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🎯 '''Trigger mechanism''' is the contractually defined condition or set of criteria that must be satisfied before a [[Definition:Reinsurance | reinsurance]] contract, [[Definition:Insurance linked securities (ILS) | insurance linked security]], or [[Definition:Parametric insurance | parametric insurance]] policy activates and pays out. In the insurance and reinsurance markets, trigger design is one of the most consequential structural decisions in a transaction, because it determines not only when a payment is made but also the degree of [[Definition:Basis risk | basis risk]] borne by the protection buyer — the risk that the trigger fires (or fails to fire) in a way that does not align with the buyer's actual losses.

⚙️ Several distinct trigger types are used across the industry, each with different trade-offs. An [[Definition:Indemnity trigger | indemnity trigger]] pays based on the cedent's actual [[Definition:Claims | losses]], providing the closest match to real economic exposure but requiring detailed [[Definition:Loss adjustment | loss adjustment]] and verification, which can delay payment. A [[Definition:Parametric trigger | parametric trigger]] pays when a measurable physical variable — wind speed at a specific weather station, earthquake magnitude at a given depth, rainfall exceeding a defined threshold — breaches a pre-set level, enabling rapid payout without claims investigation. [[Definition:Industry loss warranty (ILW) | Industry loss triggers]] activate when aggregate market losses from an event, as reported by agencies such as [[Definition:Property Claim Services (PCS) | PCS]] in the United States or [[Definition:PERILS | PERILS]] in Europe, exceed a stated amount. Modeled loss triggers rely on the output of a specified [[Definition:Catastrophe model | catastrophe model]] run against actual event parameters. Each type appears across different product structures: [[Definition:Catastrophe bond | catastrophe bonds]] frequently use parametric or industry loss triggers, while traditional reinsurance treaties more commonly employ indemnity triggers. [[Definition:Parametric insurance | Parametric microinsurance]] products in emerging markets — covering smallholder farmers or disaster-vulnerable communities — almost universally rely on parametric triggers because they eliminate the administrative burden of individual claims assessment.

💡 Choosing the right trigger mechanism involves balancing speed, accuracy, transparency, and cost. Parametric triggers offer near-instant payouts and lower administrative friction, but they expose the buyer to basis risk: a hurricane may devastate an insurer's portfolio without the wind speed index reaching the contractual threshold, leaving the insurer uncompensated. Indemnity triggers eliminate basis risk in theory but introduce moral hazard concerns and longer settlement timelines. Regulators in various jurisdictions scrutinize trigger design carefully — [[Definition:Solvency II | Solvency II]] frameworks require that [[Definition:Risk transfer | risk transfer]] be demonstrable for capital relief, which means the trigger must be closely correlated with the cedent's actual exposure. As the [[Definition:Insurance linked securities (ILS) | ILS]] market matures and [[Definition:Parametric insurance | parametric insurance]] expands into new perils like [[Definition:Cyber insurance | cyber]] and pandemic risk, trigger innovation continues — including hybrid structures that blend parametric speed with indemnity accuracy, aiming to reduce basis risk while preserving the efficiency gains that make alternative risk transfer attractive.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Parametric insurance]]
* [[Definition:Basis risk]]
* [[Definition:Catastrophe bond]]
* [[Definition:Industry loss warranty (ILW)]]
* [[Definition:Insurance linked securities (ILS)]]
* [[Definition:Indemnity]]
{{Div col end}}

Definition:Trigger mechanism - Revision history

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