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🔑 '''Trigger''' in insurance refers to the event, condition, or point in time that activates coverage under a policy, determining whether and when an insurer becomes obligated to respond to a [[Definition:Claims | claim]]. The concept is foundational because the same underlying loss can produce radically different coverage outcomes depending on which trigger applies — a distinction that has generated decades of litigation, particularly in long-tail [[Definition:Liability insurance | liability]] lines such as [[Definition:Asbestos liability | asbestos]], environmental contamination, and [[Definition:Product liability insurance | product liability]].

⚙️ Several trigger theories operate across global insurance markets. An ''occurrence'' trigger ties coverage to the policy in effect when the injury or damage actually takes place. A ''manifestation'' trigger looks to when the injury or damage becomes known or apparent. A ''claims-made'' trigger — widely used in [[Definition:Professional liability insurance | professional liability]], [[Definition:Directors and officers liability insurance (D&O) | D&O]], and [[Definition:Cyber insurance | cyber]] policies — responds only to claims first made against the insured during the policy period, regardless of when the underlying act occurred, and typically requires a [[Definition:Retroactive date | retroactive date]] to limit exposure to pre-inception events. A fourth approach, the ''continuous trigger'' or ''triple trigger,'' holds that every policy in effect from initial exposure through manifestation may be called upon to contribute, spreading liability across multiple policy years. Courts in the United States have applied different trigger doctrines by jurisdiction and by peril, while UK and European markets generally rely on contractual policy language — particularly the distinction between ''losses-occurring'' and ''claims-made'' wordings — rather than judicially imposed trigger theories. In [[Definition:Reinsurance | reinsurance]], the trigger question cascades further: the reinsurance contract may operate on a ''losses-occurring'' or ''risks-attaching'' basis, layering an additional timing mechanism on top of the original policy's trigger.

💡 Properly understanding which trigger governs a given policy is critical for [[Definition:Underwriting | underwriters]], [[Definition:Claims adjuster | claims professionals]], and [[Definition:Actuarial analysis | actuaries]] alike. Misjudging the trigger can lead to coverage disputes, [[Definition:Reserves | reserve]] inadequacies, and unexpected aggregation of liabilities across multiple policy years. For [[Definition:Insurtech | insurtech]] companies designing [[Definition:Parametric insurance | parametric products]], the trigger takes on a more literal meaning — a specified index reading or data threshold that automatically releases payment — simplifying the traditional ambiguity but introducing basis risk. Whether defined by legal doctrine, contractual language, or algorithmic threshold, the trigger remains one of the most consequential structural elements in any insurance arrangement.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Claims-made policy]]
* [[Definition:Occurrence policy]]
* [[Definition:Retroactive date]]
* [[Definition:Parametric insurance]]
* [[Definition:Long-tail liability]]
* [[Definition:Policy period]]
{{Div col end}}

Definition:Trigger - Revision history

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