Economies of Scale

Economies of scale mean unit cost falls as output rises. Building a factory costs the same whether it makes one unit or a million, so that cost spreads thinner as volume grows.

Splitting fixed from variable costs makes it clear. Rent, equipment and research are fixed regardless of output, and how many products those fixed costs are divided across determines unit cost.

Industries where the effect is strong tend toward winner-takes-most. That is why only a few firms survive in semiconductors, cars and aircraft, where initial investment is enormous — latecomers lose on cost before they start.

Software is the extreme case. Once written, copying costs almost nothing, so cost barely rises as users multiply. That is why successful software companies show unusually high margins.

It does not improve without limit, though. As organisations grow, decisions slow and administrative costs mount until efficiency falls — diseconomies of scale.