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⚡ '''Index-based trigger''' is the contractual mechanism within a [[Definition:Parametric insurance | parametric]] or [[Definition:Index insurance | index-based insurance]] product that determines when a payout is activated. Rather than requiring a [[Definition:Claims adjuster | claims adjuster]] to verify an individual policyholder's loss, the trigger fires when a specified index — wind speed, earthquake magnitude, rainfall deficit, or another measurable variable — reaches or exceeds a predefined threshold. This concept is central to how insurers, [[Definition:Reinsurer | reinsurers]], and [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] investors structure non-indemnity risk transfer.

🔬 Designing an effective index-based trigger demands rigorous correlation analysis between the chosen index and the actual economic losses it is meant to proxy. [[Definition:Actuary | Actuaries]] and [[Definition:Catastrophe modeler | modelers]] select data sources — government weather agencies, seismological networks, satellite imagery providers — that offer reliable, tamper-resistant readings. The trigger structure may be binary (pay-or-no-pay once a threshold is crossed) or graduated (payouts scale linearly or in steps as the index moves further beyond the attachment point). In [[Definition:Catastrophe bond (cat bond) | catastrophe bond]] markets, for example, a parametric trigger might specify that principal is at risk if a hurricane of Category 3 or above makes landfall within a defined geographic box.

🧩 The choice of trigger type has profound implications for both [[Definition:Basis risk | basis risk]] and pricing. A tightly defined trigger — say, peak wind speed at a single weather station — is easy to verify but may not capture widespread damage that occurs at a different location. Broader triggers, such as area-average rainfall or modeled-loss indexes, reduce basis risk but introduce complexity and sometimes reliance on third-party model outputs. For [[Definition:Insurer | insurers]] and [[Definition:Cedent | cedents]] evaluating parametric solutions, the trigger design is where the real negotiation happens: getting it right means the product pays when it should, builds [[Definition:Policyholder | policyholder]] trust, and remains attractive to [[Definition:Capital markets | capital-market]] investors seeking transparent, auditable exposures.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Parametric insurance]]
* [[Definition:Index insurance]]
* [[Definition:Basis risk]]
* [[Definition:Catastrophe bond (cat bond)]]
* [[Definition:Indemnity trigger]]
* [[Definition:Modeled loss trigger]]
{{Div col end}}

Definition:Index-based trigger - Revision history

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