Leverage and scale

Economies of scale

Unit cost goes down as volume goes up. Sometimes.

The idea is simple: make 1,000 of something and your fixed costs spread thin, your supplier discounts get bigger, your machines run hotter. Each unit ends up cheaper than the last.

This is real and structural in some industries. Manufacturing, logistics, energy, anything capital-intensive. A car factory that produces 500,000 cars a year has lower per-car costs than one that produces 50,000. Amazon Web Services has lower cost per gigabyte than a small data centre. Walmart can buy at terms a corner store can't even ask for.

But (and this is the part most operators get wrong) scale doesn't always create lower unit costs. Sometimes it does the opposite.

Three places scale stops working:

When the product is custom. Bespoke kitchens, consulting projects, top-end legal work. Each unit is different, so the marginal cost doesn't go down. Doubling the company doubles the cost.

When coordination overhead eats the gains. A 50-person company has fewer meetings per person than a 5,000-person company. Past a certain size, the cost of just running the place starts to outweigh the savings.

When the supply chain is constrained. If timber is the scarce input, buying more of it doesn't make it cheaper. Sometimes the supplier raises prices because they know you need it.

For most businesses, scale economies are real but bounded. The cost curve looks like a U: it goes down for a while, flattens, then starts going up. The interesting strategic question isn't "are we getting bigger?" It's "are we still on the part of the curve that's going down?"

Worth knowing: scale economies are usually a moat (see [moats]) but only when they're hard to replicate. Costco's scale is a moat because no new entrant can match it without burning $50B+ first. A regional bakery's scale isn't really a moat because a competitor can match it relatively easily.

Examples in the wild