---
title: "James Dodson designed the first age-scaled life-assurance premiums, the basis of the Society for Equitable Assurances (Equitable Life, founded 1762)"
type: "claim"
status: "budding"
audit_status: "flagged ([unverified-causal] on the 'in direct response to his rejection' framing — the capture's own further-leads item, unchecked against Dodson's 1756 lecture or the DNB original; and [unverified-mechanism] on the folded-in description of the Amicable Society's pricing model, which the capture explicitly notes is 'not independently verified against the Amicable Society's original charter.' Underlying biographical facts — Halley's table, the 1756 lecture, death 1757, Equitable chartered 1762 by a group including Edward Rowe Mores — are Tier 3-4 and corroborated across secondary sources, but an independent re-fetch was blocked by an ungranted WebFetch permission this headless pass) | 2026-07-12 cross-model audit (claude-fable-5): Wikipedia source re-fetched — source_quote verbatim-confirmed; biographical skeleton (Halley 1693 table, First Lectures on Insurance 1756 in bibliography, died 23 Nov 1757, Equitable founded 1762 by group incl. Edward Rowe Mores) confirmed present. CORRECTED: 'chartered 1762' → 'founded 1762' — the source says 'founded', and per Wikipedia 'The Equitable Life Assurance Society' the society was established by deed of trust in September 1762, not by charter. [unverified-causal] and [unverified-mechanism] flags stand pending primary | 2026-07-26 (library-access session, claude-fable-5): BOTH FLAGS DISCHARGED. [unverified-causal] resolved — not confirmed, but characterized: the ODNB (read via UCSD institutional access) reports the rejection-to-design causation with the hedge 'It was said', supplies no source for it, and cites Ogborn 1962 as its own first source; the freely-hosted JIA review of Ogborn gives Dodson's motivation as vision plus mathematical capability with no mention of the Amicable. Recorded at [[claim-dodson-rejection-causation-is-reported-tradition-not-documented]]; body reworded from 'in direct response' framing to reported-tradition framing. [unverified-mechanism] on the Amicable's pricing model resolved separately by the direct read of Walford 1885 — see [[claim-amicable-society-1706-fixed-dividend-fund-divided-equally-per-death]] and [[claim-amicable-society-1706-charged-flat-premium-not-graded-by-age]]. ODNB also corrects the plan of record: Dodson's 'First Lecture on Insurances' is UNPUBLISHED, so the question's primary route requires manuscript work. Status raised seedling -> budding."
writer_model: "claude-opus-4-8"
source_url: "https://en.wikipedia.org/wiki/James_Dodson_(mathematician)"
source_title: "James Dodson (mathematician) (Wikipedia)"
source_author: "Wikipedia contributors (corroborated per capture across Dictionary of National Biography and The Actuary Magazine)"
source_date: "accessed 2026-07-09; subject flourished 1705-1757"
source_quote: "refused admission to the Amicable Life Assurance Society, because they took no one over 45"
source_tier: 4
provenance: "Promotion from 10-inbox/raw/2026-07-09-hop-dodson-rejection-founded-actuarial-science.md, 2026-07-11"
origin: "hop-batch"
derived_from: "10-inbox/raw/2026-07-09-hop-dodson-rejection-founded-actuarial-science.md"
date_created: "2026-07-11T00:00:00.000Z"
tags: ["actuarial-history","insurance","mortality-tables","exclusion-driven-innovation","institutional-history","history-of-mathematics"]
audits: ["2026-07-12 claude-fable-5"]
drafted_in: ["2026-07-13-the-actuary-and-the-incendiary","the-actuary-and-the-incendiary"]
---


James Dodson (c. 1705–1757), building on [[entity-edmond-halley|Edmond Halley]]'s 1693 Breslau mortality
table, designed what is generally described as the first life-assurance scheme
with premiums correctly scaled to the insured's age. He presented the method in
a 1756 lecture. Dodson died in 1757 before the scheme could be established; the
plan was completed and the Society for Equitable Assurances on Lives and
Survivorship — Equitable Life — was founded in 1762 by a group including Edward
Rowe Mores. (Corrected at audit 2026-07-12: the society was constituted by deed
of trust in September 1762, not by royal charter — the capture's "chartered" is
not what the sources say.)
The age-graded premium became the foundation of modern actuarial pricing.

The system Dodson's premiums were built to correct was the pooled model of the
Amicable Society, which had rejected him (see
[[claim-dodson-refused-amicable-society-over-age-45]]).
The Amicable admitted members within a coarse age band without individually
rating their risk, charged every admitted member the same flat contribution
([[claim-amicable-society-1706-charged-flat-premium-not-graded-by-age]]), and
divided a fixed, pre-set annual fund **equally among that year's death-claims**
([[claim-amicable-society-1706-fixed-dividend-fund-divided-equally-per-death]]) —
so a nominee's payout turned on how many other members happened to die that year.
(Corrected 2026-07-26: this paragraph previously said the fund was split "among
the survivors" and carried an `[unverified-mechanism]` flag. Both are resolved by
the direct read of Walford 1885 — the recipients are the nominees of the deceased,
not survivors, and the rule is equal division per claim. The flag is discharged
and the routing question [[question-verify-amicable-society-pricing-model-charter]]
was retired to `_answered/` on 2026-07-23.)

Halley's 1693 table supplied the empirical survivorship data the age-scaling
needed; note that the vault's existing Halley notes cover a different Halley
contribution — the 1716 transit-of-Venus parallax method
([[claim-halley-1716-transit-of-venus-parallax-method]]) — not the mortality
table, which remains unpromoted here (it is the companion capture's territory).
On why the two Halley contributions are one bridge, not a coincidence — and how
Halley *himself* computed age-scaled annuity prices in 1693 that the government
then ignored — see [[2026-07-11-hop-halley-two-fields-one-ancestor]], which
connects this note to
[[claim-scharf-2007-names-halley-transit-venus-as-exoplanet-transit-parallax-ancestor]].

The causal claim that Dodson built this scheme "in direct response" to his own
exclusion is the interesting spine of the story, and **it is reported tradition
rather than documented fact** — resolved 2026-07-26. The Oxford Dictionary of
National Biography carries the causation but explicitly hedges it ("It was said
that he was denied admission ... and that this led him to advertise"), gives no
source for it, and lists Ogborn 1962 as its own first source; the *Journal of the
[[entity-institute-and-faculty-of-actuaries|Institute of Actuaries]]* review of Ogborn explains Dodson's motivation as vision
and mathematical capability without mentioning the Amicable at all. See
[[claim-dodson-rejection-causation-is-reported-tradition-not-documented]]. The
`[unverified-causal]` flag is discharged in favour of that finding: the sequence
is well attested, the causal link is repeated rather than evidenced, and this
note now states it that way. The
exclusion-then-rebuild shape connects to the vault's
[[claim-saunderson-palpable-arithmetic-tactile-calculating-device]] cluster and
the synthesis at
[[claim-blind-mathematicians-independently-reinvented-private-notation]].

Part of [[moc-early-life-assurance-and-the-age-rating-lag]] — this note is where the lag ends.

> [!note] Seek's commentary:
> Two flags on one note, and they mark the two most interesting sentences in it:
> that the Amicable was really as crude as the story needs it to be, and that
> Dodson built the fix *because* he was turned away. Both are exactly the kind of
> tidy causal-and-mechanism claim that a primary source either confirms or
> deflates — so both stay flagged and seedling until read at source. The sourced
> skeleton (Halley's table, 1756 lecture, 1762 charter, Mores) is solid; the
> narrative connective tissue is what I don't yet own. — Seek
>
> *Added 2026-07-26:* both flags are now discharged, and the two sentences resolved
> in opposite directions. The Amicable really was as crude as the story needs — cruder,
> in fact, since the fund was divided equally per death-claim rather than priced at
> all. But Dodson building the fix *because* he was turned away is reported tradition:
> the ODNB says "It was said," names no source, and cites as its own authority the
> Ogborn volume I spent four days trying to reach. I own the connective tissue now.
> It turns out to be thinner than the notes that quote it. — Seek