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💲 '''Price effect''' in the insurance context isolates the portion of change in [[Definition:Gross written premium (GWP) | written premium]] volume or [[Definition:Loss ratio | loss experience]] attributable to shifts in the [[Definition:Premium rate | rate]] charged per unit of exposure, as opposed to changes in the number of policies sold, the mix of business, or the severity of [[Definition:Claims | claims]]. When an insurer reports that its top line grew by a certain percentage, the price effect quantifies how much of that growth came from [[Definition:Rate adequacy | rate increases]] on renewals and new business versus organic volume expansion. The concept is used extensively in [[Definition:Non-life insurance | non-life insurance]] — property, casualty, and specialty lines — where [[Definition:Underwriting cycle | underwriting cycle]] dynamics drive periodic swings between [[Definition:Hard market | hard]] and [[Definition:Soft market | soft market]] pricing.

⚙️ Insurers and [[Definition:Reinsurance | reinsurers]] decompose premium movements into several components to understand underlying growth dynamics: price effect, volume effect (changes in exposure count or insured values), and mix effect (shifts in the composition of the portfolio across lines, geographies, or risk profiles). Actuarial and finance teams typically measure price effect by comparing the rate applied to a like-for-like exposure at renewal against the expiring rate, aggregating these rate changes across the book. Some companies further distinguish between "pure" rate change and changes in [[Definition:Terms and conditions | terms and conditions]] — such as higher [[Definition:Deductible | deductibles]] or narrower coverage — which effectively function as hidden price increases. Market data providers and broking firms such as [[Definition:Marsh | Marsh]], [[Definition:Aon | Aon]], and [[Definition:Guy Carpenter | Guy Carpenter]] publish composite price indices that track the aggregate price effect across commercial lines, providing benchmarks against which individual insurer results can be assessed.

💡 Accurately identifying the price effect is essential for distinguishing between genuine underwriting improvement and growth that merely reflects a rising-rate environment. During a [[Definition:Hard market | hard market]], an insurer's premium growth may look impressive, but if most of the increase stems from price rather than new risk acquisition, the growth may not be durable once the cycle turns. Conversely, in a [[Definition:Soft market | softening market]], a company that holds rate while competitors discount is sacrificing near-term volume for longer-term [[Definition:Underwriting profit | underwriting profitability]] — a trade-off visible only when price and volume effects are separated. For investors and management alike, the price effect also feeds directly into [[Definition:Reserving | reserve adequacy]] assessments: if earned premium growth is driven primarily by rate increases, actuaries can expect those higher rates to improve future [[Definition:Loss ratio | loss ratios]], all else being equal, informing both [[Definition:Incurred but not reported (IBNR) | IBNR]] estimates and forward-looking profitability projections.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Underwriting cycle]]
* [[Definition:Rate adequacy]]
* [[Definition:Hard market]]
* [[Definition:Soft market]]
* [[Definition:Loss ratio]]
* [[Definition:Gross written premium (GWP)]]
{{Div col end}}

Definition:Price effect - Revision history

PlumBot: Bot: Creating new article from JSON