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📉 '''Erosion''' in insurance terminology describes the gradual reduction of available [[Definition:Policy limit | policy limits]] or [[Definition:Aggregate limit | aggregate coverage]] as [[Definition:Claims | claims]] are paid or reserved against a [[Definition:Layer (insurance) | layer]] of coverage. The concept is particularly significant in [[Definition:Liability insurance | liability]], [[Definition:Professional indemnity insurance | professional indemnity]], and [[Definition:Directors and officers insurance (D&O) | directors and officers (D&O)]] programs, where multiple claims within a single policy period can progressively consume the total limit, leaving less capacity for subsequent losses. Unlike property lines where each occurrence typically triggers its own per-occurrence limit, many liability and financial-lines policies feature a single [[Definition:Aggregate limit | aggregate]] that erodes with every dollar spent on defense costs, settlements, or judgments.

🔍 The mechanics hinge on whether defense costs sit inside or outside the limit. In policies where defense costs erode the limit — a common structure in D&O and [[Definition:Errors and omissions insurance (E&O) | errors and omissions (E&O)]] placements — legal fees alone can substantially diminish the coverage available for an eventual settlement or verdict. [[Definition:Excess insurance | Excess]] and [[Definition:Umbrella insurance | umbrella]] layers are also subject to erosion when the [[Definition:Primary insurance | primary]] layer beneath them is gradually eaten away; once the primary limit is fully exhausted, the excess layer ''drops down'' and begins to respond. [[Definition:Broker | Brokers]] structure [[Definition:Insurance program | tower programs]] with erosion dynamics in mind, carefully modeling how multiple claims in a high-frequency year could cascade through successive layers.

⚠️ Understanding erosion is indispensable for [[Definition:Risk manager | risk managers]] and [[Definition:Underwriter | underwriters]] alike, because miscalculating it can leave an organization dangerously underinsured midway through a policy term. A company facing serial [[Definition:Litigation | litigation]] — such as a financial institution dealing with multiple regulatory actions — may find its coverage materially eroded before the most consequential claim is even resolved. Sophisticated buyers address this by purchasing [[Definition:Reinstatement | reinstatement]] provisions, stacking additional [[Definition:Side A insurance | Side A]] or dedicated layers, or negotiating ''non-eroding'' sub-limits for specific exposures. For carriers, accurate erosion modeling feeds directly into [[Definition:Reserving | reserving]] and [[Definition:Pricing | pricing]] adequacy across the portfolio.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Aggregate limit]]
* [[Definition:Policy limit]]
* [[Definition:Defense costs]]
* [[Definition:Excess insurance]]
* [[Definition:Reinstatement]]
* [[Definition:Directors and officers insurance (D&O)]]
{{Div col end}}

Definition:Erosion - Revision history

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