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📊 '''Rate on line (RoL)''' is a pricing metric used primarily in [[Definition:Reinsurance | reinsurance]] and [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] markets that expresses the [[Definition:Reinsurance premium | reinsurance premium]] as a percentage of the [[Definition:Policy limit | limit of liability]] provided by a particular layer. If a reinsurer charges a $5 million premium for $50 million of [[Definition:Excess of loss reinsurance | excess-of-loss]] cover, the rate on line is 10%. The metric offers a quick, standardized way to compare the relative cost of protection across different layers, perils, and market cycles — making it one of the most commonly quoted figures in property [[Definition:Catastrophe reinsurance | catastrophe reinsurance]] negotiations.

🔢 Calculating RoL is straightforward: divide the premium for a given layer by that layer's limit and multiply by 100. What makes the metric analytically powerful, however, is its inverse relationship to the [[Definition:Payback period | payback period]] — a 10% RoL implies that the reinsurer would need ten loss-free years of premium to recoup a full limit loss, while a 5% RoL implies twenty years. Market participants use RoL trends to gauge pricing adequacy and the broader reinsurance cycle: rising RoLs after major [[Definition:Catastrophe loss | catastrophe losses]] signal a hardening market, while declining RoLs in benign years indicate softening. The metric is most intuitive for [[Definition:Per-occurrence excess of loss | per-occurrence excess-of-loss]] covers and [[Definition:Catastrophe bond | catastrophe bonds]], where the limit is clearly defined. It is less commonly applied to [[Definition:Proportional reinsurance | proportional treaties]] such as [[Definition:Quota share | quota shares]], where premium and limit move in tandem rather than being independently negotiated. Across markets — from the January renewal season for global [[Definition:Property catastrophe reinsurance | property catastrophe]] programmes to mid-year renewals in Japan and Australia — RoL movements are tracked by brokers, reinsurers, and analysts as a barometer of supply-and-demand dynamics.

💡 For [[Definition:Cedent | cedents]] purchasing reinsurance, RoL is an essential input for evaluating whether protection at a given [[Definition:Attachment point | attachment point]] offers value relative to the modelled expected loss and the cost of retaining the risk. A cedent comparing two excess layers can use RoL alongside [[Definition:Expected loss ratio | expected loss ratios]] and [[Definition:Risk-adjusted return | risk-adjusted return]] benchmarks to allocate its reinsurance budget efficiently. For reinsurers, tracking portfolio-weighted RoLs across vintages reveals whether aggregate pricing is keeping pace with evolving [[Definition:Catastrophe risk | catastrophe risk]] — a question that has grown more urgent as [[Definition:Climate change | climate change]] and [[Definition:Loss trend | loss trends]] challenge historical assumptions. RoL data published by major [[Definition:Reinsurance broker | reinsurance brokers]] in their renewal reports has become a foundational dataset for the broader market, influencing capital allocation decisions by [[Definition:Institutional investor | institutional investors]] in ILS funds and [[Definition:Collateralized reinsurance | collateralized reinsurance]] vehicles worldwide.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Attachment point]]
* [[Definition:Catastrophe reinsurance]]
* [[Definition:Expected loss ratio]]
* [[Definition:Payback period]]
* [[Definition:Insurance-linked securities (ILS)]]
{{Div col end}}

Definition:Rate on line (RoL) - Revision history

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