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📈 '''Cost curve''' in the insurance context refers to a graphical or analytical representation of how an insurer's costs — whether [[Definition:Loss | claims costs]], [[Definition:Expense ratio | operating expenses]], or [[Definition:Acquisition cost | acquisition costs]] — change as a function of volume, portfolio mix, or other operational variables. While the concept originates in economics, insurers and [[Definition:Insurtech | insurtechs]] use cost curves to understand unit economics: how much it costs to underwrite an additional policy, process an additional [[Definition:Claim | claim]], or serve an additional customer segment. A steep cost curve may indicate inefficiency or adverse [[Definition:Risk selection | risk selection]], while a flattening curve often signals that scale benefits or technology investments are driving down marginal costs.

⚙️ Operationally, insurers construct cost curves by analyzing data across their [[Definition:Book of business | book of business]]. A [[Definition:Loss cost | loss cost]] curve, for example, plots expected claim severity or frequency against rating variables, helping [[Definition:Actuary | actuaries]] calibrate [[Definition:Premium | premium]] adequacy by segment. [[Definition:Managing general agent (MGA) | MGAs]] and carriers evaluating distribution efficiency might chart [[Definition:Acquisition cost | acquisition costs]] per policy against growth in written premium to identify the point at which [[Definition:Economies of scale | economies of scale]] kick in. In [[Definition:Claims management | claims management]], cost curves reveal how [[Definition:Loss adjustment expense (LAE) | loss adjustment expenses]] behave at different settlement timelines — early resolution often flattens the total cost curve, while litigation-heavy portfolios see costs escalating steeply over time.

💡 For strategic decision-making, the cost curve is an indispensable tool. Insurers entering new markets or launching new products use projected cost curves to determine breakeven volumes and set realistic growth targets. [[Definition:Insurtech | Insurtech]] companies frequently pitch their value proposition in cost-curve terms, arguing that automation, [[Definition:Artificial intelligence (AI) | AI]]-driven underwriting, or digital distribution can shift the industry's cost curve downward. Reinsurers also study cedents' cost curves when evaluating [[Definition:Treaty reinsurance | treaty]] terms, since a cedent with a favorable cost structure is likely to produce more stable, profitable portfolios. In an industry where margins are perpetually under pressure from [[Definition:Underwriting cycle | cyclical]] dynamics and rising claim inflation, understanding where you sit on the cost curve — and how to bend it — is a competitive imperative.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Expense ratio]]
* [[Definition:Loss cost]]
* [[Definition:Acquisition cost]]
* [[Definition:Economies of scale]]
* [[Definition:Combined ratio]]
* [[Definition:Unit economics]]
{{Div col end}}

Definition:Cost curve - Revision history

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