry price risk. The commercial skill is positioning the right grade, in the right place, at the right time — and recognising when inventory is optionality rather than just stock.

In plain English

Firms hold inventory for two reasons: to keep operations running (a refinery needs feedstock; a distributor needs stock to serve orders) and to be able to capture an opportunity (sell into a price spike, serve a surprise order). Both uses cost working capital — cash plus a credit line — and expose the holder to price moves unless hedged.

Why traders care

• Inventory is where the convenience yield is realised — holding the physical lets you respond to scarcity.
• Positioning stock near demand centres or logistical chokepoints captures location basis and lets you react to disruptions faster than rivals.
• Inventory ties up working capital, so its level is a direct lever on capital efficiency and on how much business you can finance.

Operator connection

Stock positioning, safety stock, tank heels and replenishment timing are operational decisions that execute the inventory strategy. The operator decides what sits where, and therefore how much optionality and how much cost the firm is carrying.

Further reading

• Kaldor / Working — theory of storage and convenience yield (why inventory has option value).
• CME Group — cost-of-carry and storage education materials.
• Supply-chain / working-capital texts on inventory holding cost and service-level trade-offs.