The endowment model

Permanent capital for open-access reference work that should outlive a grant cycle

Precedent

This already exists at small scale

The Stanford Encyclopedia of Philosophy has been a standard open philosophy reference since 1995: free to read, peer-reviewed, regularly updated. Operating cost is about $214,000 per year, supported by a roughly $4.1 million endowment. A small paid staff coordinates more than a thousand volunteer authors. That is an operating fact, not a pitch deck.

$214K
Annual operating cost of the Stanford Encyclopedia of Philosophy — the world's most authoritative open-access philosophy reference
$4.1M
Endowment principal that funds it permanently — raised from one university and 600 libraries worldwide
1,500+
Volunteer academics who write and maintain entries — contributing because the platform is credentialed, rigorous, and prestigious

Who tends to care first

Institutions with strength that does not show up as a brand headline

Early conversations with administrators split in a predictable way. Very top-ranked brands were often cautious: they already get attention when they publish. Strong academic institutions just outside that short list — deep in a few fields, less visible in the public reference layer — more often saw a clear use for their own encyclopedia.

That is not a slight at anyone. If a unit already commands global attention, a new platform is optional. If LSE, Edinburgh, Leiden, Padua, a national academy, or a research institute wants their work read as their work — not as a paragraph inside a general encyclopedia — an institution-run reference is a practical way to do that.

Scale of spend, relative to permanent capital

A $100 million endowment can support a substantial open-access encyclopedia in perpetuity at a 5% payout. For a multi-billion-dollar institutional endowment, that is a small fraction of assets — closer to a named facility than to a new school. Whether it is “worth it” depends on whether permanent open reference in the institution’s real strengths is a priority. The numbers make the ask size concrete; they do not decide the strategy.

How endowments work

Permanent Capital, Permanent Knowledge

An institutional endowment is not a budget line. The principal is never spent — it is invested permanently, and only the annual returns flow to operations. At the standard 5% annual payout rate, a gift given today funds operations indefinitely, adjusting with inflation over time. This is why endowments are the correct funding model for knowledge infrastructure: they align the time horizon of the money with the time horizon of the work.

Advertising-funded knowledge serves advertisers. Subscription-funded knowledge serves subscribers. Endowment-funded knowledge serves no one but the mission. The Stanford Encyclopedia of Philosophy carries no advertisements, charges no fees, and answers to no commercial interest — because the people who funded it gave capital, not a contract.

The numbers

What It Costs to Build One

At a 5% annual payout, the formula is simple: divide the desired annual operating budget by 0.05 to find the required endowment principal. Below are four realistic tiers for a single-institution encyclopedia.

Tier Annual Budget Endowment Needed What You Get
Proof of concept $500K – $1M $10M – $20M 3–8 editorial staff, volunteer-authored entries in 1–2 disciplines, institution-hosted platform. The SEP model applied to a new subject area.
Credible flagship $3M – $5M $60M – $100M 20–40 staff across editorial, engineering, and outreach. 5,000–20,000 peer-reviewed entries. Full-featured platform with search, versioning, and APIs. Open access.
Comprehensive $5M – $10M $100M – $200M 40–80 staff. Multi-discipline coverage matching the institution's full range of expertise. Multilingual publishing, active entry commissioning, integration with library databases.
Network infrastructure $10M – $20M $200M – $400M Cross-institutional coordination layer, shared technology platform, editorial standards body, and support for smaller institutions joining the network. arXiv-scale with editorial depth.

Based on comparable projects: Stanford Encyclopedia of Philosophy ($214K/year, $4.1M endowment), arXiv ($6M/year, 27 staff), and Wikimedia Foundation ($178.5M/year covering 300+ language editions globally). Salary assumptions reflect U.S. academic editorial labor markets. Technology costs assume open-source platform stack (MediaWiki or equivalent). Sources: NACUBO FY2024, Wikimedia audited financials FY2024, arXiv FY2024 budget, Ithaka S+R SEP case study.

Editorial Staff

40–60% of any encyclopedia budget goes to people. A credible $5M/year operation supports 25–40 staff: an editor-in-chief, managing editors per discipline, editorial assistants, and a small platform engineering team. Volunteer academics write the entries; paid staff coordinate, commission, and review.

Technology Platform

20–35% covers platform build and maintenance — typically $500K–$2M one-time, then $300K–$800K/year ongoing. This includes hosting, search infrastructure, version control, contribution workflows, and APIs. An open-source stack (MediaWiki, custom CMS) substantially reduces cost.

Peer Review Infrastructure

Academic rigor is the differentiator. Software for managing submissions, revisions, and editorial decisions runs $20K–$100K/year. Modest reviewer honoraria — $100–$500 per entry — incentivize participation without replacing the intrinsic motivation that drives academic voluntarism.

Operations & Governance

Legal, compliance, accounting, and administration typically run 12–15% of nonprofit budgets. For an endowed fund within an academic institution, much of this overhead is absorbed by the host — often at a negotiated rate of 6–12% rather than the commercial standard.

Establishing an endowment

How institutions actually do this

The SEP endowment was built in three phases over roughly a decade: a challenge grant from the National Endowment for the Humanities ($500K, conditional on matching funds), a lead gift from private Stanford donors ($1.125M), and a global library consortium campaign — the Scholarly Publishing and Academic Resources Coalition for the SEP (SEPIA) — through which over 600 libraries contributed amounts as small as $100 each to collectively raise $3M.

The same architecture applies at larger scale. An encyclopedia initiative typically begins with an anchor donor or institutional commitment (12–24 months), a library consortium or member-institution campaign (18–36 months), and ongoing faculty, alumni, members, and named-fund contributions. State matching programs — Kentucky's Bucks for Brains, Texas TRIP, and others — can double private gifts. Foundation co-investment from Mellon, Simons, or MacArthur has seeded every major academic knowledge project of the past thirty years.

A realistic path from concept to an operating endowment is on the order of 3–5 years. Once funded, the principal stays invested and operations continue as long as governance holds. Timing and fit are institutional decisions; the model is here so those decisions can be costed.

Costing a pilot

We talk with academic institutions interested in early endowed encyclopedias. Administrators, development officers, and scholars can write with questions about structure, budget tiers, or fit.

Project aim

Mission

Questions or updates

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