Introduction To Ratemaking And Loss Reserving For Property And Casualty Insurance _best_ Jun 2026

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Example: For Accident Year 2023, after 12 months you have paid $1M. The average 12→24 month development factor is 1.20. The 24→36 month factor is 1.05. The projected ultimate loss = $1M × 1.20 × 1.05 = $1.26M. Reserve = $1.26M - Amount Paid to Date. AI responses may include mistakes

| Term | Definition | | :--- | :--- | | | Total final amount an insurer will pay for a group of claims. | | Loss Ratio | (Incurred Losses) / (Earned Premiums) – A profitability measure. | | Combined Ratio | Loss Ratio + Expense Ratio. >100% = Underwriting loss. | | Adverse Development | When actual losses turn out higher than reserved amounts. | | Discounting | Reducing reserves to present value (allowed for long-tail lines like workers' comp). | | ALAE (Allocated Loss Adjustment Expense) | Legal, investigation costs directly tied to a specific claim. | The average 12→24 month development factor is 1

The evolution of insurance, risk vs. peril, and what makes a risk insurable. Reserve = $1