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📊 '''Aggregate''' in insurance refers to the maximum total amount an [[Definition:Insurance carrier | insurer]] or [[Definition:Reinsurer | reinsurer]] will pay for all covered [[Definition:Claims | claims]] within a defined period — typically a [[Definition:Policy period | policy year]] — regardless of how many individual losses occur. While a [[Definition:Per-occurrence limit | per-occurrence limit]] caps the payout for any single event, the aggregate acts as a ceiling on the carrier's cumulative liability across all events combined. The concept appears throughout [[Definition:Commercial insurance | commercial insurance]], [[Definition:Liability insurance | liability coverages]], and [[Definition:Reinsurance | reinsurance]] structures, and it is a fundamental parameter in both [[Definition:Policy | policy]] design and [[Definition:Underwriting | underwriting]] analysis.

⚙️ When a [[Definition:Policyholder | policyholder]] purchases a [[Definition:General liability insurance | general liability]] policy with a $1 million per-occurrence limit and a $2 million general aggregate, the carrier will pay up to $1 million on any single [[Definition:Covered loss | covered claim]] but no more than $2 million total across all claims during the policy period. Once the aggregate is exhausted, the insured bears responsibility for any further losses — unless an [[Definition:Excess insurance | excess layer]] or [[Definition:Umbrella insurance | umbrella policy]] sits above. In [[Definition:Reinsurance | reinsurance]], aggregate limits define the total recoverable amount under treaties such as [[Definition:Aggregate excess-of-loss reinsurance | aggregate excess-of-loss]] or [[Definition:Aggregate stop-loss | stop-loss]] arrangements, giving the [[Definition:Cedent | cedent]] protection against an accumulation of moderate losses that individually fall below catastrophe thresholds but collectively threaten profitability.

🔑 Understanding how aggregates function is essential for [[Definition:Risk management | risk managers]], [[Definition:Insurance broker | brokers]], and underwriters alike. For the insured, monitoring aggregate erosion over the policy term is a critical discipline — a business that burns through its aggregate early in the year faces an exposed gap until renewal. For the carrier, aggregate limits are a key lever in controlling [[Definition:Portfolio | portfolio]] volatility: setting them too generously invites adverse [[Definition:Loss development | loss development]], while setting them too tightly can make the product uncompetitive. [[Definition:Actuarial science | Actuaries]] model aggregate exposures by simulating thousands of possible loss scenarios, and the resulting distributions directly inform [[Definition:Pricing model | pricing]], [[Definition:Reserve | reserving]], and [[Definition:Capital allocation | capital allocation]] decisions.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Aggregate excess-of-loss reinsurance]]
* [[Definition:Aggregate stop-loss]]
* [[Definition:Per-occurrence limit]]
* [[Definition:Policy limit]]
* [[Definition:General liability insurance]]
* [[Definition:Umbrella insurance]]
{{Div col end}}

Definition:Aggregate - Revision history

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