Economies of scale

Economies of scale are the cost savings a company gets from being larger. Fixed costs such as a factory, a distribution network, research spending or an advertising budget get spread over more units, so the cost of producing each one falls as volume grows. A larger buyer can also negotiate better prices from its own suppliers.

This is one of the classic sources of a moat. A company with a scale advantage can sell at a price a smaller competitor can't match without losing money, or charge the same price and keep a wider margin. In industries with heavy fixed costs, such as retail distribution, semiconductors or cloud infrastructure, scale can be the main thing standing between the leader and new entrants.

Scale shows up in the numbers as margins that widen as revenue grows, because costs rise more slowly than sales. It has limits: the advantage shrinks once a competitor reaches similar size, and a company that grows too large or complex can face rising costs instead. When a company claims a scale advantage, check whether its margins are higher than smaller peers and whether they have kept improving as it grew.