Economies of Scale

Business Calculus · Axiom Academy

Why bigger can mean cheaper—but not always Average cost decreases as production increases. Fixed costs spread over more units. Average cost stays flat . Operating at efficient scale—the sweet spot! Average cost increases with production. Coordination and complexity costs rise. Scenario 1: Craft Brewery Expansion Scenario 2: Software Company Growth Industries and Their Scale Characteristics High economies of scale: Large fixed costs (planes, gates) spread over many passengers. Why a few big carriers dominate. Mixed: Economies in equipment sharing, diseconomies from coordination. Optimal size exists. Limited economies: Each location needs similar resources. Why franchises rather than mega-restaurants. Extreme economies: High development cost, near-zero marginal cost. One hit can fund many failures. Natural monopoly: Massive infrastructure costs create economies so large that one provider is most efficient. Few economies: Labor-intensive with limited automation. Why hairdressers stay small. Sources of Economies and Diseconomies Sources of Economies (why AC falls): Sources of Diseconomies (why AC rises): Economies of scale: MC < AC (marginal pulls average down) Diseconomies of scale: MC > AC (marginal pulls average up) Efficient scale: MC = AC (at minimum average cost) To find efficient scale: Set AC'(x) = 0 and solve for x Cost functions with only x^2 terms in variable cost show diseconomies Growth isn't always good: Expanding past efficient scale increases costs

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