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📋 '''Premium per unit of exposure''' is a rating metric that expresses the [[Definition:Premium | premium]] charged relative to a standardized measure of the risk being insured, such as per vehicle, per employee, per $1,000 of [[Definition:Sum insured | sum insured]], per square meter of property, or per $1 million of [[Definition:Revenue | revenue]]. In insurance pricing and [[Definition:Actuarial science | actuarial analysis]], this metric functions as a fundamental building block for comparing risk costs, benchmarking [[Definition:Rate adequacy | rate adequacy]], and constructing [[Definition:Rating manual | rating manuals]]. The specific unit of exposure varies by line of business: [[Definition:Workers' compensation insurance | workers' compensation]] typically uses payroll, [[Definition:Commercial auto insurance | commercial auto]] uses vehicle count, [[Definition:Property insurance | property insurance]] uses insured value, and [[Definition:Product liability insurance | product liability]] may use units sold or gross sales.

⚙️ Actuaries calculate premium per unit of exposure by dividing the total premium (or total [[Definition:Loss | losses]], when analyzing loss costs) by the aggregate exposure base for a defined portfolio or rating class. This produces a rate that can be applied uniformly to new risks sharing similar characteristics. For example, a [[Definition:Homeowners insurance | homeowners]] insurer might determine that the premium per $1,000 of dwelling coverage in a given territory is $3.50, reflecting the portfolio's [[Definition:Loss experience | loss experience]], [[Definition:Expense ratio | expense loading]], and targeted [[Definition:Profit margin | profit margin]]. The metric also underpins [[Definition:Experience rating | experience rating]] and [[Definition:Prospective rating | prospective rating]] plans, where an individual account's exposure units are multiplied by the manual rate, then adjusted for the account's own claims history. Regulatory filings in jurisdictions like the United States — where [[Definition:Rate filing | rate filings]] are submitted to state [[Definition:Department of insurance | departments of insurance]] — and in Solvency II markets often require insurers to demonstrate that their premium per unit of exposure is actuarially justified.

💡 Tracking this metric over time gives [[Definition:Underwriter | underwriters]], portfolio managers, and reinsurers a clear lens into whether rates are keeping pace with evolving loss trends. A declining premium per unit of exposure in the face of rising [[Definition:Claims frequency | claims frequency]] or [[Definition:Claims severity | severity]] signals a [[Definition:Soft market | soft market]] condition or underpricing that may erode [[Definition:Underwriting profit | underwriting profitability]]. Conversely, sharp increases may indicate a [[Definition:Hard market | hard market]] correction or changes in the underlying risk profile. [[Definition:Insurtech | Insurtech]] firms increasingly leverage granular exposure data — telematics for auto, IoT sensors for property, real-time payroll feeds for workers' compensation — to refine exposure measurement and produce more precise per-unit pricing. Across global markets, harmonizing exposure definitions is a persistent challenge: what constitutes "one unit" in a Japanese earthquake portfolio may differ from the exposure metric used by a European or North American insurer, complicating cross-border [[Definition:Reinsurance | reinsurance]] placement and [[Definition:Benchmarking | benchmarking]].

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Exposure base]]
* [[Definition:Rate adequacy]]
* [[Definition:Loss cost]]
* [[Definition:Experience rating]]
* [[Definition:Manual rate]]
* [[Definition:Actuarial pricing]]
{{Div col end}}

Definition:Premium per unit of exposure - Revision history

PlumBot: Bot: Creating new article from JSON