When small and frequent is right: order frequency versus opportunity cost.

If receiving were the only hidden cost, the answer would always be to order in big, infrequent batches. It is not, because holding stock has its own hidden costs, and they can be larger. The most important is opportunity cost: every euro tied up in inventory is a euro not available for growth, for paying down debt, or for anything else that earns a return. On top of that sit the cost of the space the stock occupies, the risk that it spoils or goes out of date, and the simple fact that demand might change before you have sold what you bought. For perishable goods, fast-moving fashion, or anything where capital is scarce, these costs dominate, and small and frequent wins.

This is the real lesson of the economic order quantity, once you put the right costs into it. It is not a rule that says order big; it is a balance between two opposing forces. Ordering cost, including all the receiving and quality work from the previous note, pushes toward larger, rarer orders. Holding cost, including opportunity cost, pushes toward smaller, more frequent ones. The economic order quantity is simply the point where their sum is lowest, and that point is different for every item, every supplier and every business. A slow-moving, cheap, stable component belongs in big batches. A fast-moving, expensive, perishable one belongs in small frequent ones. Treating them the same is the mistake.

The trouble is that most organizations cannot see both sides of the balance clearly. They feel the holding cost, because it sits in plain view as inventory on the balance sheet, and they underfeel the receiving cost, because it is buried in overhead. Or the reverse, in a business obsessed with transaction efficiency. A causal cost model fixes this by putting a real number on both: the true cost to receive and the true cost to hold, including the opportunity cost of the capital. Only then is the trade-off honest, and only then can you set an order pattern per item rather than by habit or by a single companywide rule. The mechanism follows standard total cost of ownership and EOQ logic; any figures used in discussion are illustrative.

So the answer to 'should we order small and often' is the most useful answer in cost management: it depends, and here is exactly what it depends on. Weigh the cost to receive against the cost to hold, including what the tied-up capital could earn elsewhere, and let the balance, not the habit, decide.