The four-axis ranking
We rank humanity’s most important problems on four quantifiable dimensions — quantity of humans affected, severity per capita, current solution quality, and addressable market size — and package each as a proposal in the spirit of Musk’s Hyperloop Alpha. This document is the proposal for fertility decline & demographic stagnation. Every number below is sourced and tagged with confidence. Every ranking is a conjecture, open to refutation.
Quantity · humans affected
6.0B
highSeverity · WTP / wealth
15%
lowCurrent solutions
1.5 / 10
medMarket size · TAM
$50.0B
lowWhat we are trying to solve
Global fertility has fallen to ~2.3 and is projected to drop below 2.1 (replacement) within a decade. South Korea, Italy, Japan, and China are already at 0.7-1.3. Shrinking working-age populations break pension systems, slow innovation, and collapse housing markets. Causes: housing cost, childcare cost, cultural shift, biological fertility decline. Solutions span policy (childcare subsidies, YIMBY), technology (in-vitro gametogenesis, artificial wombs), and culture. Severely neglected in EA/e/acc canon.
The gap between the world and the world that is physically possible
Today: TFR <2.1 in nearly every developed nation and approaching it in developing ones. Demographic collapse + dependency-ratio crisis baked in for the next 50+ years absent intervention.
Current solution quality is rated 1.5 / 10 (med confidence) — meaning there is substantial unclaimed ground between what exists and what is possible. estimated — TFR continuing to fall in nearly all developed economies; policy responses minimal and largely ineffective.
Who is already working on this
4 entities are currently working on this problem across public markets, private companies, and research orgs. Each is evidence the market is real; none has obviously solved it.
Kindbody
private · USAWomen-focused fertility clinic network, IVF, egg freezing, family planning. Direct-to-employer model.
$1.8B
Gameto
private · USAEngineered ovarian cells to improve IVF and delay menopause. Clinical-stage trials underway.
$300M
Conception
private · USAIn-vitro gametogenesis, generating eggs from stem cells. Directly addresses age-related fertility decline.
undisclosed
Legacy
private · USAAt-home male fertility testing and sperm freezing. Sperm quality has fallen ~50% in 40 years; market lagging.
undisclosed
If we solve this, here is the world we get
After · 30 years
TFR above replacement in most willing societies. Family formation affordable, supported, and culturally celebrated. Demographic stability restored.
Requests for startups · 2 concrete companies to build
Order-of-magnitude cheaper IVF
Assisted reproduction is gated by cost and clinic throughput, not desire. Build the automated fertility lab that drops the cost of a cycle by an order of magnitude.
- why now
- Lab automation + imaging AI can now standardize the most labor-intensive, operator-variable steps of the embryology lab.
- shape
- An automated embryology platform + clinic model that turns a boutique, artisanal process into a standardized, high-throughput one.
- success
- A cycle costs what a used car costs, not what a house down-payment costs, and throughput multiplies.
The cost-of-family-formation attack
Below-replacement fertility is downstream of housing, childcare, and time — not ideology. Build the company that makes the marginal child dramatically cheaper to raise.
- why now
- The bottleneck stack (housing cost, childcare labor, logistics) is now individually attackable with software + operations.
- shape
- An operating company bundling the expensive, time-eating parts of early parenting into a radically cheaper, reliable service — pick the wedge (childcare ops, family housing, logistics) and own it.
- success
- In served markets, the all-in marginal cost of the next child falls enough to move revealed preference.
full rubric + framing on the Requests for Startups page.
What the market can pay
The world is already paying $50.0B per year against this problem (addressable: fertility tech, IVF, childcare, ART, family-formation services (Frost & Sullivan); demographic-collapse cost is GDP-scale but indirect; low confidence).
A successful solution does not need to capture more — it needs to redirect a meaningful slice of existing spend, plus the latent willingness-to-pay implied by the severity score above. The cost ceiling for a real solution is bounded by this number; everything cheaper is dominated, everything more expensive is a non-starter.
What could go wrong, and how we know we are not wrong
Section in progress
Failure modes, ethical considerations, and the conditions under which this whitepaper would be falsified are being authored as the weekly cadence ships. The Deutschian commitment: every claim above is a conjecture; we publish the conditions under which we would update. New whitepaper sections ship with each Monday newsletter drop. Subscribe to get the upgrade, or contribute on GitHub.
Who would back this
Capital allocators with a stated thesis or deployed portfolio in this domain. This is a starting list — Exa Websets enrichment will expand it to direct check-writers per company.
Emergent Ventures
Fast grants. High-variance, unconventional, talent-first.
What the thinkers say
“Population collapse from low birth rates is a larger civilizational risk than most mainstream X-risk. Has stated this repeatedly across years.”
“Demographic stagnation and complacency are under-discussed civilizational risks. Cultural risk aversion compounds into stagnation.”
Where this is wrong, tell us
Every number on this page carries a source and a confidence tag. Every section open to refutation. If a citation is wrong, a number is stale, or a conjecture is unfounded — file a correction.
corrections → use the feedback widget in the nav · open issue at github.com/adamtpang/optimism.fun