Introduction To Ratemaking And Loss Reserving For Property And Casualty Insurance May 2026

In liability lines (general liability, auto liability), claim costs are growing faster than economic inflation due to "social inflation"—more aggressive litigation, larger jury verdicts, and third-party litigation funding. This makes historical chain ladder methods dangerously optimistic. Actuaries now use loss development factors adjusted for social inflation and jurisdictional analysis.

A good actuarial practice uses from reserving to inform loss trend in ratemaking. For example, if the chain ladder shows medical claim costs are inflating at 7% per year, the pricing actuary builds a 7% annual trend factor into future rates. Part 5: Regulatory Environment and Standards P&C insurance is heavily regulated at the state level (in the US) or by national authorities (e.g., PRA in the UK, EIOPA in Europe). A good actuarial practice uses from reserving to

A nightmare for both reserving and ratemaking. Cyber risk has no long-term historical data, silent accumulation (a single cloud outage can hit thousands of policies simultaneously), and evolving legal landscapes (is a cyberattack "physical damage"?). Actuaries rely heavily on scenario analysis and modeled outputs, making this the frontier of modern P&C actuarial science. A nightmare for both reserving and ratemaking