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📏 '''Exposure unit''' is the fundamental measure of risk used to calculate [[Definition:Premium | premiums]] in insurance, representing a standardized quantity of the insurable interest to which a [[Definition:Rate | rate]] is applied. The specific unit varies by [[Definition:Line of business | line of business]]: in [[Definition:Workers' compensation insurance | workers' compensation]], it is typically each $100 of [[Definition:Payroll | payroll]]; in [[Definition:General liability insurance | general liability]], it might be revenue, square footage, or number of units; in [[Definition:Personal auto insurance | personal auto]], it is usually the car-year; and in [[Definition:Property insurance | property insurance]], it can be per $100 of [[Definition:Insured value | insured value]]. Whatever form it takes, the exposure unit provides the common denominator that makes [[Definition:Rating | rating]] systematic and comparable across accounts.

🔄 Pricing a policy begins with counting the exposure units associated with the risk and multiplying them by the applicable rate per unit. That rate is itself the product of [[Definition:Actuarial analysis | actuarial analysis]] — [[Definition:Loss cost | loss costs]] developed from historical [[Definition:Claim | claims]] data, loaded with provisions for [[Definition:Expense | expenses]], [[Definition:Profit | profit]], and [[Definition:Contingency | contingencies]]. Because the choice of exposure unit must correlate strongly with loss potential, [[Definition:Actuary | actuaries]] invest considerable effort in selecting units that move in proportion to the hazard being insured. A restaurant's general liability premium keyed to revenue, for example, reflects the assumption that higher revenue implies more customer traffic and therefore more slip-and-fall exposure. When the correlation breaks down — as it can during economic disruptions that change the relationship between revenue and foot traffic — [[Definition:Underwriter | underwriters]] may need to adjust their approach or introduce supplementary rating factors.

📌 Getting the exposure unit right has cascading effects on virtually every downstream function. [[Definition:Loss ratio (L/R) | Loss ratios]], [[Definition:Rate adequacy | rate adequacy]] analyses, and [[Definition:Trending | trend]] studies all depend on a consistent, well-defined unit of measurement; if exposure bases shift or are recorded inconsistently, historical comparisons lose their meaning. For [[Definition:Reinsurer | reinsurers]], understanding the exposure units underpinning a [[Definition:Cession | ceding company's]] portfolio is essential when evaluating treaty pricing. And as new risk categories emerge — [[Definition:Cyber insurance | cyber]], [[Definition:Parametric insurance | parametric weather]], [[Definition:Gig economy insurance | gig economy]] — one of the first actuarial challenges is identifying an exposure unit that meaningfully captures the hazard, a foundational step without which credible pricing cannot begin.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Rate]]
* [[Definition:Loss cost]]
* [[Definition:Premium]]
* [[Definition:Classification code]]
* [[Definition:Actuarial analysis]]
* [[Definition:Rating]]
{{Div col end}}

Definition:Exposure unit - Revision history

PlumBot: Bot: Creating new article from JSON