Chapter 11 — Further Reading

Sources are grouped by the book's three citation tiers (see the front matter on how we cite). Tier 1 is verified canonical material you can stand behind; Tier 2 is real, attributed practice whose exact figures we do not pin down here; Tier 3 is the chapter's own constructed teaching material. Annotations point you to what each source is good for, not just that it exists.

If you read only one thing: read the ratemaking standard as expressed in the NAIC model rating laws and your own state's rating statute — the three words inadequate, excessive, unfairly discriminatory. Everything in this chapter is, in the end, an elaboration of how an underwriter builds a rate that satisfies those three words. Pair it with the ratemaking chapters of a CAS (Casualty Actuarial Society) or The Institutes text to see the same standard from the actuary's side.

Tier 1 — Verified canonical

  • NAIC model rating laws and the standard "inadequate, excessive, or unfairly discriminatory." The National Association of Insurance Commissioners maintains the model laws that most states adapt for rate regulation. This is the legal frame for every rate in the chapter; read it alongside your own state's rate-filing statute (prior-approval, file-and-use, or use-and-file — Chapter 4).
  • The McCarran-Ferguson Act (1945). Establishes that insurance is regulated primarily by the states — which is why rates are filed with and approved by state insurance departments rather than a federal agency. The foundation for the Compliance Corner in §11.2 and §11.5. (Owned by Chapter 4.)
  • ISO / Verisk as the advisory organization for property-casualty loss costs, and NCCI (the National Council on Compensation Insurance) for workers'-compensation loss costs and the experience-rating (X-mod) plan. These are the real institutions behind §11.2's loss-cost-to-rate machinery and §11.4's experience rating. Their published manuals and ratemaking methodologies are the canonical reference for how loss costs are developed and filed.
  • AM Best ratings and the public record of insurer insolvencies and downgrades. Best's impairment studies and rating reports document, over decades, the recurring link between rate inadequacy, reserve deficiency, and failure that Case Study 2's composite is built from. (Owned by Chapter 3.)
  • The U.S. property-casualty underwriting cycle, including the well-documented soft market of the late 1990s and the hard market of 2001–2002 (amplified by the September 11 attacks). A Tier-1 economic-history reference point for §11.7 and Case Study 1; use the public, qualitative pattern, not any invented statistic.

Tier 2 — Attributed, specifics unverified

  • Ratemaking and loss-reserving texts from The Institutes (CPCU/AINS/AU curriculum) and the Casualty Actuarial Society (CAS). These develop the pure-premium and loss-ratio ratemaking methods, the expense-loading and permissible-loss-ratio mechanics, and experience- and retrospective-rating formulas in full technical detail. Attributed as the standard professional treatment; consult the current editions for the exact formulas and worked examples that go beyond this chapter's intuition-level coverage.
  • Industry commentary on soft-market schedule-credit drift and "cash-flow underwriting." Trade press and practitioner literature have long described how discretionary credits and competitive pressure erode rate adequacy in soft markets (the §11.5 and §11.7 trap). Attributed as a real and repeatedly observed industry pattern; we do not attach a specific figure to it.
  • Rating-agency and regulatory post-mortems on rate-inadequacy insolvencies. Beyond AM Best, state insurance-department liquidation reports and academic studies of P&C insurer failures repeatedly identify rapid growth, inadequate pricing, and adverse reserve development as the failure pattern. Attributed as the documented general pattern underlying Case Study 2's composite.

Tier 3 — Illustrative / constructed (this book)

  • The Harbor Steel & Fabrication file. The constructed metal-fabrication account whose property rate is built and modified across §11.1–§11.7 and in The Underwriting File. All of its rates, relativities, schedule modifications, and the indicated debit-rated premium are illustrative teaching numbers.
  • The premium build-up, loss-cost-to-rate, rating-factor, experience-rating, schedule-rating, and retrospective-rating diagrams in this chapter. Every dollar figure, factor, and percentage in them is a constructed example chosen to make the mechanics legible, not a market rate.
  • "Cardinal Mutual Casualty" (Case Study 2). A clearly-labeled composite carrier built from the real, recurring rate-inadequacy-insolvency pattern; all of its particulars are constructed.

Where to go next in this book

  • Chapter 10 for the pure premium, the loss ratio, credibility, and trend and development — the inputs this chapter builds a price from.
  • Chapter 12 for the terms (deductibles, limits, sublimits, endorsements) that turn the indicated rate into a workable deal — the immediate sequel.
  • Chapter 22 for the workers'-compensation X-mod, the fullest worked example of experience rating.
  • Chapter 32 for the GLM and machine-learning models that do, continuously and at scale, what the manual rating plan in §11.3 does by table — and inherit all the same questions about relativities and fairness.
  • Chapter 35 for where risk-based pricing becomes unfair discrimination, and Chapter 28 for the cost of capital that the profit load (§11.1) is meant to earn.